Patent ID: 6089139
Filing Date: 2000-07-18
Classification: F41A,F41B

Abstract:
A nozzle projectile barrel comprising a barrel wall extending from a breech end to a muzzle end and defining a main projectile passageway of constant cross section for the passage of a projectile driven by a driving gas therethrough,said barrel wall having a plurality of longitudinally spaced apart transverse passageways therethrough positioned in a region of the barrel between a point where the driving gas immediately behind the projectile achieves local Mach 1 and the muzzle end of the barrel wall so that a local gas mass flow from the main projectile passageway through the longitudinally spaced apart transverse passageways causes supersonic driving gas flow relative to the speed of sound in said driving gas within said nozzle projectile barrel,wherein at least one of said transverse passageways has at least one control mechanism allowing adjustment of the gas mass flow out of the main projectile passageway.