The Bentley BR1 was a 9-cylinder rotary engine producing approximately 150–160 hp (112–119 kW). Developed by W.O. Bentley in 1916, it was widely used in British fighters and provided reliable power for many front-line aircraft.

Aircraft powered by the Bentley BR1

• Sopwith Camel – early and mid-production Camels often used the BR1 before switching to 9BF or BR2 in later models.
• Sopwith Snipe – prototypes and early production machines.
• Other experimental aircraft – occasionally fitted in training or prototype planes requiring a 150–160 hp rotary engine.

Historical significance

The BR1 provided a reliable power boost over earlier rotary engines, helping Allied fighters maintain competitiveness in 1917 and early 1918. It bridged the gap between the 9B series and the more powerful BR2.

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