Ammunition and explosives – Projectiles – Having jacket
Patent
1986-06-23
1987-11-24
Tudor, Harold J.
Ammunition and explosives
Projectiles
Having jacket
102518, F42B 1114
Patent
active
047080639
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to projectiles intended to be fired by a fire-arm, comprising a central core, a rear body whose diameter determines the caliber of the projectile and interlocking means between said central core and said rear body.
BACKGROUND OF THE INVENTION
A problem which arises in projectiles of this type resides in the construction of these interlocking means which must be such that, from the mechanical point of view, the projectile may behave, when it is fired more especially by a weapon with rifled barrel, as a monobloc projectile.
Another problem which arises in projectiles of this type resides in the arrangement of its rear body which must be connected to the case and which must cooperate, once firing has been initiated, with the barrel of the weapon.
SUMMARY OF THE INVENTION
To resolve these problems, the interlocking means comprise, on the one hand, a conical sleeve coupling formed by a conical housing and a conical finger of complementary shapes and, on the other hand, an axial abutment surface; and the rear body comprises at least one swelling cooperating with the barrel of the weapon and at least one hollow, this swelling and this hollow being joined up to each other progressively so as to define a profiled shape.
With the self-clamping effect of the conical sleeve coupling and the retaining effect of the axial abutment surface, the projectile behaves then, during firing, like a monobloc projectile. This is particularly noticeable if the projectile is fired from a weapon with rifled barrel for, at the moment when it is set in rotation when the rear body engages in the rifling, the angular acceleration is transmitted without any loss by sliding between the rear body and the central core.
It is thus possible to form this projectile in two parts, which allows a choice to made of the material forming the central core (hard, semi-hard or soft material), and a choice of the material forming the rear body (material adapted for cooperation with the barrel of the weapon under the best possible conditions), while keeping the advantages of a monobloc projectile from the ballistics point of view.
In particular, a projectile may be formed which presents a high penetration force because of its ballistics characteristics, and high expansion effects because of the possibilities of shape and choice of material offered by its two-part construction.
Furthermore, because of the external construction of the rear body of the projectile, and the shape of the swelling which it comprises, on the one hand an increase in the pressure after combustion of the powder charge may be obtained. This occurs because of better efficiency of crimping the case to the projectile, resulting in better sealing between the projectile and the internal wall of the chamber of the weapon. In addition a progressive rifling may be obtained, when the projectile reaches the rifled wall of the weapon, for this rifling takes place with a small axial deceleration.
In so far as crimping the case to the projectile is concerned, it may be made on the rear body either at the level of the swelling, or at the level of the hollow, which in both cases improves efficiency thereof.
The aerodynamic characteristics of the projectile are improved with respect to a conventional projectile because of the fact that marking of the rear body by the barrel only affects the swelling of this rear body and generates a parasite drag considerably smaller than that noted in a conventional projectile.
It can then be readily seen that the projectile of the invention presents characteristics of accuracy and power, more especially in so far as its initial speed and its impact speed are concerned. These characteristics of accuracy and power are substantially greater than those of a conventional projectile. Moreover, the life-span of the barrel of the weapon firing projectiles in accordance with the invention is improved. In particular when it is a question of a weapon with rifled barrel, this improvement occurs because of the progressiveness
REFERENCES:
patent: 388496 (1888-08-01), Langfitt
patent: 1021685 (1912-03-01), Knaebel
patent: 1322662 (1919-11-01), Watson
patent: 1556160 (1925-10-01), Riggs
patent: 2123981 (1938-07-01), Whipple
The PPI Phenomenon by SFM (no date).
S.F.M., L'effet PPI, Defense & Armement, 12/84, p. 31.
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