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A ram jet has a casing 1 formed as a body of revolution containing two annular burners 2. The casing, the diametral section of which is a supersonic aerofoil, may constitute the main supporting aerodynamic surface of an aircraft, and in the embodiment shown the area of the propelling nozzle 3 is controlled by spoilers 4 actuated by a servomotor 14 through a link 15. A second control system may be provided to act independently on the spoilers 4 to produce a jet is controlled by controlling air passages through the casing 1. If desired, the propelling nozzle may be provided with pivoting shutters or air may be introduced under pressure into the jet, which air may be supplied by a special compressor, by another engine on the aircraft such as a turbo‐jet, or turbo‐propeller engine, or by the air flow through the ram jet.