CubCrafters introduced two new models of the two-place, high-wing, single-engine aircraft based on Piper’s 80-year-old design and both share increases in payload, range, speed, and utility. The Carbon Cub EX–3 is an experimental amateur-built kit while the FX–3 is a factory builder-assisted version.
Source: aopaCubCrafters introduces Carbon Cub EX–3, FX–3