Design of the T.IX was started in 1938 as the company's first all-metal bomber project. It was a mid-wing monoplane with twin fins and rudders and retractable landing gear,[1] powered by two 1375 hp (1025 kW) Bristol Hercules radial piston engines. The T.IX first flew on 11 September 1939, but in April 1940 during testing it was damaged when it collided with a hangar door.[1] The subsequent German invasion of the Netherlands stopped repair and further development.[1]
Hazewinkel, Harm J. (December 1977). "Le Fokker T-IX: C'était le premier avion métallique néerlandais" [The Fokker T-IX: The First Metallic Dutch Aircraft]. Le Fana de l'Aviation (in French) (97): 8–10. ISSN0757-4169.