John Derry

John Derry

John Derry (died 6 September 1952) was a British test pilot, and was the first Briton to exceed the speed of sound. He was killed in the 1952 Farnborough Airshow DH.110 crash where his aircraft broke up due to a design fault, with many fatalities.

He is widely believed to have exceeded the speed of sound on 6 September 1948 when he lost control of his de Havilland DH 108 aircraft and the Mach meter briefly showed supersonic speeds in a shallow dive from 12,195 m (40,000) ft to 9,145 m (30,000) ft., although recording apparatus was switched off.


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