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Siemens-Schuckert D.IV
The Siemens-Schuckert D.IV was a late-World War I fighter aircraft from Siemens-Schuckert (SSW). Considered by many to be the best fighter to see action during the war, it reached service too late and was produced in too few numbers to have any effect on the war effort.
==Earlier designs==
Siemens-Schuckert's first production fighter aircraft was the Siemens-Schuckert D.I, which was based closely on the French Nieuport 17. Apart from the use of the Siemens-Halske Sh.I, a geared rotary engine in which the cylinders and the propeller rotated in opposite directions, the D.I was in fact a fairly literal copy of the Nieuport. By the time production D.Is appeared in 1917, the design was no longer competitive and after 95 had been built, production was cancelled, the type serving mainly as advanced trainers.
Development work on the Siemens-Halske Sh.I culminated in the Siemens-Halske Sh.III, which developed . The new engine was fitted to a series of original prototype designs from the SSW works, the D.II, D.IIa and D.IIb. These featured a much rounder and wider front fuselage to hold the larger engine, leading to a rather stubby-looking aircraft which pilots later referred to as ''the flying beer barrel''. Flight tests started in June 1917, and while the aircraft did not have a very high top speed, they showed outstanding rates of climb. The only serious concern was the extremely long landing gear needed to keep the huge 2-bladed prop clear of the ground.
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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