Propellant grain for rocket motors

Claim 1

A SOLID PROPELLANT ROCKET MOTOR COMPRISING A CYLINDRICAL CASING HAVING A ROUNDED END CLOSURE AT ONE END AND AN OPENING AT THE OTHER END, A TUBULAR BODY OF SOLID PROPELLANT GRAIN HAVING A CYLINDRICAL BORE AND POSITIONED WITHIN SAID CASING CONCENTRICALLY WITH AND SPACED THEREFROM AND DEFINING AN ANNULAR SPACE, A GRAIN OF SOLID PROPELLANT BONDED TO THE ENTIRE INNER SURFACE OF THE CASING, MEANS CLOSING THE ANNULAR SPACE BETWEEN THE OPEN END OF THE CASING AND SAID TUBULAR BODY, AN OUTWARDLY FLARED NOZZLE ATTACHED TO THE OPEN END OF THE CASING AND EXTENDING INTO THE CYLINDRICAL BORE, WHEREBY AFTER IGNITION THE COMBUSTION PRODUCTS OF SAID GRAIN PASS FORWARD THROUGH THE ANNULAR SPACE TOWARD THE CLOSED END OF THE CASING AND THEN OUT THROUGH THE CYLINDRICAL BORE, COMBINING WITH THE COMBUSTION PRODUCTS OF THE TUBULAR BODY AND CONTINUING OUT THROUGH SAID NOZZLE.