This is an improved version of the French-licensed Clerget engine. It has aluminium cylinders (except for steel heads) and pistons, significantly reducing engine weight. This technological solution reduced the rotary torque of the propeller-engine assembly.
The Bentley BR.1 is displayed in the Museum on the Sopwith F.1 Camel fighter.
| Configuration | 9-cylinder radial |
| Cooling | air |
| Compression ratio | 5.9 |
