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Siemens-Schuckert D.I
The Siemens-Schuckert D.I was a single-seat fighter built by Siemens-Schuckert Werke in 1916. It was a German copy of the French Nieuport 17 that was obsolete by the time it was available in numbers, so that it served mainly as an advanced trainer.
==Design and development==
The French Nieuport 17 fighter, which reached the front in March 1916, established such ascendency over existing German fighters that captured examples were supplied to several German aircraft manufacturers with a request to "study" the type.〔 The Siemens-Schuckert Werke produced the D.I, based very closely on the Nieuport. The most important difference from the Nieuport 17 was the powerplant - instead of the Le Rhone 9J of the Nieuport (licensed and un-licensed versions of which were actually available in Germany at the time), Siemens-Schukert chose to use their own 110 hp (82 kW) Siemens-Halske Sh.I rotary engine - in which the cylinders, still attached to the propeller, rotated at 900 rpm in one direction, with the crankshaft and internals rotating ''in the opposite direction'' at the same rate: producing an effective 1800 rpm. Visually, the effect of this was that in place of the Nieuport 17's circular, fully "closed" cowling the D.I had a small, close fitting, semi-circular cowling with an open bottom, to allow adequate cooling for the slow revving Siemens-Halske. This gives some photographs of the type the appearance of the earlier Nieuport 11.
The wing area (14.4m²) was a little less than the famous 15m² of the Nieuport - the gap between the wings was reduced slightly, and the interplane struts were of steel tube, with broad wooden fairings, in place of the well-known tape bound struts of the original.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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