Oberursel U.I

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

Gnome Monosoupape 9N p1040425.jpg
A Gnome 9 Delta, from which the U.I was copied, on display at the Musée des Arts et Métiers, Paris
Type 9-cyl Rotary piston engine
National origin Germany
Manufacturer Motorenfabrik Oberursel
Developed from Gnome Delta



  1. ^ Kyrill von Gersdorff, Kurt Grasmann. Flugmotoren und Strahltriebwerke, Bernard & Graefe Verlag, 1981, ISBN 3-7637-5272-2