The Oberursel U.I was an early German aircraft engine that powered many German fighter aircraft in the first part of World War I. It was a 9-cylinder air-cooled rotary engine, a licence-built copy of the Gnome DeltaKyrill von Gersdorff, Kurt Grasmann. Flugmotoren und Strahltriebwerke, Bernard & Graefe Verlag, 1981, that Oberursel was producing under licence before the war. It produced 75 kW (100 hp).
Applications AGO DV.3 Euler D.I Euler D.II Feiro Dongó Fokker D.II Fokker D.V Fokker E.II Fokker E.III Gotha LD 5 Pfalz A.II Pfalz E.II Pfalz E.III Pfalz E.VI Siemens-Schuckert E.III
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