Frank Halford

Frank Halford
Born	(1894-03-07)7 March 1894 Nottingham
Died	16 April 1955(1955-04-16) (aged 61) Northwood, Middlesex, England
Nationality	English
Education	Felsted School University of Nottingham
Engineering career
Engineering discipline	aero engine designer
Significant projects	de Havilland Gipsy, de Havilland Goblin, de Havilland Ghost, de Havilland Gyron, Napier Rapier, Napier Dagger, Napier Sabre

Major Frank Bernard Halford CBE FRAeS (7 March 1894 – 16 April 1955) was an English aircraft engine designer. He is best known for the series of de Havilland Gipsy engines, widely used by light aircraft in the 1920s and 30's.

Career

Educated at Felsted, In 1913 he left the University of Nottingham before graduating in order to learn to fly at the Bristol Flying School at Brooklands, later becoming a flight instructor for Bristol. In 1914 he joined the Aeronautical Inspection Department of the War Office ^[1]

On the outbreak of the [First World War] he joined the Royal Flying Corps where he fought at the front. Recalled to engineering duties he improved and enlarged the water-cooled six-cylinder Austro-Daimler, producing the 230 hp (170 kW) Beardmore Halford Pullinger (BHP). This engine was further developed by Siddeley-Deasy as the Puma.

In 1922 he rode a 4-valve Triumph Ricardo in the Senior TT, finishing 13th. That same year he was commissioned to produce a luxury motorcycle for Vauxhall. Based on aero-engine principles, it featured an in-line unit construction four cylinder engine, with shaft drive to the rear wheel. Four examples were made, one exists in a private collection in the Isle of Man.

In 1923 he set up his own consultancy in London,^[2] alongside the equally influential engine designer Harry Ricardo. There he designed the famous de Havilland Gipsy air-cooled inline engines, copying the success of the Cirrus Engine company in the general aviation role.

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.

During the 1930s Halford and Harry Ricardo became interested in the sleeve valve as a method of increasing the allowable operating RPM and compression ratio of piston engines, thereby increasing the power from an otherwise smaller engine. Halford worked with Napier & Son on their Sabre design^[3] which would go on to be one of the most powerful piston aero engines, producing 3,500 hp (2.6 MW) from only 2200 cubic inches (36 L) in late-war versions.

During the war he became 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 taken up by 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

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^[4]

References

↑ Dictionary of National Biography Oxford: O.U.P.
↑ Lumsden 2003, p.54.
↑ Lumsden 2003, p.172.
↑ http://www.skomer.u-net.com/projects/turbines.htm#Avon

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 ISBN 1-872922-16-3 (Rolls Royce Heritage Trust. Historical series; no. 28)
Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

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

de Havilland aero engines

Piston engines	Ghost Gipsy Gipsy Junior Gipsy Minor Gipsy Major Gipsy Six Gipsy Queen Gipsy Twelve Gipsy King Iris

Turbojet	Ghost Goblin Gyron Gyron Junior

Turboprop/turboshaft	Gnome Gem

Rocket	Sprite Super Sprite Spectre

Designers	Geoffrey de Havilland Frank Halford

Armstrong Siddeley aero engines

Piston engines	Boarhound Cheetah Civet Cougar Deerhound Genet Genet Major Hyena Jaguar Jaguar Major Leopard Lynx Lynx Major Mongoose Ounce Panther Puma Serval Tiger (V12) Tiger (Radial) Wolfhound

Turbojets	Adder ASX Sapphire Viper

Turboprops	ASP Double Mamba Mamba Python

Rocket engines	Beta Snarler Screamer Stentor Gamma

Authority control	WorldCat Identities VIAF: 78277628

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