Combined turbojet-ramjet units

Claim 1

A COMBINED TURBOJET-RAMJET COMPRISING, IN COMBINATION (A) A RAMJET HAVING A DIRECT AIR STREAM INTAKE DUCT PROVIDED WITH AN AIR INTAKE OPENING, (B) A TURBOFAN HAVING A LOW PRESSURE ROTOR INCLUDING A LOW PRESSURE COMPRESSOR AND A HIGH PRESSURE ROTOR INCLUDING A HIGH PRESSURE COMPRESSOR, SAID TURBOFAN BEING MOUNTED CONCENTRICALLY IN SAID RAMJET AND HAVING (C) AN AIR INTAKE OPENING DOWNSTREAM OF THE AIR INTAKE OPENING OF SAID RAMJET, (D) AN OUTLET NOZZLE FOR SAID RAMJET, (E) AN OUTLET NOZZLE FOR SAID TURBOFAN. (F) THE END OF THE OUTLET NOZZLE OF SAID TURBOFAN BEING OF CONSTANT CROSS-SECTION AND BEING LOCATED A DISTANCE UPSTREAM OF THE END OF THE OUTLET NOZZLE OF THE RAMJET, SO THAT THE OUTLET NOZZLE OF HE RAMJET BECOMES THE OUTLET NOZZLE OF THE COMBINED JET ENGINE, (G) A MAIN CASING FOR THE TURBOFAN HAVING (H) A PASSAGEWAY COMMUNICATING THE OUTLET OF THE LOW PRESSURE COMPRESSOR WITH SAID INTAKE DUCT SO THAT THE WHOLE OF THE SECONDARY AIR STREAM OF SAID TURBOFAN CAN FLOW INTO THE INTAKE DUCT FOR THE DIRECT AIR STREAM OF SAID RAMJET, (I) SAID PASSAGEWAY BEING LOCATED BETWEEN THE LOW PRESSURE COMPRESSOR AND THE HIGH PRESSURE COMPRESSOR, (J) FIRST MEANS FOR REGULATING THE CROSS-SECTIONAL AREA OF THE OUTLET SECTION OF SAID PASSAGEWAY TO SAID INTAKE DUCT FOR SAID DIRECT AIR STREAM TO SAID RAMJET, SAID MEANS HAVING ONE LIMITING POSITION IN WHICH IT COMPLETELY OPENS SAID OUTLET SECTION OF THE PASSAGEWAY TO SAID INTAKE DUCT AND COMPLETELY SHUTS OFF SAID RAMJET AIR INTAKE OPENING FROM SAID INTAKE DUCT AND A SECOND POSITION IN WHICH IT CAN COMPLETELY OBSTRUCT THE OUTLET SECTION OF SAID PASSAGEWAY TO PREVENT AIR FROM THE LOW PRESSURE COMPRESSOR FLOWING INTO SAID INTAKE DUCT, AND (K) SECOND MEANS FOR REGULATING THE OUTLET SECTION OF SAID OUTLET NOZZLE OF SAID RAMJET.