GB2317942A

GB2317942A - Ballistic training projectile

Info

Publication number: GB2317942A
Application number: GB9720711A
Authority: GB
Inventors: Erich Bock
Original assignee: Diehl GmbH and Co
Current assignee: Diehl Verwaltungs Stiftung
Priority date: 1996-10-02
Filing date: 1997-10-01
Publication date: 1998-04-08
Anticipated expiration: 2017-10-01
Also published as: GB2317942B; FR2754052B1; DE19640707A1; FR2754052A1; GB9720711D0

Abstract

An inexpensive, ballistic training projectile 1, with indicator charge 7 emerging from the base side, ensures that on the one hand the target impact is very visible, on the other hand the body 15 of the projectile and the fittings 9,41,33 survive as a unit on target impact and are not broken up into splinters or separate parts. The charge 7 is contained in a tube 9 and is ignited by a fuze 3 via a propagation charge 5 and canal 19. There is a space between the tube 9 and projectile body 15 and between the charge 5 and canal 19.

Description

1 2317942 BALLISTIC TRAINING PROJECTILE The invention relates to a

ballistic training projectile.

A training projectile for medium to large-calibre barrel (or tube) weapons is known from German Patent Application 195 46 049 which is not previously published.

This training projectile has the same external ballistics as a live projectile of the same calibre. The point of impact of the training projectile is marked by a marking cloud. The marking cloud emerges from the base side of the projectile so that the earth displaced on impact does not hinder the effectiveness of the marking cloud. This training projectile has a nose fuze with a small propagation charge (or primer charge), an indicator or making charge located in a central tube, and a base which can be ejected by means of the indicator charge. The structure of the projectile ensures that no projectile fragments are produced on impact. Therefore the body of the projectile does not break up.

The invention is based on the objective of further simplifying the aforementioned training projectile, whereby the marking effect should be even more effective.

According to the present invention there is provided a ballistic training projectile for medium- to largecalibre barrel or tubular weapons comprising a nose fuze with propagation charge, an indicator charge in a central 2 tube held by its base end, a body with an ejectable base, and, between the propagation charge and the indicator charge, a detonating canal proximal to the central tube, there being an annular space between the projectile body and the tube, characterised in that an expansion chamber is provided between the propagation charge and the detonating canal.

According to the invention, a standardised and 10 therefore inexpensive fuze can be used. The central tube, which is substantially shorter when compared with the above prior art, and can be simply f ixed in the body of the projectile to give further saving of costs.

The expansion chamber, between the propagation charge and the detonating canal, optionally containing an ignition charge, as well as the annular space between the central tube and the body of the projectile ensure the necessary expansion of the gases of the propagation charge. The construction and the strength of the body of the projectile and of the structural components inserted for holding the indicator charge are therefore not adversely affected.

It is preferably ensured by means of a deflector at the front end of the tube that the explosive pressure does not rip open the body of the projectile nor does it destroy the tube containing the indicator charge.

3 The tube is preferably completely filled with the indicator charge.

The detonating canal is preferably located in the deflector for deflection of the gases and smoke produced by the explosion of the detonator, and the deflector is preferably connected with the end of the tube which is proximal to the tube, or the tube by way of the deflector, is supported against the body of the projectile by at least one gas permeable transverse support.

A perforated centering disk preferably serves as the transverse support and is located on a stem of the deflector and preferably rests in a groove in the body of the projectile with stop on the side of the groove nearest to the fuze.

The tube is preferably firmly connected on at its base end with an intermediate piece inserted in the body of the projectile and the ejectable, disk-shaped base is preferably mounted in the intermediate piece of the tube.

The deflector is preferably flush with the outer diameter of the tube, and the deflector is also formed over the greatest part of its length as a cone.

The deflector preferably has a stem at its fuze proximal end an which the transverse support is mounted so 4 that a base-facing side of the support abuts a stop on the deflector.

The transverse support is preferably in the form of a perforated centering disk.

The invention will be described further, by way of example with reference to the accompanying diagrammatic drawings, wherein:- FIGURE 1 shows a longitudinal section through a ballistic 10 training projectile; FIGURE 2 shows an enlargement of the detail II encircled in chain broken ring in FIGURE 1, and FIGURE 3 shows a partial cross-section on the line III-III in FIGURE 1.

A ballistic training projectile 1 consists of a commercially available nose fuze 3 with a large propagation charge 5 consisting of approximately 20 g tetryl, an enclosed indicator charge 7 in a central tube 9, a projectile body 15 with an ejectable base 17 as well as rotating (driving) band 16 and an annular space 23 between the projectile body 15 and the tube 9. The indicator charge 7 fills the entire inner space of the tube 9.

Between the detonator 5 and the indicator charge 7, there is a central, tubular detonating canal 19. The detonating canal 19 optionally contains a pyrotechnical ignition charge 21. The function of the projectile is also ensured without an ignition charge 21; the detonating canal 19 is sufficient. The detonating canal 19 lies in a deflector 31 for gas and smoke produced by the explosion.

