Wake-modifying device for a boat

Abstract

A recreational sport boat includes a hull having starboard and port sides and a transom, a generally horizontal platform, and a pair of wake-modifying devices positioned aft of the transom. The generally horizontal platform extends aft of the transom and is configured to support a human weighing at least 100 lbs. on an upper surface thereof. The pair of wake-modifying devices are attached to the platform. One of the wake-modifying devices is positioned on a port side of the platform's centerline, and another of the wake-modifying devices is positioned on a starboard side of the platform's centerline. Each wake-modifying device is moveable between a non-deployed position and a deployed position in which the wake-modifying device is angled downwardly at an angle relative to the top surface of the generally horizontal platform.

Description

FIELD OF THE INVENTION

The invention relates to a device for modifying the wake of a boat, as well as a boat equipped with one or more such devices.

BACKGROUND OF THE INVENTION

Recreational sport boats are often used to tow water sports performers such as water skiers, wakeboarders, wake surfers, and the like. These boats often have a horizontal platform attached to the transom of the boat to make it easier for the performer to get into the water from the boat or out of the water into the boat. This platform is commonly referred to as a swim platform or a boarding platform.

The optimal wake depends on the water sport a boat is used for, as well as the preferences and skill level of the performer. Water skiers generally prefer a relatively smooth water surface, while wakeboarders and wake surfers desire bigger wakes and wakes with more defined shapes. In recent years, boats have been equipped with various means for modifying the wake of the boat depending on how the boat is being used.

One example of a conventional means used to modify a boat's wake is a trim tab. Trim tabs originally were designed to adjust the trim of a boat. For example, when a boat is overloaded on the port side causing the boat to list to port, a trim tab may be deployed on the port side to cause the boat to return to an even keel. More recently, trim tabs have been used to purposefully modify the wake of a boat. One way to do so is to use one or more trim tabs to lift the stern of the boat. Lifting the stern minimizes the wake of a boat, resulting in a relatively smooth water surface, which is desirable for water skiing. Another way that trim tabs have been used is to increase the displacement of one side of the boat, which increases the size of the wake on the side of the boat with the increased displacement.

FIG. 1 shows the transom 122 of a boat used to tow a water sports performer. Three trim tabs 10, 20, 30 known in the art are mounted on the transom 122: one on the port side, one at the centerline, and one on the starboard side. Each tab is pivotably attached to the transom 122 of the boat by a hinge 11, 21, 31. The port and starboard trim tabs 10, 30 are flat plates, with inboard and outboard edges bent upwards at a 90° angle. The upwardly-extending portion of each tab extends approximately ¼ inch above the upper surface of the flat portion of the tabs. The center trim tab 20 also is a flat plate, with inboard and outboard edges bent downwards at a 90° angle and a trailing edge bent upwards at a 90° angle. The downwardly-extending portions of the center tab extend approximately ⅛ inch below the lower surface of the flat portion of the tab, and the upwardly-extending portion extends approximately ¼ inch above the upper surface of the flat portion. The edges of the trim tabs 10, 20, 30 are bent upwards or downwards to aid in the manufacturing process and the extent to which the edges extend upwards or downwards is preferably minimized.

Each of the aforementioned trim tabs 10, 20, 30 is pivotable between a non-deployed position and a deployed position. In FIG. 1, the port trim tab 10 is shown in a deployed position and the starboard trim tab 30 is shown in a non-deployed position. A linear actuator 510 moves each tab between the non-deployed position and the deployed position. As the boat moves through the water, the water flowing under the boat impinges on the deployed trim tab, creating an upward force on the tab. As a result, the portion of the boat where the trim tab is attached is raised. When used for water skiing, the center tab 20 may be deployed to raise the entire stern of the boat and minimize the wake. To increase the wake of the boat for wake surfing, either one of the port or starboard trim tabs may be deployed. When the port trim tab 10 is deployed, for example, the port side of the boat is raised, causing an increase in displacement on the starboard side of the boat, which increases the size of the starboard wake. The side of the boat with the increased wake is the surf side, which, in this example, is the starboard side. To further increase the size of the wake, ballast may also be added to the surf side of the boat.

In the embodiment shown in FIGS. 1 and 2, the port and starboard trim tabs 10, 30 are not perfectly rectangular, but rather have an angled contour along their outboard edges. This is so that the trim tabs do not extend beyond the outer perimeter of a swim platform (not shown) mounted to the transom 122 of the boat, above the trim tabs 10, 20, 30. Alternatively, all of the trim tabs may have a rectangular shape.

Even with the trim tabs described above, wakeboarders and wake surfers desire larger wakes with improved shapes. For surfing in particular, wake surfers desire a wake with a large surfable area. The surfable area is the portion of the wake that pushes the surfer forward. This area generally extends from the curl of the wake to the swim platform.

SUMMARY OF THE INVENTION

In one aspect, the invention relates to a wake-modifying device adapted to be attached to a boat, aft of the boat's transom, on either a port or starboard side of the boat's centerline.

In another aspect, the invention relates to a recreational sport boat including a hull, having starboard and port sides and a transom, and a pair of wake-modifying devices positioned aft of the transom. One of the wake-modifying devices is positioned on a port side of the boat's centerline and another of the wake-modifying devices is positioned on a starboard side of the boat's centerline. Preferably, each wake-modifying device is pivotably attached directly to the transom. Alternatively, one or both of the wake-modifying devices may be attached to other portions of the boat, such as the bottom or sides of the hull or a generally horizontal platform.

In a further aspect of the invention, each wake-modifying device includes a plate-like member and at least one downturned surface at a trailing portion of the plate-like member. Each wake-modifying device is pivotable between a non-deployed position and a deployed position about a pivot axis that is horizontal or inclined no more than about 35° from horizontal. In the deployed position, the downturned surface is lower than it is in the non-deployed position so as to be able to modify the boat's wake.

The plate-like member and the downturned surface of each wake-modifying device may be an integral piece or separate pieces joined together. The downturned surface may be at a trailing edge of the plate-like member, for example, when they are an integral piece. Or the downturned surface may be inward of the trailing edge, for example, when the downturned surface is a separate piece attached to a lower surface of the plate-like member.

Preferably, an angle between the downturned surface of each wake-modifying device and a lower surface of a central portion of the plate-like member is between about 120° to about 135°, and the downturned surface extends between about 1 inch to about 2¼ inches below the lower surface of the plate-like member. The downturned surface may be oriented such that it intersects the plate-like member along a line that is generally parallel to the pivot axis, or along a line that is at an oblique angle relative to the pivot axis. The downturned surface and the plate-like member need not intersect along a straight line, and may instead intersect along a curved line.

Preferably, each wake-modifying device includes not one but two (or more) downturned surfaces at a trailing portion of the plate-like member. A first one of the downturned surfaces may intersect the plate-like member along a line that is generally parallel to the pivot axis, and a second one of the downturned surfaces may intersect the plate-like member along a line that is at an obtuse angle relative to the line along which the first downturned surface and the plate-like member intersect. Preferably, the obtuse angle is between about 135° to about 150°, and the first downturned surface is outboard of the second downturned surface.

Each wake-modifying device may also include at least one upturned surface at an outboard portion of the plate-like member, between the downturned surface and the pivot axis. The plate-like member and the upturned surface may be an integral piece or separate pieces joined together, and the upturned surface may be at an outboard edge of the plate-like member or inward of the outboard edge. An angle between the upturned surface and an upper surface of a central portion of the plate-like member preferably is between about 30° to about 150°, and more preferably is about 90°. The upturned surface preferably extends at least about 1 inch above an upper surface of the plate-like member.

At least one of the wake-modifying devices may include another downturned surface at an inboard portion of the plate-like member, between the first downturned surface and the pivot axis. An angle between this downturned surface and the lower surface of a central portion of the plate-like member preferably is between about 30° to about 150°, and more preferably is about 90°. The plate-like member and this downturned surface may be an integral piece or separate pieces joined together, and the downturned surface may be at an inboard edge of the plate-like member or inward of the inboard edge.

At least one of the wake-modifying devices may also include at least one fin attached to the lower surface of the plate-like member. An angle between the fin and the lower surface of the plate-like member preferably is between about 30° to about 150°, and more preferably is about 90°. The fin preferably extends at least about 1 inch below the lower surface of the plate-like member. The fin and the plate-like member preferably intersect along a line that is at an angle between about 15° and about 75° relative to the pivot axis, and more preferably between about 30° and about 60° relative to the pivot axis, and extends in a direction aft and outboard from the pivot axis. In some cases, it may be desirable to have at least two fins, which preferably are parallel to each other.

In still a further aspect, the invention relates to a recreational sport boat. The boat includes a hull having starboard and port sides and a transom. The boat also includes a generally horizontal platform extending aft of the transom and configured to support a human weighing at least 100 lbs. on an upper surface thereof. In this aspect of the invention, a pair of wake-modifying devices are pivotably attached to the platform. One of the wake-modifying devices is positioned on a port side of the platform's centerline, and another of the wake-modifying devices is positioned on a starboard side of the platform's centerline. Preferably, each wake-modifying device is pivotable between a non-deployed position in which the wake-modifying device is oriented generally parallel to the platform and a deployed position in which the wake-modifying device is pivoted downwardly at an angle relative to its non-deployed position.

In still another aspect, each wake-modifying device attached to the platform is moveable between a non-deployed position and a deployed position in which the wake-modifying device is angled downwardly at an angle relative to the top surface of the generally horizontal platform. In this aspect of the invention, a pair of wake-modifying devices are pivotably attached to the platform.

