who was the first british pilot to break the sound barrier
Sound barrier Meanwhile, test pilots achieved high velocities in the tailless, swept-wing de Havilland DH 108. One of them was Geoffrey de Havilland, Jr. who was killed on 27 September 1946 when his DH 108 broke up at about Mach 0.9.[26] John Derry has been called "Britain's first supersonic pilot"[27] because of a dive he made in a DH 108 on 6 September 1948.