Tubular projectile

Details Tubular projectile Tubular projectile

F - Mech Eng,Light,Heat,Weapons

42

B

102/5

F42B 10/34 (2006.01)

Patent

CA 1064321

ABSTRACT OF THE DISCLOSURE A projectile adapted to be fired at supersonic velocity from a gun barrel includes a tubular body of sub- stantially circular cross-section having a leading inlet end and a trailing exit end and a central passageway extending therethrough. The leading end of the body is of a shape such that the internal diameter of the central passageway decreases from the leading inlet end to a throat region. The ratio of the cross-sectional area of the passageway in the throat region (At) to the cross-sectional area of the passageway at the leading inlet end (Ai) is sufficiently large and is so related to the projectile velocity at launch as to enable a normal shock wave to pass through the throat region to establish supersonic flow in the passageway and thus provide a relatively low aerodynamic drag after launching. The ratio At/Ai also has a value less than 1.0 so that as the velocity of the projectile decreases to a predetermined flight Mach number, which is a function of the At/Ai ratio, the shock wave is expelled from the passageway to establish choked flow conditions in said passageway and relatively high aerodynamic drag whereby to limit the range of the projectile. . . . . . . .

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