The aspects of the invention are not mutually exclusive. Instead various aspects of the invention may be used in combination with other aspects of the invention or other means to modify the boat's wake. For example, in yet another aspect, the invention relates to a recreational sport boat. The boat includes a hull having starboard and port sides and a transom. The boat also includes a generally horizontal platform extending aft of the transom and configured to support a human weighing at least 100 lbs. on an upper surface thereof. In this aspect of the invention, a first pair of wake-modifying devices is preferably attached to the transom with one of the wake-modifying devices positioned on a port side of the boat's centerline and another of the wake-modifying devices positioned on a starboard side of the boat's centerline. A second pair of wake-modifying devices is preferably attached to the underside of the generally horizontal platform with one of the wake-modifying devices positioned on a port side of the platform's centerline, and another of the wake-modifying devices positioned on a starboard side of the platform's centerline.

Each wake-modifying device preferably is capable of assuming multiple deployed positions. In each different deployed position the wake-modifying device is pivoted downwardly at a different angle relative to the non-deployed position. The boat may include a plurality of linear actuators, each operable to move a respective one of the wake-modifying devices between its non-deployed position and its deployed position. The boat also preferably includes an operator station with a controller configured to control the operation of each linear actuator.

These and other aspects of the invention are further described and illustrated in the following description and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a transom of a boat equipped with prior art trim tabs.

FIG. 2 is a detailed view the starboard trim tab shown in FIG. 1.

FIG. 3 shows a boat including a pair of wake-modifying devices according to a first preferred embodiment of the invention.

FIG. 4 is a stern view of the boat shown in FIG. 3.

FIG. 5 is a detailed view of the port wake-modifying device shown in FIG. 3.

FIG. 6 is a detailed view of the bottom of the port wake-modifying device shown in FIG. 3.

FIG. 7 is a perspective view of the port wake-modifying device shown in FIG. 3, detached from the boat and shown here from the inboard side.

FIG. 8 is a perspective view of the port wake-modifying device shown in FIG. 7, shown here from the outboard side.

FIG. 9 is a perspective view of the port wake-modifying device shown in FIG. 7, turned upside down and shown here from the outboard side.

FIG. 10 is an outboard elevation view of the port wake-modifying device shown in FIG. 7.

FIG. 11 is an inboard elevation view of the port wake-modifying device shown in FIG. 7.

FIG. 12 is an aft elevation view of the port wake-modifying device shown in FIG. 7.

FIG. 13 is a top elevation view of the port wake-modifying device shown in FIG. 7.

FIG. 14 is a foreside elevation view of the port wake-modifying device shown in FIG. 7.

FIG. 15 is a bottom elevation view of the port wake-modifying device shown in FIG. 7.

FIG. 16 is a port side view of the boat shown in FIG. 3, with the port wake-modifying device in a non-deployed position.

FIG. 17 is a port side view of the boat shown in FIG. 3, with the port wake-modifying device in a deployed position.

FIG. 18 is a manufacturing view of the port wake-modifying device shown in FIG. 7.

FIG. 19 is a perspective view of the starboard wake-modifying device shown in FIG. 3, detached from the boat and shown here from the outboard side.

FIG. 20 is a perspective view of the starboard wake-modifying device shown in FIG. 19, shown here from the inboard side.

FIG. 21 is a perspective view of the starboard wake-modifying device shown in FIG. 19, turned upside down and shown here from the outboard side.

FIG. 22 is an inboard elevation view of the starboard wake-modifying device shown in FIG. 19.

FIG. 23 is an outboard elevation view of the starboard wake-modifying device shown in FIG. 19.

FIG. 24 is an aft elevation view of the starboard wake-modifying device shown in FIG. 19.

FIG. 25 is a top elevation view of the starboard wake-modifying device shown in FIG. 19.

FIG. 26 is a foreside elevation view of the starboard wake-modifying device shown in FIG. 19.

FIG. 27 is a bottom elevation view of the starboard wake-modifying device shown in FIG. 19.

FIG. 28 is a starboard side view of the boat shown in FIG. 3, with the starboard wake-modifying device in a non-deployed position.

FIG. 29 is a starboard side view of the boat shown in FIG. 3, with the starboard wake-modifying device in a deployed position.

FIG. 30 is a manufacturing view of the starboard wake-modifying device shown in FIG. 19.

FIG. 31 is a stern view of a boat including a pair of wake-modifying devices according to a second preferred embodiment of the invention.

FIG. 32 is a detailed view of the port wake-modifying device shown in FIG. 31.

FIG. 33 is a detailed view of the bottom of the port wake-modifying device shown in FIG. 31.

FIG. 34 is a perspective view of the port wake-modifying device shown in FIG. 31, detached from the boat and shown here from the inboard side.

FIG. 35 is a perspective view of the port wake-modifying device shown in FIG. 34, shown here from the outboard side.

FIG. 36 is a perspective view of the port wake-modifying device shown in FIG. 34, turned upside down and shown here from the outboard side.

FIG. 37 is an outboard elevation view of the port wake-modifying device shown in FIG. 34.

FIG. 38 is an inboard elevation view of the port wake-modifying device shown in FIG. 34.

FIG. 39 is an aft elevation view of the port wake-modifying device shown in FIG. 34.

FIG. 40 is a top elevation view of the port wake-modifying device shown in FIG. 34.

FIG. 41 is a foreside elevation view of the port wake-modifying device shown in FIG. 34.

FIG. 42 is a bottom elevation view of the port wake-modifying device shown in FIG. 34.

FIG. 43 is a port side view of the boat shown in FIG. 31, with the port wake-modifying device in a non-deployed position.

FIG. 44 is a port side view of the boat shown in FIG. 31, with the port wake-modifying device in a deployed position.

FIG. 45 is a manufacturing view of the port wake-modifying device shown in FIG. 34.

FIG. 46 is a perspective view of the starboard wake-modifying device shown in FIG. 31, detached from the boat and shown here from the outboard side.

FIG. 47 is a perspective view of the starboard wake-modifying device shown in FIG. 46, shown here from the inboard side.

FIG. 48 is a perspective view of the starboard wake-modifying device shown in FIG. 46, turned upside down and shown here from the outboard side.

FIG. 49 is an inboard elevation view of the starboard wake-modifying device shown in FIG. 46.

FIG. 50 is an outboard elevation view of the starboard wake-modifying device shown in FIG. 46.

FIG. 51 is an aft elevation view of the starboard wake-modifying device shown in FIG. 46.

FIG. 52 is a top elevation view of the starboard wake-modifying device shown in FIG. 46.

FIG. 53 is a foreside elevation view of the starboard wake-modifying device shown in FIG. 46.

FIG. 54 is a bottom elevation view of the starboard wake-modifying device shown in FIG. 46.

FIG. 55 is a starboard side view of the boat shown in FIG. 31, with the starboard wake-modifying device in a non-deployed position.

FIG. 56 is a starboard side view of the boat shown in FIG. 31, with the starboard wake-modifying device in a deployed position.

FIG. 57 is a manufacturing view of the starboard wake-modifying device shown in FIG. 46.

FIG. 58 is a stern view of a boat including a pair of wake-modifying devices according to a third preferred embodiment of the invention.

FIG. 59 is a detailed view of the port wake-modifying device shown in FIG. 58.

FIG. 60 is a detailed view of the bottom of the port wake-modifying device shown in FIG. 58.

FIG. 61 is a perspective view of the port wake-modifying device shown in FIG. 58, detached from the boat and shown here from the inboard side.

FIG. 62 is a perspective view of the port wake-modifying device shown in FIG. 61, shown here from the outboard side.

FIG. 63 is a perspective view of the port wake-modifying device shown in FIG. 61, turned upside down and shown here from the outboard side.

FIG. 64 is an outboard elevation view of the port wake-modifying device shown in FIG. 61.

FIG. 65 is an inboard elevation view of the port wake-modifying device shown in FIG. 61.

FIG. 66 is an aft elevation view of the port wake-modifying device shown in FIG. 61.

FIG. 67 is a top elevation view of the port wake-modifying device shown in FIG. 61.

FIG. 68 is a foreside elevation view of the port wake-modifying device shown in FIG. 61.

FIG. 69 is a bottom elevation view of the port wake-modifying device shown in FIG. 61.

FIG. 70 is a port side view of the boat shown in FIG. 58, with the port wake-modifying device in a non-deployed position.

FIG. 71 is a port side view of the boat shown in FIG. 58, with the port wake-modifying device in a deployed position.

FIG. 72 is a manufacturing view of the port wake-modifying device shown in FIG. 61.

FIG. 73 is a perspective view of the starboard wake-modifying device shown in FIG. 58, detached from the boat and shown here from the outboard side.

FIG. 74 is a perspective view of the starboard wake-modifying device shown in FIG. 73, shown here from the inboard side.

FIG. 75 is a perspective view of the starboard wake-modifying device shown in FIG. 73, turned upside down and shown here from the outboard side.

FIG. 76 is an inboard elevation view of the starboard wake-modifying device shown in FIG. 73.

FIG. 77 is an outboard elevation view of the starboard wake-modifying device shown in FIG. 73.

FIG. 78 is an aft elevation view of the starboard wake-modifying device shown in FIG. 73.

FIG. 79 is a top elevation view of the starboard wake-modifying device shown in FIG. 73.

FIG. 80 is a foreside elevation view of the starboard wake-modifying device shown in FIG. 73.

FIG. 81 is a bottom elevation view of the starboard wake-modifying device shown in FIG. 73.

FIG. 82 is a starboard side view of the boat shown in FIG. 58, with the starboard wake-modifying device in a non-deployed position.

