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 by Volkswagen Group by customer demand. Renamed the L675, it remains under continuous development, despite an attempt to replace it with the 6.0L W12 Volkswagen engine. The Bentley brand and all former Rolls-Royce and Bentley automotive manufacturing assets have been owned by Volkswagen AG since 1998. "For further detail of the L Series V8 engines developed since the 1950s for use in Rolls-Royce (to 1998) and Bentley (ongoing) automobiles, see Rolls-Royce - Bentley L Series V8 engine" Around 1987, the requirement for a more modern, downsized V8 engine was identified. Engine designers Derek Jackson and Geoff Attwood performed the majority