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 Limited Kingdom. Rolls-Royce's competitors were GE and Pratt & Whitney (UTC). Aero engines were then only a part of GE and UTC activities as major industrial groups. At that time Rolls-Royce was organised into five business groups: Bentley Models (from 1933) – chassis only Rolls-Royce Limited Rolls-Royce was a British luxury car and later an aero engine manufacturing business established in 1904 by the partnership of Charles Rolls and Henry Royce. Building on Royce's reputation established with his cranes they quickly developed a reputation for superior engineering by manufacturing the "best car in the world". The First World War brought them