The invention relates to a projectile having a projectile tip at the front, as seen in the direction of firing, which develops into a rear cylindrical area by way of an ogive.
Cartridges of the 0.22 LR caliber currently have a projectile with an ogive, whose surface is designed to be smooth without exception. The shape of the ogive represents an attempt to improve the trajectory properties of the projectile.
The object of the invention is to develop a projectile according to the preamble of claim 1, which will have a lower air resistance and an optimized precision.
This object is achieved according to the invention by the fact that the surface of the ogive is structured. It has surprisingly been found that even minor structuring of the surface will reduce the air resistance and optimize the precision of the projectile.
In a preferred embodiment, the surface has recesses. Recesses are easily created.
In a preferred embodiment, the recesses are droplet-shaped. The special droplet shape of the recesses on the ogive produces positive changes in the air resistance of the projectile. This leads to an elongated and more uniform trajectory and thus improves the precision.
The recesses are preferably arranged on circles, which encompass the ogive and are arranged perpendicular to the longitudinal axis of the projectile, wherein the recesses are preferably arranged so they abut against one another on the circles. The recesses are then arranged so that the resulting air turbulence is added and subtracted, so that an optimal flow resistance coefficient Cw value is achieved.
This situation can be further improved if the recesses are arranged so they are also on a circle in relation to the recesses on a neighboring circle, so that one recess is arranged on the circle between two recesses on a neighboring circle.
This can be further improved if the recesses on one circle are arranged so they are offset from the recesses on a neighboring circle, so that a recess on one circle is arranged between two recesses on a neighboring circle.
The optimum approach is when the recesses on one circle are arranged with an offset from the recesses on the neighboring circle, amounting to half the diameter of one recesses. This embodiment is illustrated in the figures, which are described below.
Four circles are preferably provided on the ogive.
In a preferred embodiment, peripheral grooves running parallel to the circles are arranged on the cylindrical area beneath the recesses in the direction away from the tip of the projectile. The grooves in the cylindrical area have the task of optimally deflecting the air stream, which is generated by the droplet-shaped recesses around the projectile. The projectile is therefore also much less sensitive to weather influences such as wind and rain or snow.
In a preferred embodiment, the surface of the tip of the projectile is designed to be smooth, and a calming zone is arranged beneath the recesses in the direction away from the tip of the projectile as far as the grooves, where the surface of this calming zone is smooth. Turbulence develops in these regions. There is a calming effect on the air flow due to their smooth surfaces.
The use of the projectile according to the invention for cartridges of the caliber 0.22 LR is preferred, in particular for rim-fire cartridges.
The invention is explained in greater detail below on the basis of two figures.
These recesses 2 are droplet shaped, so that the largest diameter 5 is in the lower half of the droplet shape, i.e., it is situated away from the projectile tip 9. Starting from the tip of the droplet, which points in the direction of the projectile tip 9, the diameter of the droplet shape increases steadily up to the largest diameter 5 and then decreases steadily.
These recesses 2 are arranged on circles 4a, 4b, 4c, 4d (see
a shows schematically the circles 4a, 4b, 4c, 4d on the ogive 1 on which the recesses 2 are arranged. It can be seen here well that the recesses 2 are arranged on a circle 4a, 4b, 4c, 4d, so that they are offset radially from the recesses 2 on the neighboring circle 4a, 4b, 4c, 4d. The recesses 2 in
Grooves 8 running parallel to the circles 4a, 4b, 4c, 4d are arranged on the cylindrical region 7 below the recesses 2 in the direction away from the projectile tip 9.
The air resistance of the basic projectile is altered in a positive sense due to the special droplet shape of the recesses 2 on the ogive 1 of the projectile. This leads to an elongated and more uniform trajectory and therefore improved precision. The recesses 2 are arranged in such a way that the resulting turbulence can be added and subtracted, thus achieving an optimal Cw value.
The grooves 8 situated in the cylindrical region 7 are designed so that they optimally deflect the air stream, which is created due to the droplet-shaped recesses 2, around the projectile. This makes the projectile much less sensitive to weather influences such as wind or rain and snow.
The region in which the turbulence occurs is defined so that the projectile tip 9 is smooth, i.e., it has no recesses there and there is a calming zone 10 between the recesses 2 and the grooves 8, having a smooth surface and contributing toward the calming of the air flow.
Number | Date | Country | Kind |
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10 2011 109 666.7 | Aug 2011 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2012/065435 | 8/7/2012 | WO | 00 | 2/7/2014 |