Abstract: A liquid propellant gun system has an annular differential piston journaled for telescopic movement with respect to an annular control valve and to the chamber of the firing bore; uses the piston, the valve and the projectile as valve means for controlling the injection of liquid propellant into the combustion chamber of the gun system; uses a displacement type control means to limit the rate of the loading of liquid propellant and to provide a positive evacuation of misfired liquid propellant from the combustion chambers; and incorporates a vernier control circuit to give direct control over the performance of the gun.

Abstract: This invention provides a liquid propellant gun embodying a first species of this invention wherein the inner differential area piston is controlled by a variable damping mechanism, and both pistons have respective cross-sectional areas coupled to the pumping chamber.

Abstract: This invention provides a liquid propellant gun embodying a first species of this invention wherein the inner differential area piston is controlled by a variable damping mechanism, and both pistons have respective cross-sectional areas coupled to the pumping chamber.

Abstract: A regenerative liquid propellant gun structure in which the differential area piston is annular, having a peripheral cylindrical skirt extending away from the combustion chamber to define a propellant reservoir, and has an aperture permitting overrunning of a fixed bolt. The fixed bolt is shaped to define with the edge of the aperture a variable annual orifice for propellant injection as the piston moves. There is a second free piston overrunning the bolt and mating with the inside of the differential area piston to complete and provide for emptying of the reservoir. The structure also contains a spring to allow components to move responsive to increased combustion chamber pressure to provide for an initial movement of differential area piston relative to the bolt to start propellant injection and a fluid pressure means for movement of pistons after firings to facilitate reloading.

Abstract: A regenerative liquid propellant gun having structure which reacts to combustion pressure to dispense and regulate the flow of liquid propellant from an included reservoir as one parameter for obtaining a predetermined pressure/time curve of gun chamber pressure. A first coaxial pumping piston is a differential area pressure piston operating between the combustion chamber and the primary propellant reservoir. A second coaxial piston in a bore in the first piston opens and closes injection ducts running through the pumping piston from the primary reservoir to the bore to interdict flow of propellant to the combustion chamber as a result of relative motion of the two pistons as one or both move responsive to propellant combustion pressure.