Aero Flight 1944 L-R, Martindale, Nelson,Brown and Weightman
The highest accurately recorded dive speed in a piston-engined fighter was Mach 0.91 (620 mph at 27,000 ft), recorded in Spitfire Mk.XI EN 409 by Squadron Leader A.F. "Tony" Martindale during a high-speed dive test from 40,000 feet at Farnborough on April 27, 1944. The aircraft lost its propeller and reduction gear, but in an extraordinary display of airmanship, Martindale managed to glide the aircraft back to base and land safely!