Fokker D.X

The Fokker D.X, also called the D.10 or V.40, was a Dutch fighter designed after the First World War as an enlarged development of the parasol-monoplane D.VIII that Reinhold Platz had designed at Fokker in 1918. The D.VIII had a rotary engine of only 82 kW but good flying qualities, and about 60 were built in Germany; after the war Anthony Fokker moved his factory to the Netherlands and production continued there with the D.X, which saw limited success. It was armed with two 7.92 mm machine guns and powered by a Hispano-Suiza 8Fb V-8 water-cooled piston engine of 223 kW, giving about 225 km/h. Ten were sold to Spain and one to Finland, where it was used in 1923 and 1924, and a version called the Fokker V-40 with a 400 horsepower Liberty 12-cylinder engine was offered to the US Army Air Service, which was finally dissatisfied with it in April 1923.