Tupolev Tu-12 - Development

Development

The Tupolev Tu-73 jet-engined bomber project was suffering delays in early 1947 and Tupolev suggested re-engining the Tu-2 medium bomber with imported British Rolls-Royce Nene jet engines to produce a jet bomber as quickly as possible. Design work began well before official approval was received on 31 May 1947 for one Tu-2S to be converted in the OKB's workshop and another five to be converted at Zavod (Factory) Nr. 23, but construction of the prototype had already begun in early May under the bureau designation Tu-77.

Changes from the standard Tu-2 were minimized to speed production and they consisted of the following:

  • Two Nene jet engines replaced the standard Shvetsov ASh-82FN radial engines.
  • The wing dihedral was reduced to 3° from 6°.
  • The fuselage was lengthened 400 mm (16 in) and the rear fuselage was heightened by 300 mm (12 in).
  • A new tricycle undercarriage was fitted, with the main gear units retracting into the engine nacelles.
  • Additional fuel tanks were fitted and the design of the tanks was changed to accommodate the change from gasoline to kerosene.
  • The control system was revised and trim tabs were fitted to the elevators.
  • The wing and tail were reinforced.
  • The 20 mm (0.79 in) ShVAK cannon were removed from the wing roots and a 23 mm (0.91 in) Nudelman-Suranov NS-23 cannon was mounted in an external fairing on the starboard side of the nose.

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