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The Caudron Type D was a French pre-World War I single seat, twin-boom tractor biplane, a close but slightly smaller relative of the two seat Caudron Type C. More than a dozen were completed, one exported to the United Kingdom, where they may also have been licence built, and three to China. ==Design and development== In late 1911 W.H. Ewen acquired the right to supply Caudron aircraft in the U.K. and in Ewen Aviation's 1913 catalogue the single seat Type D appears on the page labelled Type C; though the latter was a two-seater, the two types appear to have been closely related. Both were twin boom, tractor biplanes, which began with equal upper and lower spans but were later modified into sesquiplanes. Both were single-seaters, with engine and pilot in an interwing nacelle. In contrast to the Type C, the Type D was a little smaller and lighter and in its early months was powered by the low power () 3-cylinder Anzani radial engine. After modification to a sesquiplane, the upper to lower span ratio of the Type D was smaller than that of the Type C.〔 The Type D was a two bay biplane with an inner bay only about half the width of the outer. Both two spar fabric covered wings had rectangular plans apart from angled tips. There was no stagger, so the two sets of parallel interplane struts were parallel and vertical. The upper wing overhang produced by the sesquiplane modification was supported by extra parallel pairs of outward leaning interplane struts. Wire bracing completed the structure. The rear spar was ahead of mid-chord, leaving the ribs in the rear part of the wing flexible and allowing roll control by wing warping.〔 The nacelle was a simple, short, flat sided structure. It was supported above the lower wing on two more pairs of interplane struts which passed within the nacelle. The Anzani engine was mounted uncowled at the front, with the pilot seated under the trailing edge.〔 The empennage of the Type D was supported on a pair of girders arranged parallel to one another in plan. The upper girder members were attached to the upper wing spars at the tops of the innermost interplane struts and the lower ones ran under the lower wing, mounted on downward extensions of the inner interplane struts. The mounting was strengthened with two diagonal struts on each side, one from the base of the forward interplane strut to the upcurved tip of the lower member and the other from the rear interplane strut to the junction of the lower member and its first vertical cross member. Each of these lower members, which supported the aircraft on the ground as skids, carried twin, rubber sprung landing wheels. Behind the wing the upper and lower members converged to the rear; the drag on the lower members reduced the landing run. There were three vertical cross braces on each girder but the only lateral inter-girder cross-members were near the tail, though there was wire bracing. The broad chord tailplane was mounted a little below the upper girder member with a pair of round-cornered rectangular rudders above it.〔 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「Caudron Type D」の詳細全文を読む スポンサード リンク
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