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The Bentley AR1/BR1 Rotary engine was a British 9 cylinder rotary aircraft engine of WW1. The crankshaft remained stationary, the entire crankcase and the attached cylinders rotated around it as one unit. Its main application was in World War 1 aviation. The BR.1 was built in large numbers, being one of the main powerplants of the Sopwith Camel.
