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In jet propulsion apparatus, a turbine, means providing motive fluid for the turbine and including a combustor furnished with fuel and supplied with air by a compressor driven by the turbine, a nozzle acting on the exhaust of the turbine to provide a propulsion jet, said nozzle including a component which is movable to vary the nozzle exit area to vary the jet thrust, a speed governor operated by the turbine for controlling the supply of fuel to the combustor and including speed‐setting means, and mechanism for adjusting the speed‐setting means of the governor and the movable component of the nozzle and including a member movable to adjust the governor speed‐setting means to increase the fuel input to increase the turbine speed to maximum and then, while maintaining the turbine speed at maximum, movable to operate the movable component of the nozzle to reduce the nozzle exit area to increase the jet thrust.