|
The Fokker D.IX was a Dutch single seat, single engine fighter aircraft, the final, more powerful evolution of the Fokker D.VII World War I success, flown in 1921. The sole example was purchased by the US Army Air Service but judged not worth further development. ==Design and development== The D.IX was the final development of the D.VII, an outstanding World War I fighter. It had a 300 hp (224 kW) Hispano-Suiza 8Fb (Type 42)〔 water-cooled V-8, much more powerful than the standard D.VII's 160 hp (120 kW) Mercedes D III engine and than most other engines experimentally fitted to this airframe. Engine installation apart, the D.VII and D.IX were externally similar apart from their empennages.〔 The D.IX was a single bay biplane, its wings constructed in Fokker's established fashion with two box spars and plywood covering. The interplane struts were N-form; a second N-strut group leant out from the wing root to the upper wing forming, with other, shorter struts from the upper fuselage and nose, a kind of cabane structure to brace the centre of the upper wing. Ailerons were only fitted on the upper planes.〔 Its welded steel tube fuselage was flat sided and deep, with the single seat open cockpit well behind the trailing edge of the upper wing. The straight edged fin and rudder appeared small though the latter extended down to the keel. The strut braced tailplane was placed on top of the fuselage. The D.IX's fixed conventional undercarriage was of the single axle type, with the mainwheels on V-struts. This was much like that of the D.VII but the airfoil shaped axle fairing was expanded and used a fuel tank, an arrangement first tried out in the Fokker V.36. An extra strut from the rear of the tank to the central fuselage underside helped to support it.〔 The D.IX prototype first flew in 1921.〔 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「Fokker D.IX」の詳細全文を読む スポンサード リンク
|