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The OX-5 was one of the early aircraft engines that did more than most in bringing aviation through its pioneering days to a more common and accepted place in everyday life. Built by the Curtiss company for both military and civilian aircraft from 1913 to 1918, the OX-5 was used by several aircraft that saw action in the First World War, including the famous JN-4 "Jenny.

The OX-5 produced 90 hp (67 kW) at 1400 RPM, and just over 12,600 were built.

There is a group of OX-5 enthusiasts and aging barnstormers known as the OX-5 Aviation Pioneers. Their motto is "Aviation History by those Who Lived It".