NOISELESS CARTRIDGE Russian patent published in 2002 - IPC

FIELD: ammunition, in particular, cartridges of fighting and sporting automatic, semiautomatic and non-automatic small arms. SUBSTANCE: cartridge has a shot, cartridge case, piston with a diameter exceeding the caliber, installed for a working stroke up to its retardation in the cartridge case pitch, powder propelling charge with a device for its ignition and liquid filling the space between the shot and the piston. Glycerin-water solution or solution contains, %: glycerin, 46; alcohol, 19; water, 35 used as liquid. An eutectic mixture of glycerin and water, approximately 70 and 30% is recommended. In one of the modifications of construction the cartridge case is made tapered on the outer and inner sides, and its bottom part is detachable and envelops the piston-separator at least over the entire length of its working stroke, the inner surface of the bottom part conjugate to the surface of the piston-separator is made cylindrical, and the outer surface conjugate to the inner surface of the cartridge case is made tapered at least on the upper part of its height. At a fighting use of the cartridge the piston-separator expels the shot to the rifled bore by means of liquid. The active stroke of the shot exceeds the working stroke of the piston- separator. The liquid action of the shot continues in the remaining length of the barrel and partially beyond its limits. The liquid facilitates obturation of gases and absorption of sound. EFFECT: expanded abilities and improved characteristics of the noiseless cartridge. 4 cl, 3 dwg