Ammunition and explosives – Cartridges – Practice projectile type
Patent
1999-03-11
2000-11-14
Tudor, Harold J.
Ammunition and explosives
Cartridges
Practice projectile type
42 77, 89 29, F42B 810
Patent
active
061454400
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a training weapon system for a portable recoilless anti-armour weapon of the type which comprises a sub-caliber insert barrel arranged in the bore of the launching barrel of the anti-armour weapon. One example of a recoilless anti-armour weapon in which the invention can be used is the 84 mm Carl Gustaf recoilless gun m/48.
For an effective training of a specific weapon it is important that the soldiers are permitted to fire a large number of ammunition rounds under as realistic conditions as possible. This means that the handling of the weapon and its ammunition should be as close to the real (parent) weapon as possible and the firing experience should also be as realistic as possible. Of course, this is best achieved by allowing full-caliber ammunition rounds also for the training. However, this can rarely be done for economical and safety reasons.
Therefore, it is previously known to use sub-caliber ammunition training weapons. In this case the training weapon has a sub-caliber insert barrel arranged inside the barrel of the parent weapon in question. Specifically, for an 84 mm anti-armour gun m/48 sub-caliber systems of 7.62 mm, 9 mm and 20 mm caliber have been developed. One example of a 20 mm caliber training weapon of this type is illustrated in SE 9400043-7.
The advantage with this type of training weapon systems is the fact that the soldier is allowed to fire a sub-caliber instead of an expensive full caliber ammunition round. He can well study his ability to hit the target. However, in the 7.62 mm as well as in the 9 mm system, the firing experience is quite different from the real, live conditions. The soldier does not experience the sudden sound and gas pressure which is generated in the corresponding service weapon system. In order to simulate the specific out-blow effect at the rear of the weapon an additional charge has to be applied in these systems. This charge is detonated at the firing moment in order to give the soldier a more realistic training experience with respect to the generated sound and shock waves.
The 20 mm training system, however, provides a realistic sound level around the weapon and this system also provides an out-blow effect because of its recoilless function. The sub-caliber barrel is disposed in the bore of the full-caliber weapon in a body shaped as a round of ammunition similar to the full-caliber high explosive shell. The sub-calibre barrel is smooth-bored. However, the accuracy of such a system is unsatisfactory as soon as the firing distance exceeds 250 m.
Furthermore, in some cases it has happened that the so-called nozzle screw has been unscrewed at the firing and thrown rearwards with a high safety risk for personnel behind the weapon.
Recoilless ammunition round of this type also have a plastic bottom plate member which is broken when the round is fired. When the bottom plate member is broken it is divided into small splinters which could be dangerous up to 70 m behind the weapon. This can be compared with a required safety distance of 15 m for the service weapon under war conditions.
The object of this invention is to provide a sub-caliber weapon system for training purposes in which the accuracy and safety has been improved but at reduced cost compared to previous systems of this kind. According to the invention this is achieved by providing the sub-calibre insert barrel with a rifled bore and arranging the insert barrel so that the forward aligning member of the barrel is engaging the ridges of the rifling in the rifled section of the full-caliber weapon.
In the following the invention will be described more in detail in connection with a 20 mm training weapon system for an 84 mm gun m/48 and which is schematically illustrated on the accompanyed drawing.
The reason for choosing caliber 20 mm system is the fact that such a system provides a realistic sound level around the weapon, as already mentioned. It also seems as if a caliber around 20 mm has an optimal cost efficiency relative to the required training and feeling expe
REFERENCES:
patent: 1538561 (1925-05-01), Koller
patent: 2541025 (1951-02-01), Bluford et al.
patent: 2857812 (1958-10-01), Nichols
Simbal AB
Tudor Harold J.
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