The PA-20 Pacer and PA-22 Tri-Pacer, Caribbean, and Colt are an American family of light strut-braced high-wing monoplane aircraft built by Piper Aircraft from 1949 to 1964. The Pacer is essentially a four-place version of the two-place PA-17 Vagabond, with conventional landing gear, a steel tube fuselage and an aluminum frame wing covered with fabric, much like Piper's famous Cub and Super Cub. The Tri-Pacer is a development of the Pacer with tricycle landing gear, while the Colt is a two-seat flight training version of the Tri-Pacer. Prized for their ruggedness, spacious cabins, and, for the time, impressive speed, many of these aircraft continue to fly today. Factory installed , , , , and engine options were available, and engine after-market conversions have been offered. Development The Pacer and the Tri-Pacer were the first post-World War II Piper designs with flaps and a control yoke instead of a center stick, and they belong to a sub-group of Piper aircraft popularly called "short wing Pipers," reflecting their shorter wingspans compared to the earlier J-3 Cub and PA-18 Super Cub. The PA-20 Pacer is a tailwheel aircraft and thus has somewhat limited forward visibility on the ground and relatively demanding ground-handling characteristics. To help introduce more pilots to easier, safer flying, from February 1951, Piper introduced the PA-22 Tri-Pacer with a nosewheel instead of the tailwheel landing gear. Additionally, the Tri-Pacer offered higher-powered engine options in the form of and engines, whereas the largest engine available to the original Pacer had an output of . At the time the tricycle undercarriage became a popular preference and 1953 saw the PA-22 Tri-Pacer outsell the Pacer by a ratio of six to one. Due to the geometry of the nosewheel installation, the aircraft is sometimes called the "Flying Milk Stool." In 1959 and 1960 Piper offered a cheaper, less well-equipped version of the Tri-Pacer with a Lycoming O-320 designated the PA-22-150 Caribbean. Over 9400 Tri-Pacers were produced between 1950 and 1964 when production ended, with 3280 still registered with the U.S. Federal Aviation Administration (FAA) in April 2018. An unusual feature of the Tri-Pacer is bungees linking the ailerons and rudder to facilitate coordinated flight. The system can be easily overcome by the pilot as needed and allowed the installation of a simple autopilot marketed by Piper under the name Auto-control. A trainer version of the PA-22 Tri-Pacer, the PA-22-108 Colt, was introduced to