Means for launching projectiles

Claim 1

THE COMBINATION WITH A RECOILLESS GUN HAVING A TUBULAR BARREL, A COMBUSTION CHAMBER ATTACHED TO THE BARREL, AND A BALANCING NOZZLE ATTACHED TO THE COMBUSTION CHAMBER, SAID NOZZLE HAVING A RESTRICTION DEFINING A THROAT SMALLER IN CROSS-SECTION THAN SAID COMBUSTION CHAMBER, OF A PROJECTILE CONFIGURATION FOR USE WITH SAID GUN, SAID CONFIGURATION COMPRISING A MAIN BODY PORTION, SAID PORTION HAVING AN AXIAL BOOM ATTACHED THERETO, SAID CONFIGURATION BEING INSERTED IN THE GUN WITH THE BODY PORTION SUPPORTED BY THE BARREL WHEN THE BOOM IS IN THE COMBUSTION CHAMBER, A PROPELLING CHARGE SURROUNDING SAID BOOM, IGNITION OF SAID PROPELLING CHARGE CAUSING THE SAME TO PRODUCE PROPELLENT GASES IN THE COMBUSTION CHAMBER WHICH PROPEL THE BODY AND BOOM ALONG THE BARREL IN ONE DIRECTION, A PORTION OF SAID GASES EXPANDING THROUGH THE THROAT OF SAID NOZZLE IN THE OPPOSITE DIRECTION WHEREBY THE FORCES ACTING ON THE GUN IN BOTH DIRECTIONS ARE SUBSTANTIALLY EQUAL AND THERE IS NO RECOIL, AND A RIGID PLUG ON THE FREE END OF SAID BOOM, SAID PLUG SUBSTANTIALLY BLOCKING SAID THROAT BEFORE IGNITION OF SAID CHARGE AND BEING NONFRANGIBLE AGAINST THE EFFECTS OF PROPELLENT GASES PRODUCED AFTER IGNITION SO THAT SAID BODY, BOOM AND PLUG ARE MOVABLE ALONG SAID BARREL AS A UNIT IN SAID ONE DIRECTION IN RESPONSE TO SAID GASES, SAID PLUG SERVING TO PREVENT SUBSTANTIAL GAS FLOW THROUGH SAID THROAT ONLY UNTIL AFTER PREDETERMINED MOVEMENT OF SAID UNIT IN SAID ON DIRECTION.