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The Rolls-Royce R was a British aero engine designed and built specifically for air racing purposes by Rolls-Royce Limited. Developed from the Rolls-Royce Buzzard, it was a 37-litre (2,240 cu in) capacity, supercharged V-12 capable of producing just under 2,800 horsepower (2,090 kW), and weighed 1,640 pounds (770 kg). Factory testing initially revealed mechanical failures that were reduced by the use of redesigned components, greatly improving reliability. The R was highly successful during its use in the Schneider Trophy seaplane competitions held in England in 1929 and 1931. Shortly after the 1931 competition, an R engine using a special fuel blend powered the winning Supermarine S.6B aircraft to a new airspeed record of over 400 miles per hour (640 km/h). Continuing through the 1930s, both new and used R engines were used to achieve various land and water speed records by such racing personalities as Sir Henry Segrave, Sir Malcolm Campbell, and his son Donald; the last record was set in 1939. Nineteen R engines were assembled in a limited production run between 1929 and 1931. The experience gained by Rolls-Royce and Supermarine designers was invaluable in the subsequent development of the Rolls-Royce Merlin engine and the Spitfire.