Le Rhone C-9 Rotary Engine 

Le Rhone C-9J
Date of Manufacture: 1915
Country: France
Horespower: 80
Cylinders: 9
Diameter: 960 mm
Depth: 890 mm
Weight: 130 Kg (dry)
Aircraft Example: Nieuport 17

The Le Rhone C-9 was a French air-cooled rotary engine rated at 80 hp. It was installed in combat airplanes early in WWI, but as larger and more powerful engines were developed, it was gradually relegated to training-type airplanes.

Le Rhone engines were quite dependable and by the end of the war, were being manufactured in England, Italy, and the U.S. in addition to France. In fact, the German-produced 110-hp Oberursel was practically and exact copy of the 110-hp LeRhone.