Conrad C.III

Conrad C.III
C III NAG
Type	Inline engine
National origin	Germany
Manufacturer	Nationale Automobil Gesellschaft
First run	ca. 1916
Major applications	DFW C.V

The Conrad C.III was a six-cylinder, water-cooled inline aircraft engine designed by Robert Conrad. It was used on some German training aircraft during World War I. The engine was mainly produced under license by the German Nationale Automobil Gesellschaft.

After having designed two aircraft engines for the German Kaiserpreis aero-engine competition of 1912–1913, Robert Conrad prepared an 180 hp (134 kW) six-cylinder aircraft engine for the second Kaiserpreis competition anticipated to take place in 1914–1915. Further improvements on the engine design were done in 1915 by Robert Conrad while he was working for the Deutsche Motorenbau-Gesellschaft. His work resulted in a six-cylinder water-cooled engine with increased bore which was capable of delivering 185 hp (138 kW) at 1400 rpm. After a successful type test in February 1916, the engine was assigned the designation C.III (C for Conrad) by the German military.

Due to insufficient production capacity at the Deutsche Motorenbau-Gesellschaft, the engine was produced by the Nationale Automobil Gesellschaft (NAG).

After NAG subsequently adapted the engine, it was uprated to 210 hp (157 kW) and successfully type tested in November 1916. The new 210 hp variant however proved unreliable and so subsequent versions of the engine were again rated 185 hp (138 kW), although with various design improvements over the original C.III.

All engine variants were built by NAG. Despite various adaptions of the original design all variants had the same bore and stroke.

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