Fokker S.IX


1st Flight 1937

Crew: Two, pilot and instructor

Length: 7.65 m (25 ft 1 in)

Wingspan: 9.55 m (31 ft 4 in)

Height: 2.90 m (9 ft 6 in)

Wing area: 23.0 m2 (248 sq ft)

Empty weight: 695 kg (1,532 lb)

Gross weight: 975 kg (2,150 lb)

Powerplant: 1 × Armstrong Siddeley Genet Major , 123 kW (165 hp)


Maximum speed: 185 km/h (115 mph, 100 kn)

Range: 710 km (440 mi, 380 nmi)

Service ceiling: 4,300 m (14,100 ft)


The Fokker S.IX was a military trainer aircraft produced in the Netherlands in the mid-1930s, designed at a Royal Netherlands Navy request for a machine to replace the obsolete Fokker S.IIIs then in service.

It was a conventional, single-bay 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.

S.IX/1 – version with Armstrong Siddeley Genet Major engine for Army

S.IX/2 – version with Menasco Buccaneer engine for Navy



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