Fokker D IX (PW-6)
1921
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Fokker D IX (PW-6)

The ultimate development of the basic D VII single-seat fighter biplane, the D IX was flown for the first time in 1921 powered by a 300hp Hispano-Suiza 8Fb eight-cylinder water-cooled engine. Of typical Fokker construction in employing a welded steel-tube fuselage and wooden wings each having two box spars, the D IX featured an aerofoil-shaped fuel tank between the main wheels as first tested by the V 36. The sole prototype of the DI X was purchased for evaluation by the US Army Air Service and shipped to the USA in 1922, being assigned the designation PW-6. As evaluated by the USAAS, the aerofoil-section fuel tank was deleted, but the PW-6 was not considered to offer a sufficient advance over the D VII to warrant further development.


Specification 
 WEIGHTS
    Take-off weight1253 kg2762 lb
    Empty weight874 kg1927 lb
 DIMENSIONS
    Wingspan8.99 m30 ft 6 in
    Length7.09 m23 ft 3 in
    Height2.74 m9 ft 0 in
    Wing area22 m2236.81 sq ft
 PERFORMANCE
    Max. speed223 km/h139 mph
    Cruise speed188 km/h117 mph
    Range471 km293 miles

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