The PA-22 was identical to the PA-20 Pacer except for the
tricycle landing gear. However,
far more of the former were built,
since tail draggers tended to be out of fashion in the mid-50s.
Ironically, a number
of Tri-Pacers have been converted to Pacers, and a kit to do so is now
example above is an early PA-22-150 and is seen at Hawthorne Municipal
1961. Below is Piper Aircraft Company post card
advertising the 1953 Tri-Pacer.