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The Clerget was an early aircraft engine. Manufactured in both Great Britain and France, it was used on such aircraft as the Sopwith Camel.
The Clerget is an air-cooled rotary engine with nine cylinders, 120 mm by 160 mm, rated at 110 hp (82 kW), but capable of developing 130 hp (97 kW) at 1,200 rpm. It is fitted with a double thrust ball race, which enables it to be used either as a pusher or as a tractor.
The engine works on a four-stroke cycle. Its chief points of difference from other rotary engines are:
Approx weight of engine: 365 lb (166 kg), i.e. 3.3 lb per rated hp (2 kg/kW) (0.36hp/lb)