Rolls-Royce R engine was invaluable in the subsequent development of the Rolls-Royce Merlin engine and the Spitfire. A de-rated R engine, known as the Griffon, was tested in 1933, but it was not directly related to the production Rolls-Royce Griffon of 1939, of the same exact bore/stroke and resultant displacement figures as the "R" design. Three examples of the R engine are on public display in British museums as of 2014. Rolls-Royce realised that the Napier Lion engine used in the 1927 Supermarine S.5 Schneider Trophy winner had reached the peak of its development, and that for Britain's entrant in the next
Rolls-Royce Motors of the RB211 jet engine. In 1973, the British government sold the Rolls-Royce car business to allow nationalised parent Rolls-Royce (1971) Limited to concentrate on jet engine manufacture. In 1980, Rolls-Royce Motors was acquired by Vickers. In 1998, Vickers plc decided to sell Rolls-Royce Motors. The leading contender seemed to be BMW, who already supplied internal combustion engines and other components for Rolls-Royce and Bentley cars. Their final offer of £340m was outbid by Volkswagen Group, who offered £430m. As part of the deal, Volkswagen Group acquired the historic Crewe factory, plus the rights to the "Spirit of Ecstasy" mascot