FIG. 83 is a starboard side view of the boat shown in FIG. 58, with the starboard wake-modifying device in a deployed position.

FIG. 84 is a manufacturing view of the starboard wake-modifying device shown in FIG. 73.

FIG. 85 shows a boat including a plurality of wake-modifying devices according to a fourth preferred embodiment of the invention.

FIG. 86 is a perspective view of the stern of the boat shown in FIG. 85.

FIG. 87 is a perspective view of the port wake-modifying device shown in FIG. 85 in the non-deployed position.

FIG. 88 is a perspective view of the port wake-modifying device shown in FIG. 85 in the deployed position.

FIG. 89 is a perspective view of the starboard wake-modifying device shown in FIG. 85 in the non-deployed position.

FIG. 90 is a perspective view of the starboard wake-modifying device shown in FIG. 85 in the deployed position.

FIG. 91 is an alternate configuration of the port wake-modifying device shown in FIG. 85 in the non-deployed position.

FIG. 92 is an alternate configuration of the port wake-modifying device shown in FIG. 85 in the deployed position.

FIG. 93 shows a boat including a plurality of wake-modifying devices according to a fifth preferred embodiment of the invention.

FIG. 94 is a perspective view of the stern of the boat shown in FIG. 93.

FIG. 95 is another perspective view of the stern of the boat shown in FIG. 93.

FIG. 96 is a perspective view of the port wake-modifying device shown in FIG. 93 in the non-deployed position.

FIG. 97 is another perspective view of the port wake-modifying device shown in FIG. 93 in the deployed position.

FIG. 98 is another perspective view of the port wake-modifying device shown in FIG. 93 in the deployed position.

FIG. 99 is a perspective view of the starboard wake-modifying device shown in FIG. 93 in the non-deployed position.

FIG. 100 is another perspective view of the starboard wake-modifying device shown in FIG. 93 in the deployed position.

FIG. 101 is another perspective view of the starboard wake-modifying device shown in FIG. 93 in the deployed position.

FIGS. 102A, 102B, 102C, 102D, 102E, and 102F show alternate generally horizontal platforms that may be used with the fourth preferred embodiment of the invention.

FIG. 103 shows a boat including a plurality of wake-modifying devices according to a sixth preferred embodiment of the invention.

FIG. 104 is a perspective view of the stern of the boat shown in FIG. 103.

FIG. 105 shows a boat including a plurality of wake-modifying devices according to a seventh preferred embodiment of the invention.

FIG. 106 is a perspective view of the stern of the boat shown in FIG. 105.

FIG. 107 shows an exemplary control screen for operating the wake-modifying devices shown in the previous figures.

FIG. 108 shows an edit screen accessed from the control screen shown in FIG. 107.

FIG. 109 shows another exemplary control screen for operating the wake-modifying devices shown in the previous figures.

FIG. 110 shows an edit screen accessed from the control screen shown in FIG. 109.

FIG. 111 shows another exemplary control screen for operating the wake-modifying devices shown in the previous figures.

FIG. 112 shows a selection screen accessed from the control screen shown in FIG. 111.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Exemplary preferred embodiments of the invention will now be described with reference to the accompanying figures. Like reference numerals refer to the same or similar elements throughout the figures and description.

First Embodiment

FIGS. 3 and 4 show a boat 100 equipped with a pair of wake-modifying devices 111, 112 in accordance with a first preferred embodiment of the invention. The boat hull 120 includes a bow 121, a transom 122, and port and starboard sides 123, 124. Within the boat's interior is a control console 140 for operating the boat 100. The boat 100 is driven by a single inboard motor (not shown) connected to a left-handed propeller 170. However, the wake-modifying devices 111, 112 can be utilized with other types of boats and propulsion systems, including but not limited to right-handed propellers, outboard motors, sterndrives, and the like.

The boat 100 has a centerline 150 running down the center of the boat, halfway between the port and starboard sides 123, 124. A conventional trim tab 20 is pivotably attached to the transom 122 along the centerline 150. The wake-modifying devices 111, 112 are pivotably attached to the transom 122 on port and starboard sides of the centerline 150, respectively.

FIGS. 5-18 are detailed views of the wake-modifying device 111 on the port side of the boat 100. Similarly, FIGS. 19-30 are detailed views of the wake-modifying device 112 on the starboard side of the boat 100. While the port and starboard wake-modifying devices 111, 112 have many similar features in this embodiment, the port and starboard wake-modifying devices 111, 112 differ with respect to one downturned surface 330, which the port wake-modifying device 111 includes and the starboard wake-modifying device 112 lacks, as will be discussed further below. Except where noted otherwise, the discussion of the wake-modifying devices applies equally to both the port and starboard wake-modifying devices 111, 112.

Each wake-modifying device 111, 112 includes a plate-like member 200 that is pivotably attached to the transom 122 of the boat 100. The plate-like member 200 pivots about a pivot axis 210 to move between a non-deployed position and a deployed position. In this embodiment, the pivot axis 210 is a hinge and is flush with the transom 122 of the boat 100. Here, the hinge is a piano hinge that is welded to a leading portion L of the plate-like member 200 and attached to the transom of the boat 100 using screws. However, any suitable pivotable connection may be used and it may be affixed to the wake-modifying device 111, 112 and transom 122 of the boat 100 using any suitable means, including but not limited to bolts, screws, rivets, welding, and epoxy. In addition, the wake-modifying device 111, 112 may be attached to the transom 122 such that the pivot axis 210 is not flush with the transom 122, for example, the pivot axis may be spaced further aft of the transom 122. The wake-modifying devices 111, 112 also may be attached to portions of the boat other than the transom 122. For example, the wake-modifying devices 111, 112 could be attached to the bottom of the hull 120, to the port and starboard sides 123, 124 of the hull 120, or to a swim platform (not shown). The pivot axis 210 preferably is parallel to the transom 122, but it may be oriented at an oblique angle relative to the transom 122 so long as the wake-modifying device 111, 112 provides an upward force on the boat 100 as the boat 100 travels forward through the water.

In the embodiment shown, the pivot axis 210 is parallel to the deadrise (the angle of the hull from the keel to the chine at the transom 122) of the boat 100. But the pivot axis 210 may instead be at an angle relative to the deadrise. Some boats, for example, have little or no deadrise. In such cases, it may be advantageous to orient the pivot axis 210 at an angle relative to the deadrise. Preferably, the pivot axis is inclined no more than about 35° from horizontal, more preferably no more than about 20° from horizontal, and most preferably no more than about 15° from horizontal. This inclination is preferably in the direction from the chine to the keel. Preferably, the pivot axis is inclined no more than about 15° more than the deadrise.

The plate-like member 200 has a trailing portion T that is aft of the leading portion L. The trailing portion T is the aft half of the plate-like member 200, and the leading portion L is the forward half of the plate-like member 200. The plate-like member 200 also has an inboard portion I and an outboard portion O. The inboard portion I is the inboard half of the plate-like member, and the outboard portion O is the outboard half of the plate-like member. Thus, the plate-like member may be divided into quadrants as shown in FIGS. 13 and 25: a leading, inboard portion L, I; a leading, outboard portion L, O; a trailing, inboard portion T, I; and a trailing, outboard portion T, O.

In the embodiment shown, there are two downturned surfaces 310, 320 at the trailing portion T of the plate-like member 200. The first downturned surface 310 intersects the plate-like member 200 along a line that is generally parallel to the pivot axis 210. The second downturned surface 320 intersects the plate-like member 200 along a line that is oriented at an angle α relative to the pivot axis 210. In this embodiment, the first downturned surface 310 is outboard of the second downturned surface 320, which is at the trailing, inboard portion T, I of the plate-like member 200. The second downturned surface 320 may extend into adjacent quadrants without deviating from the scope of the invention. The first and second downturned surfaces 310, 320 preferably are at the edge of the plate-like member 200, but they may be inward of the edge.

The inventors believe that the combination of the plate-like member 200 and one or both of the downturned surfaces 310, 320 improves the size and shape of the wake. The side of the boat 100 with the desirable wake is referred to as the surf side. The surf side is the side of the boat 100 opposite a deployed wake-modifying device. The side with the deployed wake-modifying device is referred to as the non-surf side.

As the boat 100 moves through the water, the hull displaces water both downward under the hull 120 and outward of the sides 123, 124 of the hull 120. This creates a cavity immediately behind the boat 100. The displaced water recovers behind the boat 100 to fill the cavity. As the displaced water recovers, the water converges from under the boat 100 and from the sides 123, 124 of the hull 120. When the convergence occurs with sufficient force, it creates a v-shaped wave crest or “rooster tail” at the point of convergence. This v-shaped crest then propagates outward behind the boat 100 creating a wake that is suitable for wakeboarding, wake surfing, and the like. When one of the wake-modifying devices 111, 112 is in the deployed position, the downturned surfaces 310, 320 direct the water sharply downward. This sharp redirection of water results in an additional upward force to roll the boat 100 toward the surf side to a greater degree than the prior art trim tabs discussed above and shown in FIGS. 1 and 2. As a result, the boat 100 displaces more water on the surf side creating a more desirable wake for surfing. The inventors have found that shifting the point of convergence aft of the transom 122 and toward the non-surf side will also improve the wake on the surf side. The inventors believe that creating a trough in the water behind the deployed wake-modifying device and delaying the water from recovering from the non-surf side shifts the convergence point aft of the transom 122 and toward the non-surf side. The downturned surfaces 310, 320 are believed to contribute to both of these actions. The angles of the downturned surfaces and the size of the plate contribute to the timing of water recovery to increase the size of the wake on the surf side as a result of wave superposition.

