Royal Air Force centenary celebrations must include Bentley. Better remembered now for cars than aero engines, at its creation on 1 April 1918 Lieutenant Walter Owen Bentley Royal Naval Volunteer Reserve (RNVR) became Captain WO Bentley RAF among all 50,000 Royal Naval Air Service (RNAS) personnel transferred into the new service. A lot of its 2,500 aircraft were equipped with engines for which in 1919 the Royal Commission on Awards to Inventors granted WO £8,000 [£156,000].