Oberursel U.I

U.I
Type 9-cyl Rotary piston engine
National origin Germany
Manufacturer Motorenfabrik Oberursel
Developed from Gnome Monosoupape

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

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