The downturned surface 310, 320 should extend far enough in a downward direction to cause redirection of the water. The downturned surface 310, 320 should also be short enough that the downturned surface does not interact with the water when in the non-deployed position. Preferably, the downturned surface 310, 320 extends from about 1 inch to about 2¼ inches below a lower surface 220 of the plate-like member 200, and more preferably about 1½ inches below the lower surface 220 of the plate-like member 200. The downturned surface 310, 320 forms an angle β with a lower surface 220 of a central portion of the plate-like member 200. The inventors have found that this angle β should be sufficient to redirect the water, but not so sharp as to result in excessive force on the wake-modifying device 111, 112. Preferably, the angle β between the downturned surface 310, 320 the lower surface 220 of the central portion of the plate-like member 200 is between about 120° and about 135°.

The water converging behind the boat 100 from the sides 123, 124 of the hull 120 forms an angle with the sides of the hull 123, 124. The inventors have found that orienting a downturned surface 320 to intersect this angle improves the wake on the surf side. Accordingly, the line where the second downturned surface 320 intersects the plate-like member 200 is oriented at an angle α relative to the pivot axis 210. This angle α preferably is perpendicular to the angle formed between the recovering water and the side 123, 124 of the hull 120. The angle α preferably is between about 30° to about 45°.

In the embodiment shown, the wake-modifying device 111, 112 has two upturned surfaces 410, 420 between the first downturned surface 310 and the pivot axis 210. These upturned surfaces 410, 420 are at the outboard portion O of the plate-like member 200, preferably at the edge of the plate-like member, but they may be inward of the edge. An angle γ between the upturned surfaces 410, 420 and an upper surface 230 of the central portion of the plate-like member 200 preferably is between about 30° to about 150°, and more preferably is about 90°. The inventors believe that these upturned surfaces 410, 420 delay the water on the non-surf side from converging behind the boat 100 and further shift the point of convergence aft of the transom 122 and toward the non-surf side. The upturned surfaces 410, 420 should extend far enough in an upward direction to delay the water. The upturned surfaces 410, 420 preferably extend at least about 1 inch above the upper surface 230 of the plate-like member 200, more preferably at least about 2 inches above the upper surface 230 of the plate-like member 200, and even more preferably at least about 2.5 inches above the upper surface 230 of the plate-like member 200. In this embodiment, the first upturned surface 410 intersects the plate-like member along a line that is generally parallel to either the port side 123 of the hull 120 or the starboard side 124 of the hull 120. The second upturned surface 420 is positioned between the first upturned surface 410 and the first downturned surface 310 and intersects the plate-like member along a line that is oriented at an oblique angle δ with respect to the pivot axis 210. The angle δ preferably is between about 60° to about 90°, and more preferably is about 75°.

A third downturned surface 330 between the second downturned surface 320 and the pivot axis 210 can further improve the wake on the surf-side. An angle ε between the third downturned surface 330 and the lower surface 220 of the central portion of the plate-like member 200 preferably is between about 30° to about 150°, and more preferably is about 90°. The inventors believe this third downturned surface 330 further delays the water on the non-surf side from converging with the water on the surf side. In the embodiment shown, the third downturned surface 330 is positioned along the inboard portion I of the plate-like member 200 and intersects the plate-like member 200 along a line that is generally perpendicular to the pivot axis 210. The third downturned surface 330 preferably is at an inboard edge of the plate-like member, but it may be inward of the edge. Similar to the other downturned surfaces 310, 320, the third downturned surface 330 should extend far enough in a downward direction to delay or redirect the water. As with the other downturned surfaces 310, 320, the third downturned surface 330 is preferably short enough that the third downturned surface 330 does not interact (or at least minimizes interaction) with the water when in the non-deployed position. The third downturned surface 330 preferably extends between about ½ inch to about 3 inches below the lower surface 220 of the plate-like member 200, and more preferably extends about 1 inch below the lower surface 220 of the plate-like member 200.

The boat 100 of this embodiment uses a left-handed propeller 170, which causes the prop wash to be offset towards the starboard side. To balance the desirability of the surf wakes on both sides of the boat 100, the port wake-modifying device 111 of this embodiment provides more delay of the water than does the starboard wake-modifying device 112. In this embodiment, the port wake-modifying device 111 has the third downturned surface 330 while the starboard wake-modifying device 112 does not. However, the third downturned surface 330 may be provided on either the port or starboard wake-modifying device 111, 112, both, or neither.

FIG. 16 shows the port wake-modifying device 111 in a non-deployed position, and FIG. 17 shows the port wake-modifying device 111 in a deployed position. Similarly, FIG. 28 shows the starboard wake-modifying device 112 in a non-deployed position, and FIG. 29 shows the starboard wake-modifying device 112 in a deployed position. As water recovers from under the boat, it travels at an upward angle. The angle of water recovery will depend on a number of factors including hull design and operational parameters, for example, speed. In the non-deployed position, the wake-modifying device 111, 112 preferably is at an upward angle so that it does not interact with the recovering water. The wake-modifying device 111, 112 is moved from the non-deployed position to a deployed position by pivoting about the pivot axis 210. In the deployed position, the trailing portion T of the wake-modifying device 111, 112 is lower than it is in the non-deployed position. The deployed position preferably is even with the bottom of the hull and more preferably extends at a downward angle ζ as shown in FIGS. 17 and 29. As discussed above, the wake-modifying device 111, 112 may be pivotable about an axis that is not horizontal, for example, it may be at an angle parallel to the deadrise. The deployed position is not limited to a single angle ζ but rather may vary depending upon the preferences of the water sports performer. In this embodiment, the angle ζ is directly proportional to the size of the wake, but as the angle ζ gets larger, the wake begins to break (curl over) closer to the boat 100, reducing the area on the wake that is desirable for surfing. In this embodiment, the angle ζ preferably is between about 0° and about 12°.

In the embodiment shown, a linear actuator 510 is used to move the wake-modifying device 111, 112 between the deployed and non-deployed positions. The linear actuator 510 preferably is an electric linear actuator, such as one available from Lenco Marine. One end of the linear actuator 510 is screwed to the transom 122 of the boat 100. The other end of the linear actuator is connected to a u-shaped bracket 202 by a pin 204. The u-shaped bracket 202 is then bolted to the plate-like member 200. Any suitable means may be used to move the wake-modifying device 111, 112 between the deployed and non-deployed positions, including but not limited to hydraulic linear actuators and mechanical levers.

The size of the wake-modifying device 111, 112 may be varied depending upon the characteristics of the boat 100 and the desired wake. The lift provided by the wake-modifying device 111, 112 is generally proportional to the angles α, β, the surface area of the first and second downturned surfaces 310, 320, and the surface area of the plate-like member 200. In this embodiment, the wake-modifying device 111, 112 is about 17 inches long and about 14.5 inches wide. Preferably, the wake-modifying device 111, 112 is at least about 10 inches long and at least about 9 inches wide.

Because the wake-modifying device 111, 112 is used in a marine environment, it preferably is made of materials suitable for that environment. In this embodiment, these materials are primarily corrosion-resistant metal alloys such as stainless steel. The wake-modifying device 111, 112, including the plate-like member 200, preferably should not deform during operation. Preferably, the wake-modifying device 111, 112 will have sufficient rigidity to maintain its shape at all speeds and especially at speeds suitable for surfing (approximately 9 mph to 12 mph). In the preferred embodiment, the wake-modifying device 111, 112 is made from 12 gauge stainless steel plate. Other suitable materials may be used instead, such as wood, plastic, fiber reinforced composites, or other metals including aluminum.

FIGS. 18 and 30 show manufacturing views of the port and starboard wake-modifying devices 111, 112, respectively. The wake-modifying device 111, 112 may be manufactured by cutting the device from a single plate stock to the desired shape and then bending the downturned and upturned surfaces to the desired angles. In this embodiment, the plate-like member 200, the downturned surfaces 310, 320, 330, and the upturned surfaces 410, 420 are an integral piece. Alternatively, some or all of the downturned and upturned surfaces may be formed as separate pieces and then attached to the plate-like member using any suitable joining method such as welding, bolting, riveting, or the like.

Second Embodiment

Boat design plays an important role in establishing the wake shape. Design factors include, for example, the hull design and the weight of the boat. The wake-modifying device 111, 112 preferably is customized based on the boat design in order to produce the desired wake.

As an example of how hull design affects the boat's wake, a first boat having a steeper deadrise than a second boat will typically allow the water to recover closer to the transom of the boat. The shape of the corners between the sides of the hull and the transom also impact the recovery of the water. A boat with smooth corners (e.g., having a radius) will allow the water to recover faster than will a boat with square corners. The wake-modifying devices 111, 112 of the second embodiment are designed to provide greater lift to the boat on the non-surf side and further delay and direct the water on the non-surf side.

FIG. 31 shows a stern view of a boat 100 equipped with wake-modifying devices 111, 112 according to a second preferred embodiment of the invention. The port wake-modifying device 111 of the second embodiment is shown in FIGS. 32-45. The starboard wake-modifying device 112 of the second embodiment is shown in FIGS. 46-57.

