Pulse-jet engines of the valveless type

Claim 1

A VALVELESS PULSE-JET ENGINE COMPRISING AN ELONGATED LONGITUDINALLY EXTENDING TUBULAR FIRST SECTION DEFINING THEREIN A PRIMARY COMBUSTION CHAMBER, A CAP CONNECTED TO THE FRONT END OF SAID FIRST SECTION AND CLOSING THE ADJACENT FRONT END OF SAID PRIMARY COMBUSTION CHAMBER TO THE ATMOSPHERE, AND ELONGATED LONGITUDINALLY EXTENDING AND REARWARDLY CONVERGING TUBULAR SECOND SECTION DEFINING THEREIN A SECONDARY COMBUSTION CHAMBER, THE REAR END OF SAID FIRST SECTION BEING CONNECTED TO THE FRONT END OF SAID SECOND SECTION WITH THE REAR END OF SAID PRIMARY COMBUSTION CHAMBER OPENING INTO THE ADJACENT FRONT END OF SAID SECONDARY COMBUSTION CHAMBER, AN ELONGATED LOGITUDINALLY EXTENDING TUBULAR THIRD SECTION DEFINING AN EXHAUST PASSAGE THERETHROUGH, THE REAR END OF SAID SECOND SECTION BEING CONNECTED TO THE FRONT END OF SAID THIRD SECTION WITH THE REAR END OF SAID SECONDARY COMBUSTION CHAMBER OPENING INTO THE FRONT END OF SAID EXHAUST PASSAGE, THE REAR END OF SAID THIRD SECTION BEING OPEN, WHEREBY THE REAR END OF SAID EXHAUST PASSAGE CONSTITUTES AN EXHAUST GAS NOZZLE COMMUNICATING WITH THE ATMOSPHERE, THE LONGITUDINAL AXES OF SAID FIRST AND SECOND AND THIRD SECTIONS BEING ARRANGED SUBSTANTIALLY IN ALIGNMENT ALONG A COMMON LONGITUDINAL AXIS, SAID SECOND SECTION HAVING A LENGTH THAT IS ABOUT 1/2 OF THAT OF SAID FIRST SECTION AND THAT IS ABOUT 1/8 THAT OF SAID THIRD SECTION, AN ELONGATED LONGITUDINALLY EXTENDING TUBULAR FOURTH SECTION DEFINING AN INLET PASSAGE THERETHROUGH, THE LONGITUDINAL AXIS OF SAID FOURTH SECTION BEING IN LATERAL OFF-SET RELATION WITH RESPECT TO SAID COMMON AXIS, THE FRONT END OF SAID FOURTH SECTION BEING CONNECTED TO THE FRONT PORTION OF SAID SECOND SECTION WITH THE ADJACENT FRONT END OF SAID INLET PASSAGE OPENING INTO THE FRONT PORTION OF SAID SECONDARY COMBUSTION CHAMBER, THE REAR END OF SAID FOURTH SECTION BEING OPEN, WHEREBY THE ADJACENT REAR END OF SAID INLET PASSAGE CONSTITUTES A REAR INLET NOZZLE COMMUNICATING WITH THE ATMOSPHERE, AN ELONGATED LONGITUDINALLY EXTENDING TUBULAR FIFTH SECTION DEFINING A SCOOP PASSAGE THERETHROUGH, THE LONGITUDINAL AXIS OF SAID FIFTH SECTION BEING DISPOSED IN LATERAL OFF-SET RELATION WITH RESPECT TO THE LONGITUDINAL AXIS OF SLAID FOURTH SECTION, THE FRONT END OF SAID FIFTH SECTION BEING OPEN, WHEREBY THE ADJACENT FRONT END OF SAID SCOOP PASSAGE CONSTITUTES A MOUTH COMMUNICATING WITH THE ATMOSPHERE, THE REAR PORTION OF SAID FIFTH SECTION HAVING A RETURN BEND THEREIN DISPOSED ADJACENT TO THE REAR END OF SAID FOURTH SECTION, THE REAR END OF SAID FIFTH SECTION BEING FORWARDLY DIRECTED AND DISPOSED IN SAID AIR INLET NOZZLE, THE REAR END OF SAID FITH SECTION BEING OPEN, WHEREBY THE ADJACENT REAR END OF SAID SCOOP PASSAGE CONSTITUTES AN AIR OUTLET NOZZLE COMMUNICATING WITH SAID AIR INLET NOZZLE, MEANS FOR INJECTING FUEL IN FINELY DIVIDED FORM FORWARDLY THROUGH THE FRONT END OF SAID SECONDARY COMBUSTION CHAMBER AND INTO THE REAR END OF SAID PRIMARY COMBUSTION CHAMBER AND DIRECTED TOWARD THE FRONT END THEREOF, AND MEANS FOR IGNITING THE COMBUSTIBLE MIXTURE OF FUEL AND AIR IN SAID PRIMARY COMBUSTION CHAMBER.