The Rolls-Royce Spey powered the British Aerospace Nimrod maritime patrol aircraft.
The Nimrod was developed from the de Havilland Comet airliner and entered Royal Air Force service in 1969. Its early production versions used four Rolls-Royce Spey turbofan engines. The Spey offered improved efficiency and lower noise compared with earlier turbojet technology, making it suitable for the long patrol missions required of the Nimrod.
The engine family was widely used in military and civil aircraft. Different versions powered aircraft such as the Blackburn Buccaneer and the F-4K and F-4M Phantom II, while the Nimrod installation was adapted to the needs of maritime reconnaissance.
The Nimrod should not be confused with the later Nimrod MRA4 upgrade, which involved extensively rebuilt aircraft and different Rolls-Royce engine arrangements. The original Nimrod’s defining engine answer is Spey.