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Fokker Dr.I
The Fokker Dr.I ''Dreidecker'' (triplane) was a World War I fighter aircraft built by Fokker-Flugzeugwerke. The Dr.I saw widespread service in the spring of 1918. It became renowned as the aircraft in which Manfred von Richthofen gained his last 19 victories, and in which he was killed on 21 April 1918.
==Design and development==
In February 1917, the Sopwith Triplane began to appear over the Western Front.〔Franks 2004, p. 9.〕 Despite its single Vickers machine gun armament, the Sopwith swiftly proved itself superior to the more heavily armed Albatros fighters then in use by the ''Luftstreitkräfte''.〔Franks 2004, p. 21.〕〔Leaman 2003, pp. 30, 32.〕 Fokker-Flugzeugwerke responded by converting an unfinished biplane prototype into the V.4, a small, rotary-powered triplane with a steel tube fuselage and thick cantilever wings,〔Leaman 2003, p. 34.〕 first developed during Fokker's government-mandated collaboration with Hugo Junkers/ Initial tests revealed that the V.4 had unacceptably high control forces resulting from the use of unbalanced ailerons and elevators.〔Weyl 1965, p. 226.〕
Instead of submitting the V.4 for a type test, Fokker produced a revised prototype designated V.5. The most notable changes were the introduction of horn-balanced ailerons and elevators, as well as longer-span wings. The V.5 also featured interplane struts, which were not necessary from a structural standpoint, but which minimized wing flexing.〔Weyl 1965, p. 228.〕 On 14 July 1917, ''Idflieg'' issued an order for 20 pre-production aircraft. The V.5 prototype, serial 101/17, was tested to destruction at Adlershof on 11 August 1917.〔Weyl 1965, p. 229.〕
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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