As with the first embodiment, the port and starboard wake-modifying devices 111, 112 of the second embodiment are not symmetrical with one another. Here, the port wake-modifying device 111 includes two fins 340, 350 attached to the lower surface 220 of the plate-like member 200. These fins 340, 350 extend at a downward angle η relative to the lower surface 220 of the plate-like member 200. The downward angle η preferably is between about 30° and about 150°, and more preferably is about 90°. The fins 340, 350 intersect the plate-like member 200 along lines that are oriented at an angle θ relative to the pivot axis 210. This angle θ preferably is between about 15° and about 75°, and more preferably is between about 30° and about 60°. In the embodiment shown, the fins 340, 350 are parallel to each other and at an angle θ of 60° relative to the pivot axis 210. The inventors believe these fins 340, 350 redirect the water outboard, further shifting the point of convergence aft from the transom 122 and toward the non-surf side. As with the downturned surfaces 310, 320, 330 and the upturned surfaces 410, 420, the fins 340, 350 should extend far enough away from the plate-like member 200 to redirect the water flow. The fins 340, 350 preferably should extend at least about 1 inch below the lower surface 220 of the plate-like member 200, and more preferably should extend at least about 2 inches below the lower surface 220 of the plate-like member 200. In the embodiment shown, the fins 340, 350 have different lengths. The fins preferably are about 4 inches to about 16 inches long, and more preferably are about 8 inches to about 12 inches long. The fins preferably do not extend beyond the edges of the plate-like member.

In the second embodiment, the third downturned surface 330 intersects the plate-like member along a line that is oriented at an oblique angle ϕ relative to the pivot axis 210. The angle ϕ preferably is between about 45° to about 90°, and more preferably is about 70°. All three of the downturned surfaces 310, 320, 330 form an angle α, ε with respect to the lower surface 220 of the central portion of the plate-like member 200 of about 135°. The wake-modifying devices 111, 112 of this embodiment preferably are about 17 inches wide and about 16 and ½ inches long.

Third Embodiment

The port and starboard wake-modifying devices 111, 112 in the previous two embodiments are asymmetrical with each other, but the wake-modifying devices 111, 112 can be symmetrical. Symmetrical wake-modifying devices 111, 112 may be used, for example, with heavy boats where the propeller 170 has less of an impact on the boat's wake. The third preferred embodiment shown in FIGS. 58-84 is an example of a symmetrical pair of wake-modifying devices 111, 112. FIG. 58 shows a stern view of a boat 100 equipped with wake-modifying devices 111, 112 according to a third embodiment of the invention. The port wake-modifying device 111 of the third embodiment is shown in FIGS. 59-72. The starboard wake-modifying device 112 of the third embodiment is shown in FIGS. 73-84. In this embodiment, both the port and starboard wake-modifying devices 111, 112 have two fins 340, 350. In the embodiment shown, the fins 340, 350 are parallel to each other and oriented at an angle θ of 45° relative to the pivot axis 210.

Fourth Embodiment

As discussed above, the wake-modifying devices do not have to be attached to the transom 122 of the boat 100. Instead, the wake-modifying devices may be attached further aft of the transom 122, such as to a swim platform. While the wake-modifying devices 111, 112 of the first, second, and third embodiments may be suitably used to modify the boat's wake when mounted to a swim platform, wake-modifying devices having alternate designs may also be suitably used to modify the boat's wake when mounted to the swim platform. Such alternate wake-modifying devices suitable for modifying a boat's wake when mounted to a swim platform are described in the fourth, fifth, sixth, and seventh embodiments.

FIGS. 85 and 86 show a boat 100 equipped with a pair of wake-modifying devices 802, 804 in accordance with a fourth preferred embodiment of the invention. The boat 100 includes a generally horizontal platform 700 at the stern of the boat 100 and extending aft of the transom 122. The platform 700 may be referred to as a swim platform or a boarding platform. The platform 700 should be capable of supporting a human and is preferably capable of supporting at least about 100 lbs, which is approximately the fifth percentile for female weight. More preferably, the platform is capable of supporting at least 500 lbs. and even more preferably 1250 lbs. The platform 700 may be constructed from any suitable material that may be used in a marine environment including, for example, fiberglass and teak. The platform 700 has a top surface 702 and a bottom surface 704. A person may stand or sit on the top surface 702 of the platform 700 making it easier for the person to get into the water from the boat 100 or out of the water into the boat.

In this embodiment, the platform 700 is attached to the transom 122 of the boat 100. Two brackets 710, 720 are attached to the bottom surface 704 of the platform 700. In this embodiment, the brackets 710, 720 are L-shaped. One leg portion 712, 722 of each bracket 710, 720 extends aft of the transom 122 along the bottom surface 704 of the platform 700 and is attached to the bottom surface 704 using fasteners. The other leg portion 714, 724 of each bracket 710, 720 is attached to the transom 122 of the boat 100 using fasteners. In this embodiment, the fasteners used to attach the brackets to the platform 700 and the transom 120 are screws; however, any suitable means of attachment known in the art may be used including but not limited to bolts, rivets, welding, adhesive, and the like. Alternatively, the brackets 710, 720 may be integrally formed into either the platform 700 or the transom 122 of the boat. Similarly, the platform 700 may be attached to the transom 122 by any suitable means and is not limited to the use of brackets 710, 720. While the platform 700 is described as an attachable/detachable platform, it is not so limited. For example, the platform 700 may be integrally formed in the stern of the boat.

The platform 700 has a leading edge 742, a port edge 744, a starboard edge 746, and a trailing edge 748. The platform also has a centerline 750, which is coincident with the boat's centerline 150 in this embodiment. While FIGS. 85 and 86 depict the platform 700 as having a pentagonal shape (edges 748a and 748b, together forming the trailing edge 748), those skilled in the art will appreciate that the platform 700 may take any number of shapes such as those discussed further below.

Attached to the underside (bottom surface 704 in this embodiment) of the platform 700 is at least one wake-modifying device 802, 804. In this embodiment, two wake-modifying devices 802, 804 are attached to the platform 700. A port wake-modifying device 802 is positioned on a port side of the platform's centerline 750, and a starboard wake-modifying device 804 is positioned on a starboard side of the platform's centerline 750.

As discussed above, a v-shaped wave crest propagates outward and aft behind the boat. Each wake-modifying device is positioned on the platform 700 so that it can interact with the wave crest. In this embodiment, each wake-modifying device 802, 804 is independently moveable between a non-deployed position and a deployed position. The port wake-modifying device 802 is shown in the non-deployed position in FIG. 87 and in the deployed position in FIGS. 85, 86, and 88. The starboard wake-modifying device 804 is shown in the non-deployed position in FIGS. 85, 86, and 89 and in the deployed position in FIG. 90.

In this embodiment, each wake-modifying device 802, 804 includes a plate-like member 810, 820. The plate-like members 810, 820 have a preferably straight edge 812, 822 where they are attached to the platform and an outer contour 814, 824. In this embodiment, the outer contour 814, 824 is a parabolic shape, although the outer contour may have other shapes, such as those discussed below. The plate-like members 810, 820 also have a lower surface 816, 826 and an upper surface 818, 828. In this embodiment, the lower surfaces 816, 826 and upper surfaces 818, 828 are generally flat, but they may also be contoured as discussed below.

In the non-deployed position, the wake-modifying devices 802, 804 are positioned in a plane that is generally parallel to platform 700. In the deployed position, the deployed wake-modifying device is able to modify or sculpt the wake. Unlike the wake-modifying devices 111, 112 of the first, second, and third embodiments, the wake-modifying devices 802, 804 of the fourth embodiment are deployed on the surf side of the boat. When a water sports performer is surfing, for example, on the port side of the boat 100, the port wake-modifying device 802 is deployed, as shown in FIGS. 85 and 86, to modify the wake propagating aft and port of the boat 100.

The wake-modifying devices 802, 804 move between the non-deployed position and the deployed position by pivoting about a pivot axis 832, 842. The pivot axis 832, 842 in this embodiment is a hinge. Here, the hinge is a piano hinge that is welded to the edge 812, 822 of each wake-modifying device 802, 804 and attached to the bottom surface 704 of the platform using screws. Any suitable means known in the art may be used to connect the pivot axis 832, 842 to the plate-like members 810, 820 and the bottom surface 704 of the platform 700, including but not limited to rivets, bolts, adhesive, and the like. In pivoting about its respective pivot axis 832, 842, each wake-modifying device 802, 804 is capable of assuming multiple deployed positions. Each different deployed position is a different downward angle λ relative to the wake-modifying device's non-deployed position. Preferably the downward angle λ is from about 10 degrees to about 80 degrees, more preferably from about 30 degrees to about 60 degrees.

In the embodiment shown, a linear actuator 510 is used to independently move each wake-modifying device 802, 804 between the deployed and non-deployed positions. The linear actuator 510 preferably is an electric linear actuator, such as one available from Lenco Marine. One end of each linear actuator 510 is screwed to the bottom surface 704 of the platform 700. The other end of each linear actuator 510 is connected to a u-shaped bracket 836, 846 by a pin 838, 848. The u-shaped bracket 836, 846 is bolted to the lower surfaces 816, 826. Any suitable means may be used to move the wake-modifying devices 802, 804 between the deployed and non-deployed positions, including but not limited to hydraulic linear actuators, mechanical levers, and motors.

The wake-modifying devices 802, 804 are not limited to moving between the non-deployed and deployed positions by pivoting about the pivot axis 832, 842. For example, the wake-modifying devices 802, 804 may move between the non-deployed and deployed positions by linearly translating at the downward angle λ relative to the platform 700. FIGS. 91 and 92 show an example of the port wake-modifying device 802 translating instead of pivoting. In the non-deployed position shown in FIG. 91, the plate-like member 810 is located in housing 852. The housing 852 includes a cut-out 854 for the u-shaped bracket 836. In this configuration, the u-shaped bracket 836 is bolted to the upper surface 818. The linear actuator 510 is driven to translate the plate-like member 810 in direction A to move from the non-deployed position to the deployed position. The housing 852 guides the port wake-modifying device 802 as it moves between the non-deployed and deployed positions. FIG. 92 shows the port wake-modifying device 802 in the deployed position.

