page_title: Kalinin K-7
section_title: Specifications (K-7)
hierarchical_section_title: Kalinin K-7 / Specifications (K-7)
caption_attribution_description: English: this a RC replica of Kalinin K-7,Soviet heavy bomber of 1930's
context_page_description: The Kalinin K-7 was a heavy experimental aircraft designed and tested in the Soviet Union in the early 1930s. It 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 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, two more engines were added to the trailing edges of the wing, one right and one left of the central passenger pod. Nemecek states in his book that at first only one further pusher engine was added.
context_section_description: Data from Istoriya konstruktskii samoletov v SSSR do 1938 g. (3 izd.), The Osprey Encyclopedia of Russian Aircraft 1875-1995
  General characteristics
  Crew: 11 (2 pilots, navigator/bombardier, radio operator/gunner (nose 20mm cannon), flight engineer, 4x gunners (twin DA machine-guns in four gondola positions), 2x gunners (20 mm cannon in tail boom tips)
  Capacity: (120 passengers / 7,000 kg (15,432 lb) cargo, in civilian configuration)
  Length: 28 m (91 ft 10 in)
  Wingspan: 53 m (173 ft 11 in)
  Height: 12.4 m (40 ft 8 in) (estimated to top of engine nacelle)
  Wing area: 454 m² (4,890 sq ft)
  Aspect ratio: 6.2
  Airfoil: root:  TsAGI R-II (22%) ; tip: TsAGI R-II (19%)
  Empty weight: 24,400 kg (53,793 lb)
  Gross weight: 38,000 kg (83,776 lb) normal
  42,400 kg (93,500 lb) maximum bombload
  Max takeoff weight: 46,500 kg (102,515 lb)
  Fuel capacity: 9,130 l (2,410 US gal; 2,010 imp gal) in wing tanks
  Powerplant: 7 × Mikulin AM-34F V-12 liquid-cooled piston engines, 560 kW (750 hp) each
  Propellers: 2-bladed fixed-pitch propellers
  Performance
  Maximum speed: 225 km/h (140 mph, 121 kn)
  Cruise speed: 180 km/h (110 mph, 97 kn)
  Range: 1,600 km (990 mi, 860 nmi)
  Service ceiling: 4,000 m (13,000 ft)
  Wing loading: 84 kg/m² (17 lb/sq ft)
  Power/mass: 0.084 kW/kg (0.051 hp/lb)
  Armament
  Guns: 
  3x 20 mm (0.79 in) cannon (at least)
  8x 7.62 mm (0.30 in) machine guns (at least)
  Bombs: maximum 19,000 kg (42,000 lb) of bombs
caption: A detailed scale model of the K-7
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