Bristol Siddeley

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Bristol Siddeley was a British aero-engine manufacturer formed in 1959 from the merger of Bristol Aero Engines and Armstrong Siddeley Motors. Its Filton factory in North Bristol produced many high performance military aeroplane engines including the Olympus two spool turbojet (from which the engine for Concorde was developed), the Orpheus turbojet for the Folland Gnat light fighter/trainer aircraft, the Pegasus vectored thrust turbofan for the Hawker P.1127/Kestrel STOVL fighter, the Proteus turboprop for the Bristol Britannia airliner and the Viper turbojet for the BAe 125. Bristol Siddeley had under development another vectored thrust turbofan, the afterburner equipped BS100, which was intended for the supersonic P1154 VSTOL fighter, but the project was cancelled in 1965.

In 1961 Bristol Siddeley acquired de Havilland Engines and Blackburn Engines. The aircraft side of Blackburn became part of Hawker Siddeley. Bristol Siddeley was taken over by Rolls-Royce Limited in 1966 (now Rolls-Royce plc).