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The Horten H.III was a flying wing sailplane built by Walter and Reimar Horten in Germany from 1937 to 1944. ==Design== The H.III series was an incremental development of the Horten H.II with reduced sweepback of 23°, span increased to 20 m (65 ft 7in) and modified lateral controls. The wing trailing edges had three movable surfaces; the innermost was a landing flap, but the outer pair were geared differential elevons with the outer elevon having a large upward deflection and only slight downward movement, conversely, the inner elevon had large downward movement and slight upward movement.〔 This arrangement reduced unfavourable yawing moments due to aileron by making use of differential aileron movement, but avoided the change in longitudinal trim by the opposing differential of the inner flap pair. In high speed flight the nose down trim was provided mainly by the inner elevon section moving downwards, the outer flap deflecting only slightly; this had the advantage of relieving the tips of torsional loads at high speed. Drag rudders, similar to airbrakes fitted in modern gliders, were fitted near the wingtips, providing yaw control similar to those used in the H.II.〔 The first two H IIIs, a IIIa and a IIIc (w/n 10 & 11) were built in workshops at Cologne in 1938. Subsequent H.IIIs were built at various locations including Peschke Flugzeugban in Berlin, Fürth, Giebelstadt, Minden, Bonn and Göttingen. Built specifically for the 1938 Rhön competitions the H.IIIa was found to have unsatisfactory turning performance, so the H.IIIc, to be flown by Werner Blech, was modified with a canard surface mounted above and in front of the cockpit to assist with pitch control at low speeds.〔Myhra, David. ''The Horten Brothers”. Atglen PA, USA. 1998. ISBN 0-7643-0441-0. Library of Congress 97 68960〕 Aerodynamic balance for control surfaces was by geared tab on the IIIa and b, but on IIId, f, and g the outer flap had a 20% Frise nose which also countered adverse yaw: out-of-balance aerodynamic loads on the elevators were trimmed by a rubber bungee trimmer with the trim datum set by the pilot.〔 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「Horten H.III」の詳細全文を読む スポンサード リンク
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