Fokker S.IX

The Fokker S.IX was a Dutch training biplane developed in the early 1930s by the aircraft manufacturer Fokker. Conceived as a replacement for the aging S.IV and S.V models, the S.IX first flew in 1933 and entered service with the Royal Dutch Air Force (Luchtvaartafdeling) the following year. Built primarily of wood and fabric, the aircraft featured a conventional two‑bay biplane wing arrangement, fixed tailskid undercarriage, and an open tandem cockpit for instructor and pupil. Power was supplied by a 220 hp (164 kW) Gnome‑Rhône 7K radial engine, giving the S.IX a top speed of roughly 180 km/h (112 mph) and a service ceiling of 4,500 m. Its relatively simple construction and forgiving handling made it an ideal platform for basic pilot instruction, aerobatics, and liaison duties. Only about 60 units were produced before production ceased in 1936, as more modern monoplanes began to replace biplane trainers. Although its operational life was brief, the S.IX contributed to the professionalization of Dutch military aviation in the interwar period and demonstrated Fokker’s continued influence in light aircraft design. The aircraft also saw limited export attempts, with a small number evaluated by the Finnish Air Force, though none were purchased.

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