 The program failure was primarily due to lack of investment in research and experimental resources by Westinghouse, leaving them unable to resolve the issues with the various models of the engines.In 1953 Westinghouse worked with Rolls-Royce to offer engines based on the Avon, which had similar performance but matured into an excellent design of even higher output.Westinghouse was out of the aircraft engine business by 1965 when their thrust, scaled-down version of the Avon 300-series engine, the XJ54, also failed to find a United States market.