Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 140,143 pages of information and 227,382 images on early companies, their products and the people who designed and built them.
WWI The Admiralty asked Lieutenant W. O. Bentley, an established pre-war motor car engine designer, to produce a modified version of the 130 hp Clerget 9B aero-engine to solve its overheating problems.
The Bentley BR.1 was a British rotary aircraft engine designed by W. O. Bentley. The BR.1 was built in large numbers by Humber, being one of the main power-plants of the Sopwith Camel. . . . More Information
The Bentley BR.2 was a British rotary aircraft engine developed by W. O. Bentley from his earlier Bentley BR.1. Coming as it did near the end of the war, the BR.2 was built in smaller numbers than the earlier BR.1 - its main use being by the Royal Air Force in the early nineteen twenties. . . . More Information