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Curtiss OX-5

DAYTON, Ohio -- Curtiss OX-5 engine on display in the Early Years Gallery at the National Museum of the United States Air Force. (U.S. Air Force photo)

DAYTON, Ohio -- Curtiss OX-5 engine on display in the Early Years Gallery at the National Museum of the United States Air Force. (U.S. Air Force photo)

Thousands of OX-5 water-cooled engines were produced in the United States during World War I, primarily for the Curtiss Jenny airplane. The engine, a refinement of a 1914 design, was rated at only 90 hp. Compared to other airplane engines of the period, it was very reliable. Some OX-5 engines are still being used in restored Jenny airplanes throughout the nation.

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