What might be considered as the final variation on the
original HD.1 concept was the HD.12 single-seat fighter
that commenced its flight test programme in 1921. A
single-bay staggered biplane, the HD.12 was powered
by the 170hp Le Rhone 9R nine-cylinder rotary air-cooled
engine, and its intended armament was the
standard pair of synchronised 7.7mm Vickers machine guns. The HD.12 was considered to be somewhat passe
by the time it commenced flight testing, and, having a
comparatively poor performance, it was quickly discarded.
| Wingspan||8.70 m||29 ft 7 in|
| Length||5.94 m||20 ft 6 in|
| Height||2.50 m||8 ft 2 in|
| Wing area||19.00 m2||204.51 sq ft|
| Max. speed||190 km/h||118 mph|
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