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In 1947 Derry joined de Havilland as a test pilot, working largely on the de Havilland DH 108 aircraft. He is widely believed to have exceeded the speed of sound on 6 September 1948, when he lost control of his aircraft and the Mach meter supposedly 'briefly showed' supersonic speeds in a shallow dive from 12,195 m (40,000 ft) to 9,145 m ...
On 6 September 1952, a prototype de Havilland DH.110 jet fighter crashed during an aerial display at the Farnborough Airshow in Hampshire, England. The jet disintegrated mid-air during an aerobatic manoeuvre, causing the death of pilot John Derry and onboard flight test observer Anthony Richards.
Then, on 6 September 1948, John Derry is thought to have probably exceeded the speed of sound in a shallow dive from 40,000 ft (12,195 m) to 30,000 ft (9,145 m). The test pilot Captain Eric "Winkle" Brown, who escaped a crash in 1949, described the DH 108 as "a killer". [9]
John Derry, another de Havilland test pilot, has been called "Britain's first supersonic pilot", because of a dive he made on 6 September 1948 in a DH 108. [11] Contrary to what is depicted in the film, the first aircraft to break the sound barrier was the rocket-powered Bell X-1 flown by Chuck Yeager of the United States Air Force in 1947.
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