History of War - - OPERATOR’S HANDBOOK -

The early Fokker Ein­decker, des­ig­nated E.I, mounted the seven-cylin­der, 80-horse­power Oberursel U.0 ro­tary petrol en­gine, a li­cense-built copy of the Frenchde­signed Gnome Lambda or Delta ro­tary en­gines that the fledg­ling Ger­man air­craft in­dus­try had been pro­duc­ing be­fore the out­break of World War I. The later E.II and E.III Ein­deck­ers were pow­ered by the Oberursel U.1 nine-cylin­der, 100-horse­power ro­tary en­gine, while the E.IV was fit­ted with the 14-cylin­der Oberursel U.III.

The en­gines were air-cooled and reliable. How­ever, although the plane was light, it could achieve a max­i­mum speed of only 140 kilo­me­tres per hour (87 miles per hour) with the larger pow­er­plant.

This view re­veals the con­fig­u­ra­tion of the 100-horse­power Oberursel U.1 nine-cylin­der ra­dial en­gine. The ra­dial en­gine was both praised and crit­i­cised in ser­vice for Ger­many

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