Tubular projectile having an explosive material therein

Claim 1

In an improved elongated tubular projectile having a longitudinal center axis consisting of: a cylindrical center throat tubular portion having a wall defined by concentric inner and outer spaced-apart surfaces, a forward tubular compression section adjoining said throat portion and having walls formed by two converging conical surfaces which intersect each other to form a sharp leading edge and enclosing a V-shaped leading edge angle, the bisector of which in the longitudinal cross-section is substantially parallel to said longitudinal center axis, an aft diffusion section adjoining said throat portion and formed by two converging conical surfaces forming a V-shaped trailing edge, said aft section having a smooth constant expansion angle and a smooth transition from said adjoining throat portion to said trailing edge, said throat portion having constant diameter throughout the length of said inner surface, said sharp leading edge defining a circular inlet having a predetermined first cross-sectional area for inlet airflow, said throat portion diameter defining a constant second cross-sectional area for airflow through said throat portion, the ratio of said second area to said first area being not less than 0.6, the improvement consisting of: an annular chamber in said center throat portion between said concentrix inner and outer spaced-apart surfaces defining said tubular wall, said annular chamber having inner and outer walls in said center portion extending into inner and outer frustroconical walls in said forward section, said inner frustroconical wall and a portion of said inner wall of said center portion consisting of a liner, said chamber provided with explosives having detonating means in said aft section communicating with sensor means in said forward section, said explosive completely filling said chamber and surrounding said liner, said sensor means generating an impulse to said detonating means upon detection of a target producing an explosive wave upon detonation of said explosive, said wave propagating to said forward section causing said liner to collapse into a propelled self-forging armor piercing fragment.