Oberursel U.I

1910s German piston aircraft engine

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 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

Specifications

General characteristics

• Type: 9-cylinder counter rotary engine
• Bore: 124 mm (4.9 in)
• Stroke: 150 mm (5.9 in)
• Displacement: 16.3 L (990 cu in)
• Length: 45 in (1,150 mm)
• Diameter: 40 in (1,020 mm)
• Dry weight: 139.7 kg (308 lb)

Performance

• Power output: 73.6 kW (98.7 hp) até 1.200 rpm
• Compression ratio: 3.7:1

References

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