Abstract: A supercharger for an internal combustion engine has a turbine driven compressor. The turbine is driven by the exhaust gases and is mounted in a volute casing. The volute casing has an internal flow passage which has an inlet and the passage is arranged to receive and discharge a flow of motive gases. The passage is partly defined by one or more movable wall members. The or each wall member is movable to vary the passage area whilst allowing the whole of the flow of motive gas to flow through the passage. Two movable wall members can be provided operated by a common linkage and the volute casing can have two inlets to receive the exhaust gases from separate manifolds of an internal combustion engine.

Abstract: A V.S.T.O.L. gas turbine power plant includes a main gas turbine engine having an exhaust gas propulsion nozzle and a fan arranged within a fan duct, which duct terminates in two nozzles such that a portion of the fan air may be directed vertically downwards or horizontally, the remaining portion of the fan air acts as a working fluid in one or more further auxiliary gas turbine engines each engine including a vectorable exhaust nozzle.

Abstract: A gas turbine engine has three turbines, the intermediate and high pressure turbines running at substantially constant corrected speed. The low pressure turbine has variable nozzle guide vanes and the low pressure compressor has variable stators so as to enable its speed to be varied, while its mass flow is arranged to be large at low speeds.