Short description:

Motorenfabrik Oberursel A.G. was making a variety of types of rotary engine.
The most successful of them was the Oberursel UR II, which was really a copy of the French Le Rhone 9J. The most famous airplane of the Great War, the Fokker Dr.I, had this very engine; and it was with no small thanks to the UR.II that the Dr.I displayed a dogfighting ability to match the airplanes of the enemy.

About a prototype:
Type Air-cooled rotary engine Cylinders 9 Displacement 16,3L Bore 124mm Stroke 150mm Dry weight 150kg Power output 82kW R.P.M. 1200
Materials:
Plexiglas - 1, 1,5 мм. polyvinylchloride - 0,3 мм.
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