The Fokker A.I was an "A-class" unarmed two-seat monoplane observation aircraft of the 1914-15 era early in World War I, powered as the earlier Fokker M.5 was, by a 58.8 kW Oberursel U.0 seven cylinde
The Fokker E.II was the second variant of the German Fokker Eindecker single-seat monoplane fighter aircraft of World War I. The E.II was essentially a Fokker E.I with the 75 kW Oberursel U.I 9-cylind
Fokker E.II/35 from Feldflieger Abteilung 14 preparing to land on the Eastern Front.
Max Immelmann's Fokker E.II in late October 1915, showing the initial form of soffit surface that the larger Oberursel U.I nine-cylinder rotary engine and larger diameter cowl required.