David Keith Duckworth (10 August 1933 – 18 December 2005) was an English mechanical engineer. He is most famous for designing the Cosworth DFV (Double Four Valve) engine, an engine that revolutionised the sport of Formula One. Early life and education Duckworth was born in Blackburn, Lancashire, and was educated at Giggleswick School. Duckworth served his two years of national service with the Royal Air Force, during which time he briefly trained to become a pilot but was grounded for dangerous and incompetent flying and was reclassified as a navigator. Duckworth claimed that allergy to medication he was receiving caused his flying problem - in civilian life he became a keen light aircraft and helicopter pilot. After completing his tour of duty, which he finished as a navigator, Duckworth studied engineering at Imperial College London, earning a BSc degree in 1955. Early career After university he began working for Lotus as a gearbox engineer. Given the task of fixing the 'Queerboxs' unreliability problems, he fell out with Chapman who would not support the cost of the fix that Duckworth felt was needed. Cosworth DFV After only three years with Lotus, Duckworth, along with fellow Lotus employee Mike Costin, founded Cosworth, a racing engine design and development firm, in 1958. Costin was obliged to remain with Lotus, having recently signed a restrictive contract; for the first few years Duckworth worked essentially alone at Cosworth until Mike could join him. From the start the company was closely associated with the Ford Motor Company and Lotus, and the two companies found early success in the newly formed Formula Junior in the early 1960s. Not only did these successes finance Cosworth's move from Friern Barnet to Edmonton, then to Northampton but they inspired Lotus founder Colin Chapman to persuade Ford to finance the production of Duckworth's DFV (double four valve) engine. Chapman's idea was to reduce weight by using the engine as a stressed part of the chassis, bolted straight on to the front monocoque tub, removing the need for a spaceframe around the engine and making it easier for mechanics to maintain the cars. This arrangement has been standard in F1 ever since. The DFV made a famous debut in the third race of the season, in the Dutch Grand Prix at Zandvoort. In the back of the Lotus 49, it proved lightning-quick straight out of the box, with Graham Hill taking pole