Tupolev Tu-75

Tupolev Tu-75

Role: transport
National origin: Soviet Union
Manufacturer: Tupolev
First flight: 21 January 1950
Status: canceled
Number built: 1

The Tupolev Tu-75 was a military transport variant of the Tu-4 bomber, as was a similar airliner, the Tu-70, both using a new, purpose-designed fuselage. The first Soviet military machine of this class, it was equipped with a rear fuselage loading ramp. It was not placed into production because the VVS decided it would be cheaper to modify its existing Tu-4s for the transport mission and to use its existing Lisunov Li-2 and Ilyushin Il-12 transports.

Development

The Tupolev OKB began work in September 1946 on a military transport version of the Tupolev Tu-70 airliner and this was confirmed by the Council of Ministers on 11 March 1947 with state trials to begin in August 1948. To expedite the process the maximum use was made of the components of the Tu-70. Its engines were the uprated Shvetsov ASh-73TKFN or TKNV fuel-injected version. A new, narrower fuselage was designed which included a rear cargo hatch, a vehicle loading ramp and paratroop exit doors. Three gun turrets, dorsal, ventral and tail, were to be adapted from the Tu-4, although they were not fitted on the prototype. It had a crew of six, three gunners, a radio-operator, a navigator and two pilots.

The aircraft was intended for three different roles; transport, parachute transport and aerial ambulance. In the first role it was designed to carry two ASU-76 assault guns, two STZ NATI artillery tractors, six or seven GAZ-67B jeeps or five 85 mm (3.3 in) guns without their prime movers or any combination of equipment up to 12,000 kg (26,000 lb). To facilitate the loading of cargo a winch was mounted on the ceiling of the cargo hold with a capacity of 3,000 kg (6,600 lb). It could carry either 120 troops, 96 fully loaded paratroopers or 64 standard parachute loads. As an aerial ambulance it could carry 31 stretchers and four medical attendants.

Construction of the first prototype was quite prolonged as it was not finished until November 1949 with its first flight taking place on 21 January 1950. It finished its manufacturer's trials the following May, but Tupolev decided not to submit it for the State acceptance trials as the VVS had already decided that it would be cheaper to rely on its existing transports and to modify Tu-4 bombers for the cargo role. The prototype was used by the MAP (Ministerstvo Aviatsionnoy Promyshlennosti - Ministry of Aviation Industry) until it crashed in October 1954.

Specifications

Data from Gunston, Tupolev Aircraft since 1922

General characteristics

Crew: 6
Length: 35.61 m (116 ft 10 in)
Wingspan: 43.83 m (145 ft 2â…› in)
Height: 9.05 m (29 ft 8¼ in)
Wing area: 167.2 m² (1800 ft²)
Empty weight: 37,810 kg (83,355 lb)
Loaded weight: 56,660 kg (124,912 lb)
Useful load: 12,000 kg (26,455 lb)
Max takeoff weight: 65,400 kg (144,180 lb)
Powerplant: 4x— Shvetsov ASh-73TKFN 18-cylinder two-row radial engine, 1976 kW (2650 hp) each

Performance

Maximum speed: 545 km/h (339 mph)
Cruise speed: km/h (knots, mph)
Stall speed: km/h (knots, mph)
Range: 4140 km (2573 mi)
Service ceiling: 9500 m (31,170 ft)
Rate of climb: m/s (ft/min)
Wing loading: kg/m² (lb/ft²)
Power/mass: W/kg (hp/lb)

Armament

7 x 20 mm Berezin B-20 cannon (planned)

Related development

Tupolev Tu-4
Tupolev Tu-70
Tupolev Tu-80
Tupolev Tu-85

Comparable aircraft

C-97 Stratofreighter

Bibliography

Gordon, Yefim; Rigamant, Vladimir (2005). OKB Tupolev: A History of the Design Bureau and its Aircraft. Hinckley, England: Midland Publishing. ISBN 1-85780-214-4.
Gunston, Bill (1995). Tupolev Aircraft since 1922. Annapolis, MD: Naval Institute Press. ISBN 1-55750-882-8.

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Source: WikiPedia