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De Havilland DH.51
The de Havilland DH.51 is a 1920s British three-seat touring biplane built by de Havilland at Stag Lane Aerodrome, Edgware.
==Design and development==
De Havilland designed the DH.51 as an economical touring biplane, based on the 90 hp (67 kW) RAF 1A engine which was available from war-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 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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