By positioning the wake-modifying devices 802, 804 on the platform, the inventors believe they can obtain at least two benefits. First, by positioning the wake-modifying devices 802, 804 at an oblique angle μ, ν relative to the platform's centerline 750, energy of the wake that is naturally shaped by the hull and would have blended into the wave crest is redirected, by the lower surface 816, 826, inboard and aft, thereby lengthening the surfable area of the wake. Preferably, the oblique angle μ of the port wake-modifying device 802 is an acute angle rotated counterclockwise relative to the platform's centerline 750 when viewed from above, more preferably the oblique angle μ is from about 10 degrees to about 80 degrees, and even more preferably from about 30 degrees to about 60 degrees. In this embodiment, the pivot axis 832 is set at the oblique angle μ. Preferably, the oblique angle ν of the starboard wake-modifying device 804 is an acute angle rotated clockwise relative to the platform's centerline 750 when viewed from above, more preferably the oblique angle ν is from about 10 degrees to about 80 degrees, and even more preferably from about 30 degrees to about 60 degrees. In this embodiment, the pivot axis 832 is set at the oblique angle ν.

The second benefit is that the shape of the outer contour 814, 824 of the wake-modifying devices 802, 804 sculpts or shapes the wake. The outer contour 814, 824 may be divided into a leading edge 814a, 824a and a trailing edge 814b, 824b. The inventors believe that the trailing edge 814b, 824b of the wake-modifying devices 802, 804 shapes the wake as the wave crest moves past the trailing edge 814b, 824b. The outer contour 814, 824 and trailing edge 814b, 824b, in particular, may take any number of shapes. In this embodiment, the outer contour 814, 824 has a parabolic shape, which may include a semi-circular shape.

The wave crest may be rough and frothy for a distance starting at the rooster tail but then change to a sharp, clean wave crest that is desirable for surfing. The inventors have found that the wake-modifying devices 802, 804 “clean-up” the wave crest by increasing the distance that the wave crest sharp and clean.

Preferably, each wake-modifying device 802, 804 is positioned proximate the trailing edge 748 of the platform 700. By positioning the wake-modifying devices proximate the trailing edge 748, the distance below the bottom surface 704 of the platform 700 that each wake-modifying device 802, 804 must extend to interact with the wave crest can be minimized. Preferably, the leading edge 814a, 824a of each wake-modifying device 802, 804 is from about 1 foot to about 3 feet behind the transom 122 of the boat 100. Each wake-modifying device 802, 804 is preferably positioned on the outboard third of the platform 700, and more preferably the port wake-modifying device 802 is positioned proximate the port edge 744 of the platform 700 and the starboard wake-modifying device 804 is positioned proximate the starboard edge 746.

Fifth Embodiment

FIGS. 93, 94, and 95 show a boat 100 equipped with a pair of wake-modifying devices 902, 904 in accordance with a fifth preferred embodiment of the invention. As discussed above, the wake-modifying devices 802, 804 of the fourth embodiment preferably are located proximate the outboard edges (port and starboard edges 744, 746) and the trailing edge 748 of the platform 700. In the fifth embodiment, the wake-modifying devices 902, 904 are the trailing edge corners of the platform 700. That is, the port wake-modifying device 902 is the corner of the platform 700 where the port edge 744 and the trailing edge 748 intersect. Similarly, the starboard wake-modifying device 904 is the corner of the generally horizontal platform 700 where the starboard edge 746 and the trailing edge 748 intersect.

Each wake-modifying device 902, 904 has an upper surface 918, 928 that is substantially co-planar with the top surface 702 of the platform 700 when the wake-modifying device is in the non-deployed position. The wake-modifying devices 902, 904 move between the non-deployed position and the deployed position by pivoting about a pivot axis 932, 942 through the use of a linear actuator 510. The port wake-modifying device 902 is shown in the non-deployed position in FIG. 96 and in the deployed position in FIGS. 93, 94, 95, 97, and 98. The starboard wake-modifying device 904 is shown in the non-deployed position in FIGS. 93, 94, 95, and 99 and in the deployed position in FIGS. 100 and 101.

The linear actuator 510 is connected to both the bottom surface 704 of the generally horizontal platform 700 and a top face 934, 944 of the wake-modifying devices. The pivot axes 932, 942 are positioned at an oblique angle μ, ν relative to the platform's centerline 750, as discussed above in the fourth embodiment.

In this embodiment, the outer contour 912, 922 of each of the wake-modifying devices corresponds to the outer contour of the platform 700. The outer contour 912 of the port wake-modifying device 902 has a leading edge 912a that corresponds to the port edge 744 of the platform 700. The outer contour 922 of the starboard wake-modifying device 904 has a leading edge 922a that corresponds to the starboard edge 746 of the platform 700. A trailing edge 912b, 922b of each wake-modifying device 902, 904 corresponds to the trailing edge 748 of the platform 700. As discussed above, this outer contour 912, 922, in particular trailing edge 912b, 922b, is beneficial in modifying the wake. In this embodiment, the trailing edge 912b, 922b preferably forms an angle ρ with the pivot axis 932, 942 that is less than about 90°, and the outer contour 912, 922 and the pivot axis 932, 942 form a generally triangular shape. Preferably, the generally triangular shape is an obtuse generally triangular shape, more preferably the obtuse angle σ is between about 90° and about 150°, and even more preferably about 135°.

The outer contour 912, 922 is not limited to a triangular shape, and may have, for example, a parabolic shape such as discussed above in the fourth embodiment. Likewise, the platform 700 may have a shape other than a pentagonal shape and the outer contour 912, 922 of the wake-modifying devices 902, 904 may take on a shape corresponding to the shape of the platform. Several examples of these platforms 700 with alternative shapes are shown in FIGS. 102A-102E. In FIGS. 102A-102E, top views of the platform 700 are shown with the pivot axes 932, 942 shown in broken lines. A rectangular platform 700 is shown in FIG. 102A. The corners of the horizontal platform do not have to be a sharp point, and may have a radius as shown in FIG. 102B or a chamfer as shown in FIG. 102C. Or, the platform may have a trapezoidal shape as shown in FIG. 102D or a semi-ovular (or semi-circular) shape as shown in FIG. 102E. The pentagonal-shaped platform 700 is shown in FIG. 102F for comparison. In these alternate platform shapes, the trailing edge 748 may be considered to be the edge (or edges) that is more parallel to the transom 122 of the boat 100 compared to edges that are more perpendicular to the transom 122. In the case where the platform is ovular (FIG. 102E), for example, the trailing edge 748 is where a line 950 tangent to the edge of the generally horizontal platform is less than 45° with respect to the transom 122.

Instead of having a flat lower face (such as the wake-modifying devices 802, 804 described in the fourth embodiment), the wake-modifying devices 902, 904 may have a generally convex shape. In this embodiment, the convex shape is generally triangular with two faces: a leading face 914, 924 and a trailing face 916, 926. Instead of being a sharp point, the intersection of the leading face 914, 924 and the trailing face 916, 926 is rounded or curved. The angle between the leading face 914, 924 and the trailing face 916, 926 is preferably less than 180°, more preferably between about 100° and about 170°, and even more preferably between about 140° and about 160°. Other suitable convex shapes may be used for the leading face 914, 924 and the trailing face 916, 926, including, for example, a parabolic shape. Such convex shapes and smooth intersections between surfaces help keep the water flow laminar as it flows past the wake-modifying devices 902, 904. A wake-modifying device 902, 904 on the platform 700 that maintains laminar flow may result in a wake that is more desirable to a wake surfer than a wake-modifying device that imparts turbulence to the wake. The angled leading and trailing faces 914, 916, 924, 926 may also be used to direct the energy of the propagating wake. In particular, the trailing faces 916, 926 may be used to redirect the energy of the wake that is naturally shaped by the hull and would have blended into the wave crest. By angling these trailing faces 916, 926 at an oblique angle relative to the centerline of the platform 750, the energy of the wake may be directed inboard and aft, thereby lengthening the surfable area of the wake.

Although the wake-modifying devices have been described as having either a flat lower face (e.g., wake-modifying devices 802, 804 described in the fourth embodiment) or a convex shape, as in this embodiment, the wake-modifying devices may have other suitable shapes that can be used to direct the energy of the wake and shape the wake. Suitable shapes include but are not limited to a concave shape, a triangular shape having a right angle, or an asymmetrical shape such as an asymmetrical triangle. These shapes may be particularly apparent in the top faces 934, 944 of the wake-modifying devices 902, 904. With an asymmetrical shape, how the energy of the wake is redistributed may be varied, for example, a greater percentage can be directed aft instead of inboard.

Sixth Embodiment

FIGS. 103 and 104 show a boat 100 equipped with a pair of wake-modifying devices 1002, 1004 in accordance with a sixth preferred embodiment of the invention. The sixth embodiment is, in many ways, a combination of the fourth and fifth embodiments, and the description of features similar to those in the embodiments above are not repeated here. As with the wake-modifying devices 902, 904 of the fifth embodiment, the wake-modifying devices 1002, 1004 of the sixth embodiment are part of the platform 700. Like the fourth embodiment, however, the top surface 702 of the platform 700 remains stationary. While the wake-modifying devices 1002, 1004 may have any suitable shape, they are shown here with the shape of the wake-modifying devices of the fifth-embodiment.

