Abstract: A liquid propellant gun utilizes a plurality of combustor assemblies or cells located about the periphery of the breech end of a gun barrel. Scaling to larger size guns may be achieved by using different numbers of identical combustor assemblies about the periphery of the bore. Further adjustments may be made by changing the stroke length. Such a standardized piston may be developed for a single cell gun where it may be perfected prior to adding pluralities of said cells to form larger guns. Due to each cell burning propellant progressively, each generates gas at a fixed rate so that for example eight cells supply eight times the rate of one cell. Hence scaling becomes a rational procedure.

Abstract: A liquid propellant gun utilizes a differential piston having a plurality of bores through its head, which head divides the liquid propellant pumping chamber from the combustion chamber, and propellant supply means providing liquid propellant under pressure into said pumping chamber, which propellant under pressure both advances the piston to enlarge the pumping chamber and to decrease the combustion chamber and injects and atomizes a predetermined quantity of propellant through said bores from said pumping chamber into said combustion chamber.

Abstract: A liquid propellant gun has a combustion chamber which receives liquid propellant from a differential piston operating in a supply chamber, has a gun barrel for the discharge of a projectile, and a balancing nozzle for the discharge of combustion gas. The effective open cross-sectional area of the balancing nozzle is controlled by a plug coupled to the differential piston so that at the start of combustion the nozzle is substantially closed, is subsequently progressively opened in a controlled manner independent of the displacement of the projectile, and is finally fully opened or closed.

Abstract: A liquid propellant gun utilizes a differential piston having a plurality of bores through its head, which head divides the liquid propellant pumping chamber from the combustion chamber, and propellant supply means providing liquid propellant under pressure into said pumping chamber, which propellant under pressure both advances the piston to enlarge the pumping chamber and to decrease the combustion chamber and injects and atomizes a predetermined quantity of propellant through said bores from said pumping chamber into said combustion chamber, and a check valve which precludes flow of liquid propellant under pressure from said piston to said propellant supply means and damps said piston at the end of its combustion stroke.