Curtiss OX

Continuing to improve his early aircraft engines, Glenn Curtiss introduced his Model O in 1912 (per OX-5 Aviation Pioneers).
In 1913, an improved O called the OX was introduced. The OX powered the U.S. JN-4 Jenny and the British DH 6. The availability of the OX at surplus prices made it the engine of choice for many postwar aircraft.

Over 8,000 OX engines were produced.


  • O: 75 hp (56 kW)
  • OX: 90 hp (67 kW)


  • Eight cylinders, water-cooled, vee
  • 503 cubic inches (8.2 litres)

used by

  • Curtiss Model D