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The Tupolev Tu-12 (development designation Tu-77) was an experimental Soviet jet-powered medium bomber developed from the successful piston-engined Tupolev Tu-2 bomber after the end of World War II. It was designed as a transitional aircraft to familiarize Tupolev and the VVS with the issues involved with jet-engined bombers. ==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.〔Gordon, pp. 117–18〕 Changes from the standard Tu-2 were minimized to speed production and they consisted of the following:〔Gordon, p. 118〕 * 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 and the rear fuselage was heightened by . * 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 ShVAK cannon were removed from the wing roots and a Nudelman-Suranov NS-23 cannon was mounted in an external fairing on the starboard side of the nose. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tupolev Tu-12」の詳細全文を読む スポンサード リンク
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