This invention relates to an improvement in sail raising, dousing, and stowing. It allows these operations to be carried out single-handed from the safety of the cockpit. The sail shape can be controlled continuously at any position as the sail is raised and lowered, offering a much wider range of sail configurations to suit wind conditions. The sail can self-fold/pleat neatly on top of the boom as lowered, ready to be covered.
A conventional main sail set-up in the representative form of Bermudan rig 1 is shown in
Sail handling further involves operations such as partially lowering and reefing sail 4 when underway. This reduces the effective size of the sail 4 for de-powering depending upon wind conditions. As sail 4 is lowered, the sail tends to fold, collapse, or otherwise lose its shape unless tension is maintained along leech 7. Conventionally, leech tension is restored by tying off reef points 12 at boom 3. Sail 4 may include one or several lines of reef points 12. For purposes of illustration, sail 4 includes a single line of these.
The lowering of sail 4 typically requires at least one crew member to be on the deck in any weather conditions to fold/pleat or otherwise gather the sail 4 manually along the boom 3 and then tie it down using sail ties via the reef points 12. This operation has been awkward at least and often is dangerous in a rising sea and in windy conditions. Sail lowering also is a difficult and risky activity when sailing short handed, especially single-handed. This method of sail lowering also is uncontrolled, relying mainly on gravity. The loose sail itself is a hazard and may injure or knock crew overboard, block the view, fall onto the deck affecting the performance of other duty, and/or fall overboard into the water.
The lazy jack systems (not shown) are an inexpensive way to control a main sail and boom when lowering a sail. A wide variety of lazyjack systems are known, but all generally are intended to help support the main sail up on the boom, out of the way, until the sail is folded and covered. Lazy jacks are effective for fully battened sails. U.S. Pat. No. 4,741,281, for example, uses lazy jacks to guide the sail when it is lowered and uses a sail cover (bag) to catch the sail. U.S. Pat. No. 5,327,842 constructs a multiple-line lazy jack on each side of the sail to form essentially a basket or nest to effectively catch the sail as the sail is lowered. Inconveniently, the height of the lazy jack lines of this system are not self adjusted with the falling sail. The sail also lacks a self-flaking system. This highlights a drawback of the lazyjack systems in that the sail still needs to be folded/pleated manually along the boom.
The roller furling system offers another way to manage sail handling. In these systems, a sail can be furled around a mast or boom. These furling systems have been described, for example, in U.S. Pat. Nos. 6,371,037 and 4,057,023. Both forms of this technology, boom furling or mast furling, are relatively convenient to use. They do not require crew to leave the cockpit to operate. However, they are expensive, require complete replacement of the existing rigging system, and they affect sail shape especially in light air. In addition, furling is not as suitable as might be desired for battened sails.
Other sail handling systems are also known. U.S. Pat. No. 4,688,506 uses two or more lines threaded back and forth through vertically aligned rings in the sail to fold and hold the sail on to the boom when it is lowered. This system is for a fully battened sail and requires sail cover modification.
U.S. Pat. No. 5,119,750 uses luff shackles and leach flaking devices to pleat the sail. U.S. Pat. No. 4,864,952 flakes the sail using brailing lines to suspend the sail leech to the topping line. However, these two systems lack a mechanism to prevent side blowing of the sail when not tied to the boom.
This invention provides a sail handling system and associated methods for sail raising, dousing, and stowing when operating sail-powered craft. The present invention allows these operations to be carried out single-handed from the safety of the cockpit in a wide range of wind and water conditions. The sail can self-fold/pleat neatly on top of the boom when lowered, ready to be covered. Preferred embodiments of the system incorporate one or more self-adjusting lazy jacks. The system is useable for many types of sails, including fully battened, short battened, no battens; main, jib, Bermudan or Marconi rigs, lug sails, sprit rig sails, combinations of these, and others.
The system may be easily fit onto new or existing rigging systems without alteration of existing rigging. In other words, the system adds to, but need not supplant existing rigging components. This invention is non-intrusive to conventional sailing activity, i.e. friendly to conventional sail reefing operation. Thus, this invention can be seamlessly employed or detached with no impact on the normal sail operation. This invention is simple, easy to handle, economical, and light weight.
In one aspect, the present invention relates to a sail handling system comprising at least one control line routed along a leech and a head of a sail in a manner such that a tension on the at least one control line helps to support the leech and exerts a downward force on the sail head.
In another aspect, the present invention relates to a sail head bridge. The bridge includes at least one bar member and at least one block attached to the bar member. Bridge is attached to a head of a sail in a manner such that the bridge moves up and down with the sail head.
