Liquid propellant weapon systems

A weapon system comprising:

• a gun having a firing bore;
• a round of ammunition disposed in said firing bore including:
• a longitudinally extending cartridge case having a forward end, and an aft end having a transverse base plate with a central bore;
• a relatively high mass projectile means held in and closing said forward end of said cartridge case;
• a relatively low mass piston longitudinally slidable within and sealed to the interior wall of said cartridge case and disposed aft of said projectile means and forward of said base plate;
• said piston having a first face of relatively large cross-sectional area and a second face of relatively small cross-sectional area, a central bore longitudinally extending between said first and second faces, an additional passageway communicating said second face with said first face, and a pressure sensitive obturating means obturating said additional passageway and adapted to open said additional passageway upon a predetermined pressure being provided on said first face;
• a converging/diverging nozzle fixed and sealed to said piston about said bore of said piston and journaled through and sealed to said bore of base plate;
• and
• a burstable diaphragm fixed and sealed to said piston, obturating said bore of said piston;
• said cartridge case, said projectile means and said first face of said piston and said diaphragm defining a combustion chamber;
• said cartridge case, said base plate, said second face of said piston and said nozzle defining a liquid propellant storage chamber.