CH658905A5 - Twist-stabilized practice floor. - Google Patents

Description

This invention relates to a spin-stabilized training projectile for flat-fire guns, in particular artillery cannons and cannons arranged on armored personnel carriers, in which the projectile emerges from the barrel at supersonic speed.

The general requirement for a practice bullet is that it is not only a cheap alternative to conventional war projectiles, but that it should have the same ballistic data as a war projectile within a limited firing distance and requires the smallest possible safety distance after the firing distance. This means that a training projectile within a first part of the trajectory, viewed in the direction of the target, must have ballistic properties which are very different from those of a second part of the trajectory. The second part of the trajectory runs in the security area, which must be available due to possible misses, which security area should be as small as possible.

Therefore, a small air resistance is required during the first part of the trajectory, which produces the same flat trajectory as is the case with a war projectile, whereas the air resistance during the second part of the trajectory should be large in order to keep the projectile as short as possible behind the Braking goal.

Because the range of the shooting range will change significantly depending on the training fire in relation to both the training area and the combat situation, it is desirable that training projectiles are available that can be adapted to large and small shooting ranges. It is obvious that it is cheaper to use one and the same practice floor for these different general target distances, not least in terms of storing it.

The aim of the invention is a practice floor that meets the requirements mentioned. The practice floor according to the invention is also characterized by the features of claim 1.

Thus, at the beginning of the trajectory, if it flies at supersonic speed, the training projectile can generate an air resistance which is completely different from that which it has at the end of the trajectory, where it is decelerated to subsonic speed.

As soon as the speed of the practice floor drops below a limit value, it can be slowed down quickly by an air resistance that is much greater than that which occurs on a conventional floor. Furthermore, it can be easily adapted to short shooting distances, which are for example due to small practice areas or very hilly terrain. The adjustment or modification of the projectile from a practice projectile with a large range to a practice projectile with a small range can be carried out simply by unscrewing the pin of the projectile from the cylindrical body. This can produce a short, crowded, frustoconical projectile which, despite poor ballistic properties and short range, is completely satisfactory for use in practice shooting with short trajectories. The pen can be extremely simple and because of this simplicity, it can have a small intrinsic value, so that it can be neglected.

The practice bullet thus comes as a spin-stabilized practice bullet for use in guns with a flat-shot trajectory, mainly artillery cannons, in which the bullet emerges from the barrel at supersonic speed.

Depending on the desired shooting distance, the diameter and length of the pin can be adapted to this depending on the shape and the area of the face of the body. It may therefore be desirable, for example, to design the part of the body which adjoins the end face in the form of a short, blunt cone, the elongated surface lines of which define an obtuse-angled triangle in axial section together with the base line.

In order to adapt the practice bullet to the two different shooting distances mentioned above, the pin can be designed to be easily removable, for which purpose only its rear end can be provided with a screw thread, which can then be screwed into a blind hole with an internal thread which can be screwed into the Middle of the front of the projectile body is arranged.

In this connection it should be mentioned that there are armor-piercing projectiles which are shaped-charge projectiles (projectiles which have charges whose explosive effect can be directed), the external shape of which is very similar to that of this invention. Although similar shaped charge projectiles are known for use with artillery guns in which the projectile emerges from the barrel at supersonic speed and also for other versions of recoil-free

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Guns and rocket guns in which the projectile leaves the launcher at considerably lower speeds are, without exception, projectiles which have a forward-projecting spacer, e.g. an impact sensor, which ensures that the charge detonates at a precisely defined distance from a respective armored surface, so that the blast channel that arises during the explosion has the greatest impact. The external shape of these designs of shaped charge bullets thus depends exclusively on the desired penetration force on armor and not on ballistic properties.

The subject matter of the invention will now be explained in more detail with reference to the drawings. Show it:

Fig. 1 is a side view of a practice floor according to the invention, and

Fig. 2 the same practice floor in section.

As can be seen from both figures, the projectile mainly consists of a one-piece projectile body 1 which is made of duralumin. The projectile body 1 is equipped with two rings 2 and 3, which are shrunk on s and has an annular seal 4.

A tracer charge 5 is screwed into the rear end of the projectile body.

The front end of the projectile body 1 is light, so that it has the shape of a low, but relatively wide, truncated cone-shaped pyramid. At the front end, the projectile body ends in a flat end face 6.

By unscrewing the tip 8, the practice projectile 15, which is described by the invention, can be converted from a practice projectile for large shooting distances to a practice projectile for short shooting distances.

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1 sheet of drawings

Claims (5)

658 905 PATENT CLAIMS 1. Swirl-stabilized training projectile for flat-fire guns, in particular artillery cannons and cannons arranged on armored vehicles, in which the projectile emerges from the barrel at supersonic speed, characterized in that the training projectile has a largely cylindrical body (1) with rings (2, 3) and Seals (A) is equipped, which are intended to face the inside of the barrel, and has a pin-shaped tip that protrudes forward from the body (1), the cylindrical part of the body (1) ending in an end face (6) and the Tip is formed as a cylindrical pin coaxial to the body (1), which protrudes forward from the end face (6) and has a considerably smaller diameter than the end face, that the length and the diameter of the pin are fixed in such a way that when the projectile is with Supersonic speed flies, the pin (8) the air stream flowing past the floor at an angle to the rear deflects past the end face (6), while, when the projectile flies at subsonic speed, the air flow follows the pin (8) and thus creates air vortices against the end face (6) and thus brakes the projectile quickly. 2. Practice floor according to claim 1, characterized in that the pin (8) with the body (1) is detachably connected. 3. Practice floor according to claim 1 or 2, characterized in that the body (1) has a flat end face (6). 4. Practice floor according to claim 3, characterized in that the body (1) at the end face (6) has the shape of a truncated cone, the elongated surface lines of which determine an obtuse-angled triangle in axial section together with the base line. 5. Practice floor according to one of claims 1 to 4, characterized in that the body (1) and the protruding pin (8) are made of a single piece of metal, for example duralumin.