In another aspect, the present invention relates to methods of using the sail handling system and/or the bridge for sail handling.
a though 4d show how a control line is incorporated into the sail handling system of
a and 5b show how sail lowering is carried out using the modified Bermudan rig of
a shows an alternative embodiment of a sail handling system of the present invention incorporated into a Bermudan main sail rig that includes additional side rope rails/lazy jacks and sail catching rope nests/baskets on each side of the sail.
b shows the sail head bridge used in the sail handling system of
a shows an alternative embodiment of a sail handling system of the present invention incorporated into a Bermudan main sail rig invention that uses multiple control lines.
b shows the sail head bridge used in the sail handling system of
a shows an alternative embodiment of a sail handling system of the present invention incorporated into a Bermudan main sail rig invention that uses multiple control lines with additional side rope rails/lazy Jacks and side sail catching rope nests/baskets on each side of sail.
b shows the sail head bridge used in the sail handling system of
a shows an alternative embodiment of a sail handling system of the present invention incorporated into a Bermudan main sail rig using additional side rope rails/lazy Jacks and side sail catching rope nests/baskets on each side of sail.
b shows the sail head bridge used in the sail handling system of
The embodiments of the present invention described below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following detailed description. Rather the embodiments are chosen and described so that others skilled in the art may appreciate and understand the principles and practices of the present invention.
The present invention can be used to enhance sail handling and control of a wide range of sailing rigs. For purposes of illustration,
System 20 also includes an optional, but preferred, lazy jack functionality that helps to gather and support lowered portions of the sail 28 at the boom 26. As the sail is lowered, the folds, or pleats, of sail 28 gather in “rope baskets” provided by the system 20. The lazy jack functionality is self-adjusting, and, therefore, is retained regardless of sail position.
System 20 is easy to fit or retrofit onto a new or existing rig 22, as its hardware and rigging components are easily attached to rig 22 with minimal modifications being required. Advantageously, the sail handling system 20 is fit or retrofit to a new or existing rig without any alternation of the original rigging. The system can be used with a wide variety of sails, including main, jib, or other sails that are full, short, battened, boomed, boomless, batten-less, and the like. The system does not interfere with sail shape, but rather helps maintain useful sail shape over a wider range of positions than is available with conventional rigs. Thus, system 20 is simple to implement as well as simple to use.
In more detail, system 20 includes a bi-directional, auto stopping winch 52 that is used for taking in and paying out a portion 53 of leech tension control line 54 from the safety of the cockpit (not shown) while raising or lowering the sail 28. The bi-directional auto-stop winch 52 helps to take in and pay out the control line 54 and provide suitable tension to the line to prevent it from tangling up. Winch 52 is conveniently mounted to a deck or cockpit top. The attachment is desirably reinforced sufficiently to handle loads from line 54. Deck block 55 takes the control line 54 from winch 52 and sends the line upward to the sail head bridge 56. Sail head bridge 56 advantageously moves upward and downward with head 40 of sail 28 and serves as a dynamic control point for rigging lines to be routed to and from sail head 40 regardless of the hoisted position of sail head 40. The ability of bridge 56 to follow head 40 up and down is an important factor in maintaining leech tension as well as in allowing the lazy jack functionality to be self adjusting. Preferably, therefore, sail head bridge 56 is most desirably attached to sail head 40, although bridge 56 could be slidably coupled to mast 24. Aft boom block 58 redirects the control line 54 from boom elevation upward to the head bridge 56. Terminal 60 is used to fasten the fixed end of the control line 54. Blocks 62 and 64 are hardware constituents of the self adjusting, lazyjack functionality. These blocks 62 and 64 are attached to lines 66 and 68, respectively. Lines 66 and 68, in turn, are attached to boom 26. Rope baskets are thus formed at least in part by lines 66 and 68 on each side of boom 26 for gathering lowered portions of sail 28 as will be described further below.
Leech hanks 67 are attached to leech 34 and help guide line 54 along leech 34. As shown in the Figures, the leech hanks 67 desirably are long enough to let the sail 28 take its shape freely when loaded with wind. On the other hand, leech hanks 67 are desirably short enough to confine the leech movement when the sail 28 is loose. By way of example, leech hanks 67 having a length of 15 cm have been found to be suitable for an exemplary sail have an area of 140 ft2, a foot having a length of 10 ft, a luff having a length of 28 ft. and a leech having a length of 31 ft.
