The Eagle was never fitted to a production front-line fighter, as it was overshadowed by a new wave of turbojet engines, such as the Rolls-Royce Derwent and turboprops such as the Dart and Armstrong Siddeley Python. Fifteen Eagle 22s were produced to power prototypes of the Westland Wyvern fighter/torpedo bomber due to its intended powerplant, the AS Python being late in development.[1]