New England Air Museum
Curtiss OX-5


Gift of George S. Pranaitis


An outstanding American engine of the World War I era, the OX-5 powered the Curtiss JN-4 "Jenny" trainer. It is a liquid-cooled V-8 and was the first US-designed engine to enter mass production with approximately 12,600 units built. Its service continued through succeeding years as surplus aircraft were purchased by barnstormers and private owners. It also helped foster the private aviation industry by powering the WACO Travel Air and other new aircraft into the early 1930's.

Its separate cylinder type of construction gave it a higher power-to-weight ratio compared to then state-of-the-art automotive engines.

This license-built example was manufactured in 1917 by Willys-Morrow in Elmira, NY.

The engine is located in the connector between the Military and Civilian Hangars.

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Type: 8-cylinder, liquid-cooled, "V" piston engine
Valvetrain: One intake and one exhaust valve per cylinder, pushrod-actuated
Displacement: 503 cu. in.
Dry Weight: 390 lbs.
Power Output: 90 hp at 1,400 rpm (max power)
Compression Ratio: 4.9:1
Power/Weight Ratio: 0.27 hp/lb
NEAM Id: 17


Engine Collection Index