The de Havilland DH.51 is a 1920s British three-seat touring

biplane A biplane is a fixed-wing aircraft with two main wings stacked one above the other. The first powered, controlled aeroplane to fly, the Wright Flyer, used a biplane wing arrangement, as did many aircraft in the early years of aviation. While ...

built by

de Havilland The de Havilland Aircraft Company Limited () was a British aviation manufacturer established in late 1920 by Geoffrey de Havilland at Stag Lane Aerodrome Edgware on the outskirts of north London. Operations were later moved to Hatfield in H ...

Stag Lane Aerodrome Stag Lane Aerodrome was a private aerodrome between 1915 and 1933 in Edgware, north London, UK. History The land for an aerodrome was purchased by the London & Provincial Aviation Company (Warren and Smiles - Michael Geoffrey Smiles of Bonning ...

Edgware Edgware () is a suburban town in northern Greater London, mostly in the London Borough of Barnet but with small parts falling in the London Borough of Harrow and in the London Borough of Brent. Edgware is centred north-northwest of Charing Cros ...

Design and development

De Havilland designed the DH.51 as an economical touring biplane, based on the 90 hp (67 kW) RAF 1A

engine An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy. Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power gen ...

which was available from

war War is an intense armed conflict between states, governments, societies, or paramilitary groups such as mercenaries, insurgents, and militias. It is generally characterized by extreme violence, destruction, and mortality, using regular o ...

-surplus stocks. The aircraft first flew in July 1924; it performed well but because it did not have a dual-ignition system it was refused a certificate of airworthiness. As it would have taken at least ten hours of flight testing to certify it with a single-ignition system, de Havilland decided to re-engine the aircraft instead. The aircraft was fitted with an

ADC Airdisco The ADC Airdisco is a British V-8 aero engine that first ran in 1925. Design and development The 'Airdisco' was developed from the French Renault 70 hp aero engine by Frank Halford of the Aircraft Disposal Company, the main difference being t ...

Air-cooled V8 piston engine, which considerably improved performance but was no longer cheap to operate. As a result, only three aircraft were built. The first aircraft was fitted with single-bay wings and was designated the DH.51A. It was exported to Australia and later converted to a floatplane as the DH.51B.

Operational service

The first aircraft was exported to Australia in 1927, as a floatplane it capsized in

Sydney Harbour Port Jackson, consisting of the waters of Sydney Harbour, Middle Harbour, North Harbour and the Lane Cove and Parramatta Rivers, is the ria or natural harbour of Sydney, New South Wales, Australia. The harbour is an inlet of the Tasman Sea (p ...

in January 1931. The second aircraft was used in Britain until it was scrapped in 1933. The third aircraft was exported to

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in 1929. It returned to Britain in 1965 and is still in use today.

Surviving aircraft

The third aircraft built (registered G-EBIR and named ''Miss Kenya''; built in 1925) is still airworthy and on public display at the

Shuttleworth Collection The Shuttleworth Collection is a working aeronautical and automotive collection located at the Old Warden Aerodrome, Old Warden in Bedfordshire, England. It is the oldest in the world and one of the most prestigious, due to the variety of old a ...

, Old Warden, England.

Specifications (DH.51 Airdisco engine)

References

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External links