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Moscalev SAM-7 Sigma


One of the most innovative fighter designs of the mid-’thirties was the SAM-7 Sigma produced by Aleksandr A Moskalev. Of all-metal stressed-skin construction, the SAM-7 was of tailless configuration. the low-set, two-spar trapezoidal wing carrying endplate vertical surfaces. Powered by a 750 hp M-34 12-cylinder water-cooled engine utilising a combination of retractable and surface evaporation radiators, the SAM-7 was a two-seater, the second crew member occupying an entirely separate compartment and operating twin aft-firing 7,62-mm machine guns, the remaining armament comprising twin forward-firing synchronised guns of similar calibre. The main undercarriage members were manually retractable. The SAM-7 was completed and flown in the spring of 1936, but although it proved stable in the air, it was considered too radical and factory trials were terminated.

Estimated performance figures
Max speed, 302 mph (486 km/h) at 16,405 ft (5 000 m)
Range, 485 mls (780 km)
Empty weight, 2,072 lb (940 kg)
Loaded weight. 3,263 lb (1 480 kg)
Span, 31 ft 6 in (9,60 m)
Wing area, 215.28 sq ft (20,00 sq.m)



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