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The DFS Rhönsperber, otherwise known as the Schweyer Rhönsperber or Jacobs Rhönsperber (in English ''Rhön Sparrowhawk'') was a single seat competition glider designed in Germany by Hans Jacobs and first flown in 1935. For several years it was regarded as the best German sailplane and about one hundred were built. ==Design and development== In 1935 Hans Jacobs had been asked by Alexander Lippisch to become chief designer of sailplanes at DFS (Deutsche Forschungsanstalt Für Segelflug) at Darmstadt, after the closure the RRG (Rhön-Rossitten Gesellschaft) at the Wasserkuppe in 1933. The Rhönsperber was not unlike his earlier Rhönbussard, but was enlarged all round, with a repositioned wing and an enclosed cockpit. With a greater aspect ratio, its performance was better.〔 For a few years after its first flight in 1935, the Rhönsperber was held to be the best German competition sailplane.〔 The Rhönbussard had its wing over the cockpit, limiting the pilot's view, but on the Rhönsperber it was lowered to mid fuselage. It is an entirely wood and fabric aircraft with a wing built around a single spar. Forward of the spar the wing is plywood covered around the leading edge, forming a torsion-resisting D-box. Aft of the spar, the covering is fabric. In plan each wing has two sections, a parallel-chord centre section and a double straight tapered outer panel, ending with semi-elliptical tips. The only dihedral, 5°, is on the centre section, forming the gull wing. Airbrakes are centrally placed on the upper centre section surface and fabric-covered ailerons fill the trailing edges of the outer panels.〔 The fuselage is ply covered and of teardrop cross section, deep around the generously dimensioned cockpit.〔〔 The canopy is multi-framed with a rather upright windscreen; the fixed glazing extends rearwards to mid wing and the forward section, including the screen, instruments and a small surrounding portion of the fuselage, hinges to starboard for access. The narrow fin is also ply covered but the rest of the empennage is fabric over wood framing. The rudder, like the fin, is straight tapered with a rounded tip; it extends down to the keel. A straight tapered tailplane and elevators are placed on top of the fuselage, the elevators having a cut-out for rudder movement. The Rhönsperber has no landing wheel, only a curved main skid reaching from the nose to behind mid-chord, and an integral, pronounced tail bumper.〔 Since the DFS built only prototypes,〔 construction of the Rhönsperber was undertaken by Flugzeugbau Schweyer at Ludwigshafen who produced about one hundred.〔 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「DFS Rhönsperber」の詳細全文を読む スポンサード リンク
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