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The Akaflieg Braunschweig SB-7 Nimbus is a Standard class glider designed and built in Germany in the 1960s. It was one of a series of mixed glass fibre and wood designs from the students of Akaflieg Braunschweig. ==Design and development== The Akaflieg Braunschweig or Akademische Fliegergruppe Braunschweig ((英語:The Brunswick Academic Flying Group)) is one of some fourteen German undergraduate 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 Nimbus was a development of the SB-6 Nixope. The main differences are the shorter span, 15 m rather than 18 m, and the T-tail of the Standard class Nimbus.〔〔 Wing construction was simplified by the introduction of a 3.5 m (11 ft 6 in) long rectangular centre panel.〔 Like its predecessor, the Nimbus was built from a mixture of wood and glass fibre.〔〔 Its shoulder mounted wings are built around box spars with glass fibre flanges and covered with glass fibre laid over balsa. They have an Eppler profile, 2° of dihedral and a taper ratio of 0.49. Schempp-Hirth airbrakes are located at 75% chord. The tail unit is constructed in the same way as the wing and all surfaces are straight tapered. The narrow chord, all-moving tailplane is mounted on top of the fin.〔 The fuselage of the Nimbus is a glass fibre monocoque over balsa. It tapers gently from wing to tail; forward, the cockpit has a long, one piece canopy. The Nimbus has a retractable monowheel undercarriage, assisted by a tailskid.〔 The Nimbus first flew in October 1962.〔 It performed very well, but the Eppler wing profile made it a challenge to fly.〔 The recognition of this problem led to the SB-8 but also to a progressive series of modifications to the SB-7. The Eppler wing profile was replaced by one of Wortmann FX-61-163 form, the span increased to 17.0 m (55 ft 2 in), the tail and fuselage geometry revised. It was also given a reshaped, two piece canopy, improved airbrakes and a tail parachute.〔 Another SB-7 was built by Paul Kummer and Oscar Weisendanger in Switzerland which had yet another new wing of span of 16.52 m (54 ft 2.5 in), an aspect ratio of 20.85 and a different Eppler profile, 417 rather than the original 306.〔 In addition the wing mounted airbrakes were replaced with a landing parachute. This version first flew 20 May 1967〔 and was followed by either one〔 or two〔 more aircraft more prototypes. 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 Braunschweig SB-7 Nimbus」の詳細全文を読む スポンサード リンク
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