The Fokker V.9 was part of a series of experimental aircraft which led up to the low-production D.VI

Fokker D.VI

-Bibliography:* Gray, Peter and Owen Thetford. German Aircraft of the First World War. London: Putnam, 1962. ISBN 0-93385-271-1* Taylor, Michael J. H. Jane's Encyclopedia of Aviation. London: Crescent Books, 1993. ISBN 0-51710-316-8....

 fighter. The aircraft were very similar, varying in detail and power plants.

The V.9 was powered by a 60 kW (80 hp) Oberursel

Motorenfabrik Oberursel

Motorenfabrik Oberursel A.G. was a German manufacturer of automobile, locomotive and aircraft engines situated in Oberursel , near Frankfurt , Germany. During World War I it supplied a major 100 hp-class rotary engine that was used in a number of early-war fighter aircraft designs...

 and first flew in December 1917; all others flew in 1918.

The V.12 was powered by an experimental 119 kW (160 hp), Steyr

Steyr-Daimler-Puch

Steyr-Daimler-Puch was a large manufacturing conglomerate based in Steyr, Austria, which was broken up in stages between 1987 and 2001. The component parts and operations continued to exist under separate ownership and new names.-History:...

-Le Rhône

Le Rhône

Le Rhône was the name given to a series of popular rotary aircraft engines produced in France by Société des Moteurs Le Rhône and the successor company of Gnome et Rhône. They powered a number of military aircraft types of the First World War...

engine.

The V.14. Like the V.12, the V.14 was powered by the 119 kW (160 hp) Steyr-Le Rhone.

The V.16 was powered by the 81 kW (110 hp) Oberursel Ur. II.

V.33 was a development of the V.9. It was tested with both 82 kW (110 hp) and 108 kW (145 hp) Oberursel engines.