Rolls-Royce Limited increase its own production rates. By the late 1920s, aero engines made up most of Rolls-Royce's business. Henry Royce's last design was the Merlin aero engine, which was first flown in prototype form in 1935, although he had died in 1933. This was developed from the R engine, which had powered a record-breaking Supermarine S.6B seaplane to almost in the 1931 Schneider Trophy. The Merlin was a powerful supercharged V12 engine and was fitted into many World War II aircraft: the British Hawker Hurricane, Supermarine Spitfire, de Havilland Mosquito (twin-engine), Avro Lancaster (four-engine) (a development of the Avro Manchester with
Rolls-Royce V8 engine Rolls-Royce V8 engine In the history of Rolls-Royce automobiles, only two distinct series of V8 engines have been produced. The first powered the 1905 "V-8" model and was made in very small numbers. The second was developed in the 1950s and was known internally as the "L Series" of engines. The L Series V8, in highly developed form, continues to power Bentley automobiles into the 21st century. Three 1905 Rolls-Royce V-8 automobiles were manufactured using the company’s first V-8 engine design but only one example was sold, a car using the two seat "Legalimit" body. This proved unreliable and was