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2009-02-04 23:23:08
Kalinin K-7 (Russian: -7) was a heavy experimental aircraft designed and tested in the Soviet Union in the early 1930s. K-7 was of unusual configuration with twin booms and large underwing pods housing fixed landing gear and machine gun turrets. In the passenger version, seats were arranged inside the 2.3 meter (7 ft 7 in) thick wings. The airframe was welded from KhMA chrome-molybdenum steel. The original design called for six engines in the wing leading edge but when the projected loaded weight was exceeded, the seventh engine was added in the trailing edge of the central pod.[1] K-7 first flew on 11 August 1933. Then on 21 November 1933 the aircraft crashed due to structural failure of one of the tail booms, killing 14 people aboard and one on the ground. Although two more prototypes were ordered in 1933, the project was canceled in 1935 before they could be completed.
2009-02-04 22:14:08
General characteristics Capacity: 120 passengers in civilian configuration Length: 28 m (91 ft 10 in) Wingspan: 53 m (173 ft 11 in) Height: () Wing area: 454 m (4,886.8 ft) Empty weight: 24,400 kg (53,793 lb) Loaded weight: 38,000 kg (83,776 lb) Powerplant: 7 Mikulin AM-34F V-12 piston engines, 560 kW (750 hp) each Performance Maximum speed: 225 km/h (121 knots, 140 mph) Service ceiling 4,000 m (13,123 ft) Wing loading: 84 kg/m (17 lb/ft) Power/mass: 103 W/kg (0.06 hp/lb)