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.
