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The Yakovlev Yak-11 (NATO reporting name: "Moose", (ロシア語:Як-11)) is a trainer aircraft used by the Soviet Air Force and other Soviet-influenced air forces from 1947 until 1962. It was produced in 1946-1950 in USSR and in 1949-1953 in Czechoslovakia. A total of 4,566 were built (including 200 in Czechoslovakia), and about 120 still flying today. ==History== The Yakovlev design bureau began work on an advanced trainer based on the successful Yak-3 fighter in mid 1944, although the trainer was of low priority owing to the ongoing Second World War.〔Gunston 1995, p. 469.〕 The first prototype of the new trainer, designated Yak-UTI or Yak-3UTI flew in late 1945. It was based on the radial-powered Yak-3U, but with the new Shvetsov ASh-21 seven-cylinder radial replacing the ASh-82 of the Yak-3U.〔Gordon Komissarov and Komissarov 2005, p. 249.〕 It used the same all-metal wings as the Yak-3U, with a fuselage of mixed metal and wood construction. Pilot and observer sat in tandem under a long canopy with separate sliding hoods. A single synchronised UBS 12.7 mm machine gun and wing racks for two 100 kg (220 lb) bombs comprised the aircraft's armament.〔Gunston and Gordon 1997, p. 97.〕 An improved prototype flew in 1946, with revised cockpits and a modified engine installation with the engine mounted on shock absorbing mounts.〔 This aircraft successfully passed state testing in October 1946, with production beginning at factories in Saratov and Leningrad in 1947.〔Gunston and Gordon 1997, p. 99.〕 Production Yak-11s were heavier than the prototypes, with later batches fitted with non-retractable tail wheels and revised propellers. A 7.62 mm ShKAS machine gun was sometimes fitted instead of the UBS, while some were fitted with rear-view periscopes above the windscreen.〔 In total, Soviet production amounted to 3,859 aircraft between 1947 and 1955. with a further 707 licence-built by Let in Czechoslovakia as the C-11.〔Gordon Komissarov and Komissarov 2005, pp. 250–251.〕 The Yak-11 set five world-class records. 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「Yakovlev Yak-11」の詳細全文を読む スポンサード リンク
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