Supersonic jet propulsion nozzle

Claim 1

A SUPERSONIC JET PROPULSION NOZZLE COMPRISING: A SUBSTANTIALLY CYLINDRICAL NOZZLE CASING HAVING A DOWNSTREAM END; A BULBOUS PLUG MOUNTED IN SAID CASING AND DEFINING WITH SAID CASING A THROAT; SAID PLUG AND SAID CASING BEING MOVABLE AXIALLY RELATIVE TO EACH OTHER AS DESIRED BETWEEN AT LEAST TWO POSITIONS, ONE POSITION IN WHICH SAID THROAT IS AT THE DOWNSTREAM END OF SAID CASING AND DEFINES A CONVERGENT NOZZLE AND THE OTHER POSITION IN WHICH SAID THROAT IS UPSTREAM OF SAID DOWNSTREAM END OF SAID CASING AND DEFINES A CONVERGENT-DIVERGENT NOZZLE; TRANVERSELY MOVABLE PORTIONS ON SAID PLUG FOR VARYING THE AREA OF SAID THROAT IN EACH OF SAID ONE AND SAID OTHER POSITIONS OF SAID PLUG RELATIVE TO SAID CASING; AND SILENCING MEANS, INDEPENDENT OF AND ANGULARLY SPACED RELATIVE TO SAID MOVABLE PORTIONS, FOR SUBSTANTIALLY INCREASING PERIPHERAL AREA OVER WHICH JET GASES MIX WITH AMBIENT AIR TO SUBSTANTIALLY REDUCE THE NOISE CREATED BY JET GASES PASSING THROUGH SAID NOZZLE.