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| The Bleriot SPAD 81 paradoxically preceded the Types
51 and 61, the first prototype having flown at Buc on 13
March 1923. A single-bay staggered biplane of mixed
construction with fabric-covered metal wings and a
wooden monocoque fuselage, the Type 81 was
powered by a 300hp Hispano-Suiza HS 8Fb watercooled
engine and carried an armament of two 7.7mm
MAC (Vickers) machine guns. A production batch of 80
was ordered for France's on 28 March
1924. The Types 81-2 and 81-3, built in prototype form
only and flown on 20 May and 18 August 1924 respectively,
differed primarily in the types of radiator fitted,
and a further prototype, the Type 81-4 flown on 11 September
1924, differed in having wings of wooden construction.
W.Green, D.Swanborough "The Complete Book of Fighters", 2000
 | A three-view drawing (1680 x 1190) |
| MODEL | S.81 |
| CREW | 1 |
| ENGINE | 1 x 300hp Hispano-Suiza 8Fb |
| WEIGHTS |
| Take-off weight | 1265 kg | 2789 lb |
| Empty weight | 845 kg | 1863 lb |
| DIMENSIONS |
| Wingspan | 9.61 m | 32 ft 6 in |
| Length | 6.40 m | 21 ft 0 in |
| Height | 2.90 m | 10 ft 6 in |
| Wing area | 30.00 m2 | 322.92 sq ft |
| PERFORMANCE |
| Max. speed | 235 km/h | 146 mph |
| Cruise speed | 205 km/h | 127 mph |
| Ceiling | 8100 m | 26600 ft |
| Rate of climb | 357 m/min | 1150 ft/min |
| Range | 600 km | 373 miles |
| ARMAMENT | 2 x 7.7mm |
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All the World's Rotorcraft |
