SE445143B - ROTATION STABILIZED OVEN PROJECTIL - Google Patents

Description

8105348-0 z Since the exercise distance that is relevant in each particular case can vary considerably between different exercise occasions both with regard to the available exercise area and practiced combat, it is desirable to have access to exercise projectiles adapted partly to long and partly to relatively short target distances. . Of course, it will then be cheaper for storage technical reasons if one and the same exercise projectile can be adapted to these different general target distances.

The present invention now relates to an exercise projectile which in the normal case when adapted to long exercise distances exhibits markedly different air resistances during the beginning of the projectile trajectory, when the projectile runs at supersonic speed and during its end when the projectile is braked to supersonic speed. the exercise projectile according to the invention is namely designed in such a way that since its speed has fallen below a critical value, it is rapidly decelerated by an air resistance which is considerably greater than for a conventional projectile. Furthermore, it is easily adjustable so that it is also suitable for short training distances, for example at small firing ranges or strongly hilly terrain. The conversion from long-range practice projectile to short-range projectile is done so that a pin-shaped projectile tip is simply unscrewed from the substantially cylindrical projectile body. The result is a short stubbed projectile which, despite poor ballistic properties and short firing range, is completely satisfactory for shooting exercises at short firing distances.

The screwed-off pin-shaped projectile tip is so simple and as a result has such a low intrinsic value that it can be ignored in this context.

The invention can thus be defined as a rotation-stabilized exercise projectile for such direct-firing weapons, mainly artillery pieces and tank cannons, in which the projectile leaves the barrel at supersonic speed. The projectile according to the invention consists of a rear substantially cylindrical projectile body provided with commonly designed belts and seals and a projectile body projecting in front of this projectile coaxially in the form of a cylindrical pin with a substantially smaller diameter than the projectile body.

The length and diameter ratio of the pin is so chosen that when the projectile travels at supersonic speeds through the air, it diverts the air flowing around the projectile past the front surface of the rear cylindrical projectile body. The said front surface is further so designed in Poon auAmy 3 8105348-0 that this, since the deflection no longer works since the projectile's speed is slowed down further away in the runway, gives rise to strong air vortices which further slow down the projectile's flight.

The simplest way to achieve this is to design the rear projectile body with a sharply cut front surface which thus extends annularly around the attachment of the pin-shaped tip in the projectile body.

Depending on the firing width desired, the length and diameter of the pin tip are adapted to the shape and area of the front surface of the rear projectile body. For example, it may be desirable to give the part of the rear projectile body closest to the front surface the shape of a short guide pad cone with a small top angle.

In order to make the exercise projectile in question adjustable to the previously mentioned two different firing widths, the pin tip is easily dismantled simply by threading its rear part and screwing it into an internally threaded bottom hole centrally arranged in the front surface of the projectile body.

In this context, it may be justified to point out that there are armor-piercing so-called R S V projectiles (projectiles with charges with directed explosive action) with an external configuration that is similar to that of the invention. Although such RSV projectiles are available for artillery pieces, where the grenade leaves the barrel at supersonic speeds, as well as for various recoilless cannons and rocket weapons where the projectile leaves the launch device with significantly lower exit velocity, in all these cases these are projectiles equipped with a protruding spacer to ensure that the charge of the projectile detonates at the carefully matched distance from an armored surface which gives the detonating beam formed during the detonation of the charge maximum effect. The external configuration of such an RSV projectile is thus completely dependent on the armor-breaking effect that it is desired to achieve in the target and not on ballistic considerations. the exercise projectile according to the invention will now be somewhat further described in connection with some attached figures. It is defi- -._ .. ._. , .., -..- ~ .... -. ... vec -__ 8105348-0 ered in the appended claims.

Figure 1 shows in the side projectile an exercise projectile according to the invention, while Figure 2 shows the same projectile in a sectioned side projection.

The projectile according to these two figures consists of a rear substantially cylindrical solid projectile body 1 made of dural.

The projectile body 1 is equipped with two crimped annular belts 2 and 3 and a rear annular seal 4.

In the rear part of the projectile body there is a built-in spotlight kit 5.

The front end of the projectile body 1 is slightly tapered so that this part takes the form of a low but relatively wide stubbed pyramid. Forwards, the projectile body ends with a sharply cut end surface 6.

In the center of this there is an axially internal threaded bore 7 in which the rod-shaped or cylindrical tip 8 projecting in front of the end surface 6 is threaded.

By unscrewing the tip 8, the exercise projectile according to the invention is converted from an exercise projectile for long firing distances to one for short firing distances.

Claims (3)

5 8105348-0 PATENT CLAIMS 1. Rotation-stabilized exercise projectile for such direct-firing weapons, mainly artillery pieces and tank cannons in which the projectile leaves the barrel at supersonic speed consisting of girders (2 and 3) and seals (4) against the barrel's inner surface rear projectile body (1) which is terminated at the front by a more or less sharply cut front surface (6) from which an axially arranged pin-shaped cylindrical tip (8) with a substantially smaller diameter than the front surface protrudes, characterized in that said tip (8) is releasably attached to the projectile body (1), whereby the projectile can be adapted to short firing distances by disassembling the tip (8) after having previously been adapted to long firing distances with the mounted tip (8). 2. A rotationally stabilized exercise projectile according to claim 1, characterized in that the rear cylindrical projectile wedge body (1) has the shape of a truncated cone with a small apex angle terminated with a sharply cut end surface (6). Rotation-stabilized exercise projectile according to any one of claims 1 or 2, characterized in that its two parts, the rear cylindrical projectile body (1) and the pin-shaped tip (8) projecting therefrom are made of solid material such as the dural and that the pin-shaped tip (8) ) against the projecting end of the projectile body (1) is provided with an external thread and is screwed into a threaded hole arranged in the projectile body.