Halford also later designed the de Havilland Gipsy aero engine, designed the first turbo charged racing car engine, the Halford Special and one of the first jet engines, the Halford H.1 later developed by de Havilland as the de Havilland Goblin.
During this period Frank Halford also designed and had built the AM Halford Special racing car which he raced at Brooklands in the 1926 RAC British Grand Prix, as well as in many other races in 1925 and 1926.
The early racing history of chassis number 1916 is not fully documented but what is certain is that it was crashed in 1924 and Major Frank Halford bought the chassis and installed an engine of his own design and built a new two-seater body for the car.
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In the 1930s the Halford Special was dismantled by its new owner, Viscount Ridley.
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