Tupolev Tu-75
{{short description|Military transport version of Tu-4 bomber}}
{{good article}}
{{Infobox aircraft
|name= Tu-75
|image= File:Tu-75front.jpg
|caption=
|type= Transport
|national_origin= Soviet Union
|manufacturer= Tupolev
|designer=
|first_flight=21 January 1950
|introduction=
|retired=
|status= Cancelled
|primary_user=
|number_built=1
|developed_from= Tupolev Tu-4/Tupolev Tu-70
|variants=
}}
The Tupolev Tu-75 ({{langx|ru|Туполев Ту-75}}) was a military transport variant of the Tu-4 bomber, an unlicensed, reverse engineered copy of the Boeing B-29 Superfortress. The Tu-75 was similar to the Tu-70 airliner, 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.
Design and 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, maximum use was made of 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 (two pilots, three gunners, a radio operator, and a navigator).
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 {{convert|85|mm|abbr=on}} guns without their prime movers or any combination of equipment up to {{convert|12000|kg|abbr=on}}. To facilitate the loading of cargo, a winch was mounted on the ceiling of the cargo hold with a capacity of {{convert|3000|kg|abbr=on}}. 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.Gordon and Rigamant, p. 108
Operational history
Construction of the first prototype was quite prolonged; the aircraft 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 Soviet Air Force 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 ({{langx|ru|Ministerstvo Aviatsionnoy Promyshlennosti}} – Ministry of Aviation Industry) until it crashed in October 1954.Gordon and Rigamant, p. 109
Specifications
{{Aircraft specs
|ref=The Osprey Encyclopedia of Russian Aircraft 1875-1995Gunston 1995
|prime units?=met
|crew=6
|length m=35.61
|length note=
|span m=43.83
|span note=
|height m=9.05
|height note=
|wing area sqm=167.2
|wing area note=
|aspect ratio=
|airfoil=
|empty weight kg=37810
|empty weight note=
|gross weight kg=56660
|gross weight note=
|max takeoff weight kg=65400
|max takeoff weight note=
|fuel capacity=
|more general=
|eng1 number=4
|eng1 name=Shvetsov ASh-73TKFN
|eng1 type=18-cylinder air-cooled radial piston engines
|eng1 kw=
|eng1 hp=2650
|eng1 note=
|prop blade number=4
|prop name=constant-speed propellers
|prop dia m=
|prop dia note=
|max speed kmh=545
|max speed note=
|max speed mach=
|cruise speed kmh=
|cruise speed note=
|stall speed kmh=
|stall speed note=
|never exceed speed kmh=
|never exceed speed note=
|minimum control speed kmh=
|minimum control speed note=
|range km=4140
|range note=
|combat range km=
|combat range note=
|ferry range km=
|ferry range note=
|endurance=
|ceiling m=9500
|ceiling note=
|g limits=
|roll rate=
|climb rate ms=
|climb rate note=
|time to altitude=
|wing loading kg/m2=338.9
|wing loading note=
|fuel consumption kg/km=
|power/mass={{cvt|0.1395|kW/kg}}
|more performance=
|guns=7 x 20 mm Berezin B-20 cannon (planned)Gordon and Rigamant, p. 107
|avionics=
}}
See also
{{aircontent
|related=
|similar aircraft=
|lists=
|see also=
}}
References
=Notes=
{{reflist|2}}
=Bibliography=
- {{cite book|last1=Gordon|first1=Yefim|last2=Rigamant|first2=Vladimir |title=OKB Tupolev: A History of the Design Bureau and its Aircraft|publisher=Midland Publishing|location=Hinckley, England|year=2005|isbn=1-85780-214-4|name-list-style=amp}}
- {{cite book|last=Gunston|first=Bill|title=The Osprey Encyclopedia of Russian Aircraft 1875–1995|publisher=Osprey|location=London|year=1995|isbn=1-85532-405-9}}
- {{cite book|last=Gunston|first=Bill|title=Tupolev Aircraft since 1922|publisher=Naval Institute Press|location=Annapolis, Maryland|year=1995|isbn=1-55750-882-8}}
{{Tupolev aircraft}}
{{B-29 family}}
Category:1950s Soviet military transport aircraft
Category:Four-engined tractor aircraft
Category:Abandoned military aircraft projects of the Soviet Union