Oberursel U.I

U.I
Type9-cyl Rotary piston engine
National originGermany
ManufacturerMotorenfabrik Oberursel
Developed fromGnome Delta

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 Delta that Oberursel was producing under licence before the war. It produced 75 kW (100 hp).