The Fokker S.IX was a military trainer aircraft produced in the Netherlands in the mid-1930s, designed at a

Royal Netherlands Navy The Royal Netherlands Navy ( nl, Koninklijke Marine, links=no) is the naval force of the Kingdom of the Netherlands. During the 17th century, the navy of the Dutch Republic (1581–1795) was one of the most powerful naval forces in the world an ...

request for a machine to replace the obsolete

Fokker S.III The Fokker S.III was a biplane trainer aircraft of the 1920s. It was of conventional configuration, seating the pilot and instructor in tandem, open cockpits. The single-baywings were staggered and of unequal span. In 1927, Fokker's US subsi ...

s then in service. It was a conventional,

single-bay A biplane is a fixed-wing aircraft with two main wings stacked one above the other. The first powered, controlled aeroplane to fly, the Wright Flyer, used a biplane wing arrangement, as did many aircraft in the early years of aviation. While a ...

biplane with staggered wings of unequal span braced with N-struts. The pilot and instructor sat in tandem, open cockpits and the undercarriage was of fixed, tailskid type with divided main units. The wing had a wooden structure, the fuselage one of welded steel tube, and the entire aircraft was fabric-covered. The Navy approved the design and ordered 27 aircraft, later reducing this to 15. The Royal Netherlands Army Aviation Group ordered 20 examples with a different engine, following this with an order for a second batch of 20. None of these latter aircraft were delivered by the time of the German invasion of the Netherlands in 1940. On 14 May that year, a few surviving Army S.IXs escaped to France alongside some S.IVs, but never flew again. Following the war, air charter company Frits Diepen Vliegtuigen ordered three more aircraft, which were used to train pilots into the 1950s.

Variants

* S.IX/1 - version with

Armstrong Siddeley Genet Major The Armstrong Siddeley Genet Major is a British five-cylinder (later seven-cylinder), air-cooled, radial engine for aircraft, designed and built by Armstrong Siddeley and first run in 1928. It developed 140 horsepower (104 kW). In Royal A ...

engine for Army * S.IX/2 - version with

Menasco Buccaneer The Menasco Buccaneer was a series of popular six-cylinder, air-cooled, in-line, inverted, aero-engines, that were manufactured by Menasco Motors Company for light general aviation and sport aircraft during the 1930s and 1940s. The six-cylinde ...

engine for Navy

Operators

; *

Royal Netherlands Air Force , colours = , colours_label = , march = ''Parade March of the Royal Netherlands Air Force'' , mascot = , anniversaries = , equipment ...

Specifications (S.IX/1)

References

* * {{Fokker aircraft 1930s Dutch military trainer aircraft S.IX Aircraft first flown in 1937 Single-engined tractor aircraft Biplanes