Each wake-modifying device 1002, 1004 is a portion of the platform 700. Above each wake-modifying device 1002, 1004 is a portion of the platform that remains stationary (stationary portions 1012, 1014). The top surface 702 of the platform corresponding to the stationary portion 1012, 1014 does not move as the wake-modifying devices 1002, 1004 are moved between the non-deployed and deployed positions.

Seventh Embodiment

FIGS. 105 and 106 show a boat 100 equipped with a pair of wake-modifying devices 1102, 1104 in accordance with a seventh preferred embodiment of the invention. While the wake-modifying devices 1102, 1104 may have any suitable shape, they are shown here with the shape of the wake-modifying devices of the fifth embodiment. The wake-modifying devices 1102, 1104 have features similar to those described in the embodiments above, and the description of those features are omitted here.

Unlike the wake-modifying devices of the fourth, fifth, and sixth embodiments, the wake-modifying devices 1102, 1104 of the seventh embodiment are stationary. That is, the wake-modifying devices 1102, 1104 are attached to an underside (bottom surface 704) of the platform 700 in such a way that the contour 912, 922, and leading and trailing faces 914, 916, 924, 926 modify the boat's wake as discussed above.

The boat's wake, and in particular the v-shaped wave crest, is relatively small when the boat is moving slowly or lightly loaded. Thus, the wake-modifying devices 1102, 1104 may project downward from the bottom surface 704 of the platform 700 a distance such that they only modify the boat's wake when it is operating above a predetermined speed or with ballast greater than a predetermined amount. Additionally, when the wake-modifying devices 1102, 1104 are used with trim tabs 10, 30 or the wake-modifying devices 111, 112 of the first, second, or third embodiment, the wake-modifying devices 1102, 1104 may interact with the boat's wake because the boat will roll toward the surf side, thus lowering the wake-modifying devices 1102, 1104 into the boat's wake.

Operation

Each of the seven embodiments of the wake-modifying devices described above may be individually used to modify the boat's wake. For example, the wake-modifying devices 111, 112 of the first embodiment may be mounted to the transom 122 and used to modify the boat's wake without other wake-modifying devices. Likewise, the wake-modifying devices 802, 804 of the fourth embodiment may be used to modify the boat's wake without other wake-modifying devices. However, the wake-modifying devices described in each of the embodiments above are not limited to individual use and may instead be used in combination with other wake-modifying devices or means to modify the wake.

In one example, the center trim tab 20 may be used with boats equipped with any one of the wake-modifying devices described. Additionally, the wake-modifying devices of one of the embodiments described above may also be used with a wake-modifying device of another embodiment. For example, the wake-modifying devices 111, 112 of the first embodiment may be mounted to or near the transom 122. These wake-modifying devices may then be used in combination with additional wake-modifying devices, such as the wake-modifying devices 902, 904 of the fifth embodiment, that are mounted to or are part of the platform 700.

The wake-modifying devices described herein, whether used individually or in combination with other wake-modifying devices, may also be used, for example, with means to increase the displacement of the boat 100. Those skilled in the art understand that the weight and displacement of the boat has a significant impact on the size and shape of the wake. As a result, many recreational sport boats that are used for wakeboarding and wake surfing accommodate additional weight or ballast. The addition of ballast increases the displacement of the boat. When the ballast is added to the stern of the boat, in particular, the wake of the boat may be increased. Many boats are also designed to have ballast added to the surf side of the boat to increase the displacement of that side of the boat. This weight may be added by any number of ways known to those skilled in the art. One way is to position more people in a particular portion of the boat, such as in the stern as compared to the bow or on the surf side of the boat as compared to the non-surf side. Another way is to add ballast through the use of ballast bags or ballast sacks. Yet another way to add weight is through ballast tanks installed in the boat. Preferably, two ballast tanks are positioned in the stern of the boat near the bottom of the hull, one on each side of the boat, and a third ballast tank is positioned along the boat's centerline near the bottom of the hull, forward of the two rear ballast tanks. If ballast bags are used in addition to ballast tanks, the ballast bags may be plumbed into the ballast system of the boat. Both the ballast tanks and the ballast bags operate similarly in that water may be pumped into the tank or bag by ballast pumps to add weight. In some boats, both ballast tanks and ballast bags may be used simultaneously. For example, all three ballast tanks may be filled to increase the displacement of the stern of the boat, and a ballast bag on the surf side of the boat may be filled to further increase the displacement on the surf side.

Control System

A control system is used to operate the wake-modifying devices 111, 112, 802, 804, 902, 904, 1002, 1004, 1102, 1104. When the wake-modifying devices 111, 112, 802, 804, 902, 904, 1002, 1004, 1102, 1104 are used with plumbed-in ballast, the control system preferably controls both the ballast and the wake-modifying devices 111, 112, 802, 804, 902, 904, 1002, 1004, 1102, 1104. This control system preferably includes a controller that controls the linear actuators 510 and the ballast pumps. The controller may be any suitable controller known in the art including a controller comprising a CPU, ROM, and RAM. The control system also includes an input device. In the preferred embodiment, the input device is a touchscreen located at the control console 140 of the boat 100. Also in this embodiment, the controller is co-located with the touchscreen. Those skilled in the art will recognize that any suitable input device, including but not limited to buttons, switches, dials, or the like may be used. The controller may operate the linear actuators 510 and ballast pumps by sending control signals to a power distribution module. This power distribution module may individually supply power to the linear actuators 510 and the ballast pumps upon receipt of a supply power command. The power distribution module may also stop supplying power to the linear actuators 510 or ballast pump upon receipt of a command to stop.

An exemplary touchscreen 610 is shown in FIG. 107. This touchscreen shows the use of the control system with the center trim tab and one pair of wake-modifying devices described above. The following example references the wake-modifying devices 111, 112 of the first, second, or third embodiment, but is equally applicable when the wake-modifying devices of the fourth, fifth, or sixth embodiments are used. This touchscreen 610 is shown in a manual mode. In this mode, a user can manually adjust the amount of water in the ballast tanks and manually adjust the percentage of deployment of the wake-modifying devices 111, 112. To adjust ballast, the user selects the “BALLAST” button 611. To adjust the deployment of the wake-modifying devices or center trim tab 20, the user selects the “TABS” button 612. To adjust the speed of the boat, the user selects the “SET SPEED” button 613. When one of these buttons is selected, a new screen is displayed that allows the user to adjust the selected parameter. When the user selects the “TABS” button 612, for example, an “EDIT TABS” screen 620 is displayed as shown in FIG. 108. On this screen 620, the user may adjust the percentage deployment of the wake-modifying devices 111, 112 and/or the center trim tab 20. To deploy the port wake-modifying device 111, for example, a user swipes his or her finger in direction A in the area 621 until the desired percentage deployment (50 percent in the example shown) is reached. Alternatively, the user may use adjustment arrows 622 to incrementally change the percentage deployment. When the percentage deployment of the port wake-modifying device 111 is changed, the controller drives the linear actuator 510 of the port wake-modifying device 111 to move the port wake-modifying device 111 to the set position. The starboard wake-modifying device 112 and the center trim tab 20 are adjusted in the same manner.

Another exemplary touchscreen 660 is shown in FIG. 109. In this example. one pair of wake-modifying devices (e.g., the wake-modifying devices 111, 112 of the first embodiment) are mounted to or near the transom 122, another pair (e.g., the wake-modifying devices 902, 904 of the fifth embodiment) are mounted to or are part of the platform 700, and the center trim tab 20 is mounted to the transom 122. Here, the percentage deployment of wake-modifying devices 902, 904 of the fourth embodiment are displayed in an outline of the platform 700 to distinguish them from the percentage deployment of the wake-modifying devices 111, 112 and center trim tab 20 mounted to the transom 122. As with the touchscreen 610 shown in FIG. 107, the user selects the “TABS” button 612 to adjust the deployment of the wake-modifying devices (e.g., 111, 112, 902, 904) or center trim tab 20. Selecting the “TABS” button 612 displays an “EDIT TABS” screen 670 as shown in FIG. 110. Here, all four wake-modifying devices (e.g., 111, 112, 902, 904) and the center trim tab 20 may be adjusted. This touchscreen 670 may be operated similarly to the “EDIT TABS” screen 620 shown in FIG. 108. As with touchscreen 650, the percentage deployment of the wake-modifying devices 902, 904 of the fourth embodiment are displayed in an outline of the platform 700 to distinguish them from the wake-modifying devices 111, 112 and center trim tab 20 mounted to the transom 122. In the example shown, the user has edited the percentage deployment of the wake-modifying devices using area 621 or adjustment arrows 622 until the starboard wake-modifying device 112 of the first embodiment is set to 80 percent and the port wake-modifying device 902 of the fifth embodiment is set to 10 percent, thus shaping the wake for wake surfing on the port side of the boat 100.

As another option, the wake-modifying devices, ballast, and boat speed may be controlled using user-defined programmed settings. A user can manually set each of the parameters in the manual mode as described above and then save these settings as a user-defined profile. In operation, a touch location 610, shown in FIG. 111, may be used to toggle between these user-defined programmed settings. In this embodiment, a user toggles between settings by swiping touch position 614 to the left or right.

