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The Akaflieg Stuttgart FS-31 is a tandem seat, dual control training glider designed and built in Germany in 1980. The aircraft was intended to have high performance, yet to be robust enough for student use. It was not intended for production and remains in service with the Akaflieg after some 30 years and 6,000 flying hours. ==Design and development== The Akaflieg Stuttgart or Akademische Fliegergruppe Stuttgart ((英語:The Stuttgart Academic Flying Group)) is one of some fourteen German student flying groups attached to and supported by their home Technical University. Several have designed and built aircraft, often technically advanced and leading the development of gliders in particular.〔 The students of the Stuttgart Akaflieg designed the FS-31 as a high performance, tandem seat training sailplane to replace their earlier aircraft, using the then new carbon Kevlar hybrid material to reduce the weight. Energy dissipation and a locally strong cockpit area were further design objectives. Benign stall characteristics and a strong, long-stroke, monowheel undercarriage also make it suitable for student pilots.〔〔 The FS-31 has mid-mounted, straight tapered wings with 4° of dihedral, fitted with spoilers. Its T-tail has a narrow chord, weakly tapered tailplane. Instructor and pupil sit in tandem in a cockpit placed forward of the wing, fitted with dual controls, under a long, single piece canopy. The fuselage, which narrows to a slender boom behind the wing trailing edge, is similar to that of the Akaflieg Stuttgart FS-29, though carbon/Kevlar replaces the earlier aircraft's GRP polymeric foam sandwich structure.〔〔 The FS-31 first flew on 30 December 1980. Some improvements were made to the wing root-fuselage junction during flight testing in the summer of 1980.〔 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「Akaflieg Stuttgart FS-31」の詳細全文を読む スポンサード リンク
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