CARTRIDGE Russian patent published in 1998 - IPC

FIELD: ammunition; small used under water and on surface. SUBSTANCE: cartridge is made in form of thin-walled cylindrical case with serration and blades in tail section for rotation in flight. As a result, arms are short, without grooves and small-sized. There is no aerodynamic drag for bullet over entire trajectory. On firing under water or on surface, as well as on firing from under water, bullet reliably hits target. Cartridge reliably holds trajectory and possesses high accuracy of hits. Case is provided with two concentric walls with sealant between them; bullet is located over entire depth of case. Front portion of inner wall of case is provided with blind base; rear portion of case is provided with sabot with cartridge case vent; powder charge is placed between bases; gas ports for passage of gases to bullet in firing are also provided. EFFECT: enhanced reliability. 2 cl, 2 dwg