The deflector 31 is located at the front (fuze proximal) end of the tube 9 and is ring welded with this at 11.

The base end of deflector has the same outer diameter 10 as the tube 9. Furthermore it has a cone 34 with a stem 35 at the front (fuze proximal) end for holding a perforated centering disk 33. The centering disk 33 supports the deflector 31 and consequently the tube 9 against the inner wall of the projectile body 15. For this purpose, the centering disk 33 engages in a groove 37 in the projectile body 15 and rests against a stop 39 an the fuze proximal side of the groove.

Between the centering disk 33 and the fuze 3, there is an expansion chamber 25 for the gas and smoke produced by the detonator 5. This expansion chamber 25 is limited at its circumference by the body 15 of the projectile.

As already mentioned, the centering disk 33 is held by the stem 35 and rests against a stop 40 on the deflector 31, this stop being formed by the cone 34 at the base proximal end of the stem.

The base end of the tube 9 is welded to an 6 intermediate piece 41 which is screwed into the body 15 of the projectile. The tube 9 and the intermediate piece 41 carry a disk-shaped base 17 in such a way that it is displaceable or ejectable. The base 17 is connected with the intermediate piece 41 by way of a screw thread 18 which can shear off.

With target impact of the training projectile 1, the nose fuze 3 initiates the propagation charge 5. The gases produced by the explosion of the propagation charge 5 expand both in the expansion chamber 25 as well as after passing through the holes 32 in the centering disk 33 - in the annular space 23 without the intermediate piece 41 being ejected from the training projectile 1.

The gases of the propagation charge 5 ignite the indicator charge 7, or ignite the ignition charge 21 and this in turn ignites the indicator charge 7.

The burning indicator charge 7 produces such a great gas pressure that the thread 18 is sheared of f and the base 17 is ejected from the intermediate piece 41. then the products of indicator charge 7 possible with some of the burning charge emerge from the rear of the projectile.

The tube 9, the centering disk 33 and the intermediate piece 41 remain within the body 15 of the projectile and only the base 17 is hurled away as unit. In it surprising that, despite the large propagation charge 5, the body 15 7 of the projectile does not rip open and the base 17 lies in the direct vicinity within two metres of the point of impact. The danger zone is therefore drastically reduced.

Thetraining projectile 1 consists of few and simple components. The projectile body 15 of a high-explosive projectile, which is not represented, is only slightly machined after steaming out or removing the originally contained explosive. A threaded bore 41 is made inside the base end and the groove 37 in the fuze proximal or front portion.

Then, in a single screwing-in process, the complete training insert consisting of the intermediate piece 41 with base 17, tube 9 with the indicator charge 7 and deflector 31 and with the mounted centering disk 33 is screwed into the body 15 of the projectile and secured in the traditional way. Then there is only the fuze 3 still to be screwed in at the front. All the components of the training insert are lathe-cut parts or are standardised and are to be joined together in a simple way.

The training projectile is proof against the loads and shocks it experiences upon firing and flight, and is resistant to environmental influences.

Claims

8 CLAIMS

1. Ballistic training projectile for medium- to large calibre barrel or tubular weapons comprising a nose fuze with propagation charge, an indicator charge in a central tube held by its base end, a body with an ejectable base, and, between the propagation charge and the indicator charge, a detonating canal proximal to the central tube, there being an annular space between the projectile body and the tube, characterised in that an expansion chamber is provided between the propagation charge and the detonating canal.

2. A projectile according to Claim 1, characterised in that the tube is completely filled with the indicator charge.

3. A projectile according to Claim 1 or 2, characterised in that the detonating canal is located in a deflector for the gases and smoke produced by the explosion of the fuze and charge, and the deflector is connected with the fuze proximal end of the tube.

4. A projectile according to Claim 1, 2 or 3, characterised in that the tube, or the tube by way of the deflector, is supported at its fuze proximal end against the body of the projectile by at least one gas permeable transverse support.

9

5. A projectile according to Claim 4, characterise din that a perforated centering disk serves as the transverse support and is located on a stem of the deflector and rests in a groove in the body of the projectile against a 5 stop on the side of the groove nearest the fuze.

6. A projectile according to Claim 1, characterised in that the tube is firmly connected at its base end with an intermediate piece inserted in the body of the projectile and the ejectable, disk-shaped base is mounted in the intermediate piece of the tube.

7. A projectile according to Claim 3, characterised in that the deflector is flush with the outer diameter of the tube, and the deflector is formed over the greatest part of its length as a cone.

8. A projectile according to Claim 3 or 4, characterised in that the deflector has a stem at its front (fuze proximal) end on which the transverse support is mounted to abut a stop on the deflection.

9. Ballistic training projectile according to Claim 8, characterised in that the transverse support takes the form of a perforated centering disk.

10. A ballistic training projectile substantially as hereinbefore described with reference to the accompanying drawings.