The Fokker T.IX was Fokker's first all-metal bomber and was designed to succeed the Martin bombers used by the Royal Dutch East Indies Army. In September 1939 the T.IX made its maiden flight. It had a maximum speed of 440 kph, an armament of three machine guns, and carried a 2, 000kg bomb load. In May 1940 it fell into German hands, but they were only interested in its Bristol Hercules sleeve-valve engines. Only the prototype was completed.