DH.51
The sole remaining airworthy DH.51, G-EBIR, at theShuttleworth Collection
General information
Type	Touring biplane
Manufacturer	de Havilland
Number built	3
History
First flight	1924

Thede Havilland DH.51 is a 1920s British three-seat touringbiplane built byde Havilland atStag Lane Aerodrome,Edgware.

De Havilland designed theDH.51 as an economical touring biplane, based on the 90 hp (67 kW)RAF 1Aengine which was available fromwar-surplus stocks. The aircraft first flew in July 1924; it performed well but because it did not have adual-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 anADC Airdisco 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 theDH.51A. It was exported to Australia and later converted to a floatplane as theDH.51B.

The first aircraft was exported to Australia in 1927, as a floatplane it capsized inSydney Harbour in January 1931.The second aircraft remained in the UK until it was scrapped in 1933.A third and final aircraft was built in 1925 and exported toKenya in 1929, having the honour of being the first aircraft on the Kenyan civil register asVP-KAA. After 40 years of service it returned by air freight to the UK in 1965 where it was restored by Hawker-Siddeley Aviation atHawarden. It was then put on the UK register asG-EBIR and passed toThe Shuttleworth Collection in Bedfordshire where it remains in an airworthy condition to this day.

The third aircraft (registeredG-EBIR and namedMiss Kenya; built in 1925) remains airworthy with theShuttleworth Collection, Old Warden, England and can be seen at flying events throughout the summer months. It is still powered by an Airdisco (Renault) 120hp V-8 engine driving a fixed pitch 4-bladed wooden propeller.

Data from De Havilland Aircraft since 1909^[1]

General characteristics

• Crew: 1
• Capacity: 2 passengers
• Length: 26 ft 6 in (8.08 m)
• Wingspan: 37 ft 0 in (11.28 m)
• Height: 9 ft 9 in (2.97 m)
• Wing area: 325 sq ft (30.2 m²)
• Empty weight: 1,342 lb (609 kg)
• Gross weight: 2,240 lb (1,016 kg)
• Powerplant: 1 ×ADC Airdisco V-8 air-cooled piston engine, 120 hp (89 kW)
• Propellers: 4-bladed fixed-pitch

Performance

• Maximum speed: 108 mph (174 km/h, 94 kn)
• Stall speed: 43 mph (69 km/h, 37 kn)
• Service ceiling: 15,000 ft (4,600 m)
• Rate of climb: 960 ft/min (4.9 m/s)

• List of de Havilland aircraft

• The Illustrated Encyclopedia of Aircraft (Part Work 1982–1985). Orbis Publishing.
• Jackson, A.J. (1973).British Civil Aircraft since 1919 Volume 2. London: Putnam.ISBN 0-370-10010-7.
• Jackson, A.J. (1987).De Havilland Aircraft since 1909 (Third ed.). London: Putnam.ISBN 0-85177-802-X.

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