In addition to or instead of the foregoing, the control system can include preprogrammed settings established by the boat manufacturer. After one of the preprogrammed settings has been selected by a user, a cruise control screen 630 may be displayed, such as shown in FIG. 111. The boat may be set to cruise at a specific speed by selecting the “ON” button 632. If the user desires to switch between preprogrammed settings, the user may select the “SWITCH” button 631. Selecting the “SWITCH” button 631 causes a pop-up window to be displayed within the control screen 640, such as shown in FIG. 112. Using the pop-up window, the user may select a different preprogrammed setting. In this embodiment, four preprogrammed settings are shown and are applicable to the examples described above whether a pair of wake-modifying devices 111, 112, 802, 804, 902, 904, 1002, 1004, 1102, 1104 are used individually or in combination with other wake-modifying devices or means to modify the boat's wake. Where the controller is controlling a pair of wake-modifying devices (e.g., 111, 112) attached to or near the transom 122, the two “mellow” settings (“SURF LEFT MELLOW” 641 and “SURF RIGHT MELLOW” 643) may be programmed such that the controller drives the linear actuator 510 to deploy the wake-modifying device 111, 112 on the non-surf side to a relatively shallow deployed position. The two “steep” settings (“SURF LEFT STEEP” 642 and “SURF RIGHT STEEP” 644) may be programmed to maximize the size of the wake. In these “steep” settings, the controller drives the linear actuator 510 to deploy the wake-modifying device 111, 112 on the non-surf side to the maximum deployed position. Where the controller is controlling a pair of wake-modifying devices (e.g., 902, 904) that are mounted on or a part of the platform 700, the controller similarly drives the linear actuators to deploy the wake-modifying devices to the set percentage deployment, but the linear actuator 510 on the surf side of the boat 100 is driven. In addition to or instead of a touchscreen, other known input devices, such as static buttons 650, can be used.

The embodiments described and shown herein are examples of preferred embodiments of the present invention and are provided for illustrative purposes only. They are not intended to limit the scope of the invention. Although specific configurations, structures, materials, etc. have been shown and described, such are not limiting. Modifications and variations are contemplated within the scope of the invention, which is to be limited only by the scope of the claims.

Claims

1. A recreational sport boat comprising: a hull including starboard and port sides and a transom;a generally horizontal platform extending aft from the boat and spanning from a port side to a starboard side of a centerline of the boat, the platform having a centerline, an underside, a leading edge, a trailing edge, a port edge, and a starboard edge; anda pair of wake-modifying devices on the underside of the platform, one of the wake-modifying devices being positioned on a port side of the centerline of the platform and another of the wake-modifying devices being positioned on a starboard side of the centerline of the platform, each wake-modifying device having a surface that is downwardly sloped in a direction from the leading edge of the platform toward the trailing edge of the platform, the wake-modifying device on the port side of the centerline of the platform having a surface that is downwardly sloped in a direction from the centerline of the platform toward the port edge of the platform, and the wake-modifying device on the starboard side of the centerline of the platform having a surface that is downwardly sloped in a direction from the centerline of the platform toward the starboard edge of the platform.

2. The recreational sport boat of claim 1, wherein, on the wake-modifying device on the port side of the centerline of the platform, the downwardly-sloping surface in the direction from the leading edge of the platform toward the trailing edge of the platform smoothly transitions to the downwardly-sloping surface in the direction from the centerline of the platform toward the port edge of the platform, and wherein, on the wake-modifying device on the starboard side of the centerline of the platform, the downwardly-sloping surface in the direction from the leading edge of the platform toward the trailing edge of the platform smoothly transitions to the downwardly-sloping surface in the direction from the centerline of the platform toward the starboard edge of the platform.

3. The recreational sport boat of claim 1, wherein each wake-modifying device has a leading face, the leading face being the surface that is downwardly sloped in a direction from the leading edge of the platform toward the trailing edge of the platform.

4. The recreational sport boat of claim 1, wherein the wake-modifying device on the port side of the centerline of the platform has a trailing face, the trailing face being the surface that is downwardly sloped in a direction from the centerline of the platform toward the port edge of the platform, and wherein the wake-modifying device on the starboard side of the centerline of the platform has a trailing face, the trailing face being the surface that is downwardly sloped in a direction from the centerline of the platform toward the starboard edge of the platform.

5. The recreational sport boat of claim 4, wherein each wake-modifying device has a leading face, the leading face being the surface that is downwardly sloped in a direction from the leading edge of the platform toward the trailing edge of the platform, and wherein the leading face and the trailing face of each wake-modifying device intersect.

6. The recreational sport boat of claim 5, wherein, on each wake-modifying device, the intersection between the leading face and the trailing face is rounded.

7. The recreational sport boat of claim 5, wherein an angle is formed between the leading face and the trailing face, the angle being from 100 degrees to 170 degrees.

8. The recreational sport boat of claim 7, wherein the angle between the leading face and the trailing face is from 140 degrees to 160 degrees.

9. The recreational sport boat of claim 1, wherein each wake-modifying device is pivotable between a first position and a second position in which the wake-modifying device is angled downwardly at an angle greater than it is in its first position.

10. The recreational sport boat of claim 1, wherein each of the wake-modifying devices is stationary relative to the generally horizontal platform.

11. A recreational sport boat comprising: a hull including starboard and port sides and a transom; anda platform assembly extending aft from the boat, the platform assembly including: (a) a generally horizontal platform spanning from a port side to a starboard side of a centerline of the boat, the platform having a centerline, a leading edge, a trailing edge, a port edge, and a starboard edge; and(b) a port-side wake-modifying surface and a starboard-side wake-modifying surface provided on an underside of the platform, each of the port-side wake-modifying surface and the starboard-side wake-modifying surface having a downward slope in a direction from the leading edge of the platform toward the trailing edge of the platform,wherein a cross section of the platform assembly taken perpendicular to the centerline of the platform and passing through each of the port-side and starboard-side wake-modifying surfaces has a concave shape.

12. The recreational sport boat of claim 11, wherein the port-side wake-modifying surface is a leading face of a port-side wake-modifying device and the starboard-side wake-modifying surface is a leading face of a starboard-side wake-modifying device.

13. The recreational sport boat of claim 12, wherein each of the port-side wake-modifying device and the starboard-side wake-modifying device includes a trailing face.

14. The recreational sport boat of claim 13, wherein the trailing face of the port-side wake-modifying device is downwardly sloped in a direction from the centerline of the platform toward the port edge of the platform and the trailing face of the starboard-side wake-modifying device is downwardly sloped in a direction from the centerline of the platform toward the starboard edge of the platform.

15. The recreational sport boat of claim 11, wherein each of the port-side wake-modifying surface and the starboard-side wake-modifying surface is pivotable between first position and second position in which the wake-modifying surface is angled downwardly at an angle greater than it is in its first position.

16. The recreational sport boat of claim 11, wherein each of the port-side wake-modifying surface and the starboard-side wake-modifying surface is stationary relative to the generally horizontal platform.

17. A recreational sport boat comprising: a hull including starboard and port sides and a transom;a platform assembly extending aft from the boat, the platform assembly including: (a) a generally horizontal platform spanning from a port side to a starboard side of a centerline of the boat, the platform having a centerline, an underside, a leading edge, a trailing edge, a port edge, and a starboard edge;(b) a port-side wake-shaping surface provided on a port side of the centerline of the platform, at least a portion of an underside of the port-side wake-shaping surface having a convex shape; and(c) a starboard-side wake-shaping surface provided on a starboard side of the centerline of the platform, at least a portion of an underside of the starboard-side wake-shaping surface having a convex shape.

18. The recreational sport boat of claim 17, wherein at least a portion of each of the port-side and starboard-side wake-shaping surfaces has a downward slope in a direction from the leading edge of the platform toward the trailing edge of the platform.

19. The recreational sport boat of claim 17, wherein at least a portion of the port-side wake-shaping surface has a downward slope in a direction from the centerline of the platform toward the port edge of the platform.

20. The recreational sport boat of claim 17, wherein at least a portion of the starboard-side wake-shaping surface has a downward slope in a direction from the centerline of the platform toward the starboard edge of the platform.

21. The recreational sport boat of claim 17, wherein a cross section of the platform assembly taken perpendicular to the centerline of the platform and passing through each of the port-side wake-shaping surface and the starboard-side wake-shaping surface has a concave shape.

22. The recreational sport boat of claim 17, wherein each of the port-side wake-shaping surface and the starboard-side wake-shaping surface is pivotable between first position and second position in which the wake-shaping surface is angled downwardly at an angle greater than it is in its first position.

23. The recreational sport boat of claim 17, wherein each of the port-side wake-shaping surface and the starboard-side wake-shaping surface is stationary relative to the generally horizontal platform.

24. A recreational sport boat comprising: a hull including starboard and port sides and a transom; anda platform assembly extending aft from the boat, the platform assembly including: (a) a generally horizontal platform spanning from a port side to a starboard side of a centerline of the boat, the platform having a centerline, an underside, a leading edge, a trailing edge, a port edge, and a starboard edge;(b) a downwardly-sloping surface on a port side of the centerline of the platform, the port-side downwardly-sloping surface being sloped downwardly in a direction from the leading edge of the platform toward the trailing edge of the platform; and(c) a downwardly-sloping surface on a starboard side of the centerline of the platform, the starboard-side downwardly-sloping surface being sloped downwardly in a direction from the leading edge of the platform toward the trailing edge of the platform,wherein a cross section of the platform assembly taken perpendicular to the centerline of the platform and passing through each of the port-side and starboard-side downwardly-sloping surfaces has a concave shape.

25. The recreational sport boat of claim 24, wherein each of the port-side downwardly-sloping surface and the starboard-side downwardly-sloping surface is pivotable between first position and second position in which the downwardly-sloping surface is angled downwardly at an angle greater than it is in its first position.

26. The recreational sport boat of claim 24, wherein each of the port-side downwardly-sloping surface and the starboard-side downwardly-sloping surface is stationary relative to the generally horizontal platform.