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In page V12 engine:

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Renault introduced the first V12 engine for aircraft with their 90 hp model of 1912. This engine had a V-angle of 60 degrees, air cooling and an intake over exhaust (F-head) valve arrangement. The propeller was driven from the front end of the camshaft, thus spinning the propeller speed at half the speed of a typical crankshaft driven propeller, in order to improve the propeller efficiency.[1] The Renault engine was closely mimicked by the RAF 4 and its derivatives,[citation needed] which was used by various British military aircraft during World War I. The RAF 4 engine had a displacement of 13.2 L (806 cu in), weighed 289 kg (637 lb) and produced 104 kW (140 hp) at 1,800 rpm.