The Bristol Siddeley BS.100 was a British twin-spool, vectored thrust, turbofan aero engine that first ran in 1960, the engine was designed and built in limited numbers by Bristol Siddeley Engines Limited.
The Bristol Siddeley BS.100 was a British twin-spool turbofan aero engine. This was what the engine was designed and built in limited numbers by Bristol Siddeley Engines Limited. This spool turbofan aero engine first ran in 1960. Spool was vectored thrust.