World War II
Ricardo’s work on the sleeve valve affected the development of British aircraft engines in the thirties and during the war. He even enhanced the famous Rolls-Royce Merlin engine in the Mosquito by giving it an oxygen enrichment system to improve its performance.
Ricardo's work exerted influence all around the world. While his work guaranteed England a supply of fuels of ever-increasing power during the 1930s, it also helped Germany to develop synthetic high-octane aviation fuel, for example for the Focke-Wulf Fw 190 which inflicted heavy losses among the RAF's Supermarine Spitfires in 1942. Likewise, Ricardo's research on the detonation-inhibiting qualities of water injection was exploited by German engineers (MW 50) to provide their aero-engines with a particularly powerful special emergency power rating.
During 1941-5 Ricardo was a member of the War Cabinet engineering advisory committee.
Ricardo also assisted in the design of the combustion chambers and fuel control system of Sir Frank Whittle’s jet engine.
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