 When Piper dropped the J- designation system in exchange for the PA- system, the J-5C became the PA-12 "Super Cruiser".The earlier J-5s had been powered by either a Lycoming O-235 or a Lycoming O-145.The newer PA-12 model was initially powered by a Lycoming O-235-C engine, was fully cowled, and had a metal spar wing with two 19 gallon fuel tanks.