Fokker S.I

The Fokker S.I was a Dutch primary trainer, first flown in 1919 and the first of a family of trainers from Fokker. Reinhold Platz designed it with a cantilever parasol wing and two side-by-side seats for instructor and pupil in a wide cockpit, and it first flew in early 1919 at Schwerin. Although the prototype performed well, the unusual cantilever parasol wing was not liked and only three production aircraft were built. Two of them, with 60 kW Le Rhone engines, were exported to the USSR, and one more was built for the United States Army Air Service for evaluation at McCook Field, where it was powered by a 67 kW Curtiss OX-5 engine and designated the TW-4, meaning Trainer Water-cooled. The TW-4 had a wingspan of 12.71 m, a gross weight of 893 kg and a maximum speed of 138 km/h.