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Note: This is a sub-section of Rolls-Royce
The Rolls-Royce 'R' was a racing aero engine. Developed from the Buzzard it was a 36.7-litre V12. It was capable of producing over 2,500 hp and weighed 774 kg. It was used for Schneider Trophy seaplane racing and for land and water speed record attempts.
Serial numbers were odd, Rolls-Royce practice being to have odd numbers for anticlockwise rotating engines when viewed from the front. The R engine with the serial number R27 broke the world air speed record in a Supermarine: S.6B seaplane travelling at 407.5 mph, was subsequently fitted in George Eyston's Thunderbolt land speed record car, and is now in the London Science Museum.
The design was later used as the basis for the Rolls-Royce Griffon.