interested in jet engines, and designed a simplified version of Frank Whittle's centrifugal-flow designs with the air intake on the front and "straight-through" combustion chambers. Known initially as the Halford H.1, the project was undertaken for de Havilland who produced it as the de Havilland Goblin. Halford's company was eventually purchased outright by de Havilland in 1944. Halford continued working on jets, turboprop and rocket engines. Piston engines Beardmore Halford Pullinger ADC Cirrus de Havilland Gipsy de Havilland Gipsy Major Napier Rapier Napier Dagger Napier Sabre Siddeley Puma Jet engines de Havilland H.1 Goblin de Havilland H.2 Ghost de Havilland H.3 - turbopropeller Gipsy replacement, 500 shp de Havilland H.4 Gyron de Havilland H.5 - developed Ghost - not built de Havilland H.6 Gyron Junior de Havilland H.7 - gas generator, later developed as Napier Oryx See also de Havilland Aircraft Museum References J. L. Pritchard, 'Halford, Frank Bernard (1894–1955)', rev. Robin Higham, Oxford Dictionary of National Biography, Oxford University Press, 2004 accessed 9 Sept 2006 Douglas R. Taylor: Boxkite to jet: the remarkable career of Frank B Halford. Derby: Rolls-Royce Heritage Trust, 1999 (Rolls-Royce Heritage Trust. Historical series; no. 28) Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. . External links Frank Halford and the Gipsy design office - Flight magazine, 1938 Jet Propulsion for Civil Aircraft - a 1946 Flight article on a paper presented by Major F. B. Halford, F.R.Ae.S, M.S.A.E. "Major F. B. Halford" Flight 1955 obituary "Frank Bernard Halford, 1894-1955" a 1959 Flight article on Halford 1894 births 1955 deaths Military personnel from Nottingham Royal Flying Corps personnel Alumni of the University of Nottingham Commanders of the Order of the British Empire English aerospace engineers English aviators Fellows of the Royal Aeronautical Society Jet engine pioneers People educated at Felsted School