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| Design development of a compact, well-proportioned
two-seat fighter was initiated as the HD.3 in the
autumn of 1917, and a prototype flew before the end of
the year. Powered by the excellent new 260hp Salmson
(Canton-Unne) 9Za radial, the HD.3 had an armament of
two fixed synchronised 7.7mm Vickers guns and two
7.7mm Lewis guns on a flexible mounting for the aftfacing
gunner. A preliminary order was placed on
behalf of the Aviation miiitaire for 120 HD.3s in April
1918, the total subsequently being raised to 300 when it
was also ordered for the Aviation maritime. Few HD.3s
had been delivered, in fact, by the time of the Armistice, but at least 75 were completed for the Aviation miiitaire
and a rather smaller quantity for the naval service. One
example of the HD.3 was fitted with twin floats as the
prototype of the HD.4, series production of which was
frustrated by the Armistice, and a night fighter version
was tested as the HD.3bis. This latter had mainplanes
of thicker section, enlarged ailerons and a revised rudder.
| WEIGHTS |
| Take-off weight | 1180 kg | 2601 lb |
| Empty weight | 760 kg | 1676 lb |
| DIMENSIONS |
| Wingspan | 9.00 m | 30 ft 6 in |
| Length | 6.95 m | 23 ft 10 in |
| Height | 3.00 m | 10 ft 10 in |
| Wing area | 25.50 m2 | 274.48 sq ft |
| PERFORMANCE |
| Max. speed | 192 km/h | 119 mph |
| Ceiling | 5700 m | 18700 ft |
 | A three-view drawing (800 x 554) |
| Timo Ruoko, e-mail, 28.01.2007 20:55 Range is about 500 km reply |
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