Preferably, each leech hank 67 is preferably matched to a corresponding luff hank 46 so that each leech hank 67 and luff hank 46 of a corresponding pair are at the same height above boom 26. In other words, an imaginary line connecting each leech hank 67 and its corresponding luff hank is preferably parallel to boom 26 when a portion of sail 28 including the pair is raised. This correspondence is shown by the interconnecting dotted lines among corresponding hanks 67 and 46 in the Figures. This correspondence greatly facilitates self-folding/pleating of the sail 28 as sail 28 is lowered.
a through 4d best illustrate how sail handling system 20 is rigged. As will become apparent from the following discussion, control line 54 advantageously performs many functions within system 20. Referring first to
As shown in
As shown in
As shown in
Another rope rail is formed by portions of line 54 that extend along leech 34 in the preferred embodiment. This rail confines the movement of the leech hanks 67 at all times. This rail also helps to prevent the leech 34 from falling away from the boom 26 when the sail 28 is lowered.
System 20 is easy to use and most if not all sail handling operations can take place single handed from the safety of the cockpit.
Referring now to
For reefing, the sail 28 is only partially lowered. Also, more tension is maintained in line 54 in order to tension the leech appropriately and thereby establish good sail shape in the reefed sail. If sea conditions require reefing, the reef points 33 are fastened to the boom 26. Because the pleated sail 28 is well supported by its rope supports, this is safer to do than with a conventional sail rig.
Raising the sail 28 is also simple. One uses the halyard 42 to pull up the head 40 of the sail 28 while letting the winch 52 pay out the control line 54. As the sail 28 gradually moves up, the control line 54 is extended accordingly. The auto stop mechanism of the winch 52 can maintain a proper level of tension on the control line 54. This helps to avoid having an excessive amount of line 54 foul or otherwise entangle the sail 28 or other hardware or rigging. In short, the system 20 of this embodiment allows sail raising to occur in a conventional manner and its presence is transparent to the user. On the other hand, if in some urgent situations the sail 28 needs to be lowered quickly, the only task that needs to be done is to release the halyard 42 and let the sail 28 drop. There is no need to deal with the control line 54 at that moment and it will fall together with the sail 28.
In order to test the operability of the invention, the Bermudan main sail of a MacGregor 26 sailboat was rigged in accordance with the principles of system 20 described herein. Sail raising and lowering were performed successfully from the cockpit in 15 to 20 knots windy conditions.
An alternative embodiment of a sail handling system 120 is shown in
The modified bridge 156 is seen best in
In this embodiment, control line 154 still goes through blocks 155, 176, and then 162. However, instead of going back directly to aft boom block 158 as was the case for system 20, line 154 goes up to block 190 on the bridge 156 and comes back down toward block 169 to form one more lazyjack on the starboard side of the sail 128. Leaving block 169 and 158, line 154 turns back up and goes through the leech hanks 167 to arrive at block 178 to complete the leech rail as before.
On the port side of the sail 128, line 154 comes down from block 178. Line 154 goes through block 164 and turns back up to block 191 to form a first lazy jack. Line 154 comes down from block 191, goes through block 171, and then terminates at terminal 160 to finish the second lazy jack and the rope rail. With one more lazy jack on each side and the resultant denser rope nest, the system 120 can catch/gather sail 128 on the boom 126 more effectively.
Instead of using a single control line 54 or 154, multiple control lines can be used. Such an alternative embodiment of a sail handling system 220 fitted to rig 222 is shown in
The modified bridge 256 is shown in
One can see in
The embodiment of system 320 shown in
More specifically, port control line 357 goes through deck block 359, then through block 379 on the bridge 356, and then through block 364 to form the first lazy jack. Line 357 then goes up to mid bridge block 391 and comes back to lazy jack block 371 to form the second lazyjack. From block 371, line 357 proceeds to aft boom block 358. From block 358, line 357 ends at attachment 378 after passing through all or part of leech hanks 367. Hence, line 357 finishes the port side formation of the rope rail and the leech rail system. Starboard control line 354 is routed through winch 352, blocks 355, 376, 362, 390, 369, and 358, leech hanks 367, and is secured at attachment 378 in a similar fashion.
Another embodiment of a sail handling system 420 is shown in
Other embodiments of this invention will be apparent to those skilled in the art upon consideration of this specification or from practice of the invention disclosed herein. Various omissions, modifications, and changes to the principles and embodiments described herein may be made by one skilled in the art without departing from the true scope and spirit of the invention which is indicated by the following claims.
The present non-provisional patent Application claims priority under 35 USC §119(e) from U.S. Provisional Patent Application having Ser. No. 60/649,940, filed on Feb. 4, 2005, by Ma and titled SIMPLE BUT EFFECTIVE SAIL HANDLING SYSTEM THAT ALLOWS SAIL CONTROL TO BE CARRIED OUT SINGLE-HANDED FROM THE SAFETY OF THE COCKPIT, wherein the entirety of said provisional patent application is incorporated herein by reference.
Number | Date | Country | |
---|---|---|---|
60649940 | Feb 2005 | US |