Patent ID: 7305911
Filing Date: 2007-12-11
Classification: F41A,F41F

Abstract:
1. A powder-gas-driven free-flying projectile, comprising: an active load arranged in a front of the projectile; a propellant powder charge arranged behind the active load, wherein gases formed by combustion of the propellant powder charge accelerate the projectile to a flying speed in a flying direction; an igniter operative to initiate combustion of the propellant powder charge; a piston arranged behind and adjacent the propellant powder charge, such that gases formed upon initiation of combustion of the propellant powder act directly on the piston to displace the piston in a direction opposite to the flying direction simultaneously with accelerating the projectile in the flying direction; a countermass arranged behind the piston such that movement of the piston displaces the countermass in the direction opposite to the flying direction and out of the projectile; and a projecting edge operative to permit the countermass to pass out of the projectile and to receive the piston therein, and to engage, brake and compress the piston as it is displaced in the direction opposite to the flying direction and passes the projecting edge, thereby sealing the projectile and retaining the gases formed by combustion of the propellant charge within the projectile.