DE2155467C3 - KurzbahngeschoB - Google Patents

Description

30th

The invention relates to a short-range projectile for training purposes, which after firing the same has ballistic properties like the corresponding normal bullet, with a separable in the flight path, projectile tip held in a central blind hole of the Ge lap body, the one Cavity for receiving the back pressure causing the separation of the projectile tip.

In the DT-OS 19 05 294 a projectile is described, which also has a projectile body and a throwable Has bullet tip. The projectile tip protrudes with its approach into a hole in the projectile body. The projectile tip has a cavity in which the through the central hole in the projectile body penetrating propellant gases and throw off the projectile tip from the projectile.

It is a disadvantage of this device that the projectile tip is still during the passage of the Projectile is thrown through the barrel or shortly thereafter, reducing the trajectory of the projectile from Is changed at the beginning.

It is the object of the present invention to provide a short-course projectile, which during a certain trajectory has the same ballistic properties as the corresponding normal projectile and then suddenly braked.

According to the invention this object is achieved in that the cavity of the projectile tip at the front with a melting due to the temperature increase due to the air resistance in the braking zone of the trajectory Material is sealed and the projectile tip is designed so that it is through the air expression in the cavity is caused to burst and separate from the projectile body.

Another short-course projectile of this type is already known from DT-PS 7 34 429, which is also known has the same ballistic properties as the corresponding one up to a certain point in time Normal projectile and its ballistic properties then suddenly change in such a way that the trajectory of the projectile is greatly shortened. This floor is formed by a column of sheet metal disks, which on a Central spine are attached. Before firing, the central spine is held in the seat by bullets, which Bullets are then pressed into a cavity when fired, thereby releasing the central spine will. A spring tends to push the central spine out of the projectile in the direction of flight. The air resistance on the other hand, pushes the central spine back against the bottom of the projectile.

Only with such a reduction in the speed of the projectile, at which the air pressure is less than the spring pressure. if the central spine is pushed out, and the individual parts of the projectile fall apart.

It is a disadvantage of this projectile that a lot of components are used to separate the projectile tip is required, making the production of the bullet a considerable expenditure of time and money requires.

An exemplary embodiment is shown in the drawing and is described in more detail below. It indicates

Fig.! a longitudinal section through the KurzbahngescUoss,

FIG. 2 shows the short-course projectile from FIG. 1, however without protective hood and plastic jacket when flying in the operational area,

F i g. 3 the short-course storey from FIG. 2, without the detached bullet tip during flight in the braking zone.

According to FIG. 1, a projectile body 1 is provided at its front end with an axial blind hole 2, in which four mutually perpendicular radial bores 3 open. The projectile body 1 has a front annular end face 4 on which a projecting into the blind hole 2 projectile tip 5 with a paragraph 6 rests. The projectile tip 5, which tapers to a front end 8, points in its interior one to the rear to the blind hole 2 more open. Cavity 7. The hollow projectile tip 5 is off a material that melts due to air resistance during flight of the projectile, in the present case plastic, manufactured. The projectile body 1 is surrounded by a plastic jacket 9, which at its rear Has a guide and sealing tape 10 at the end. A protective hood 11 envelops the projectile tip 5 and the front end of the projectile body 1 and is fastened in an annular groove 12 of the plastic jacket 9.

In Fig. 2 shows the projectile in flight in the operational area, the air L occurring on the projectile tip 5 resulting in a stagnation point P and the streamlines Si and S2 . F i g. 3 shows the projectile in the braking zone, the unfavorable flow conditions being represented by streamlines S3 and Sa.

After the launch, when the short-range projectile has left the barrel, the protective hoods 11 and the plastic jacket 9 are separated from the projectile body 1 by the centrifugal force. The projectile now has a favorable, low-resistance outer shape with the projectile tip 5, with streamlines Si and S2 resulting (see FIG. 2). At the stagnation point P , the front end 8 of the projectile tip experiences a temperature increase as a result of the air resistance, which, for example, at a projectile speed of approximately 1300 m / s

850 ° C and melts the tip of the bullet. The wall thickness of the hollow projectile tip 5 is dimensioned so that melting through in the area of use is avoided, d. h "arranged or that the optimal bullet shape is retained in the area of application.

When the projectile enters the braking zone, the melting process has progressed so far that the front end 8 of the projectile tip 5 is pierced through. The resulting opening causes the stagnation point P to be shifted backwards into the cavity 7. The pressure increase thus currently effective in the cavity 7 causes the projectile tip 5 to burst and separate from the projectile body 1. The air L flowing into the blind hole 2 is through the radial Bores 3 deflected outwards, being on the outer surface of the projectile body

'5 forms a turbulent flow. Due to the very poor flow conditions, as shown in FIG. 3 are shown with the streamlines 53 and S * , the air resistance is greatly increased! The projectile body is now braked very quickly, so that the flight path is greatly shortened.

In the described embodiment of the invention, the four radial bores 3 are arranged perpendicular to one another or, to put it another way, they are arranged symmetrically with respect to a plane running through the longitudinal axis A of the projectile. In the case of an asymmetrical arrangement of at least two radial bores with respect to the plane mentioned, the stability of the projectile body is additionally disturbed in the braking zone, which is thereby stimulated to oscillate, so that the flight path is shortened even more.

For this purpose 3 sheets of drawings

Claims (3)

Patent claims: 1. Short-range bullet for training purposes, which has the same ballistic properties when fired has like the corresponding normal bullet, with a separable in the trajectory, in a central blind hole of the projectile body held projectile tip, which has a cavity for Receipt of the back pressure causing the separation of the projectile tip, thereby characterized in that the cavity (7) of the Projectile tip (5) at the front with an in the braking zone of the trajectory melting material is closed and the bullet tip (5) so is designed that by the Lut'tausdruck in the cavity (7) to burst and to separate from Projectile body (1) is brought. 2. Short course projectile according to claim 1, characterized in that in the blind bore (2) at least a radial bore (3) opens for the generation of braking air eddies. 3. Short course projectile according to claim 2, characterized in that four radial bores (3) are arranged evenly distributed around the circumference.