The CAP-4 was originally developed by Empresa Aeronáutica Ypiranga as an unlicensed copy of the Taylor Cub powered by a Salmson 9Ad radial engine.

It featured a high strut-braced wing, two enclosed tandem seats, and a steel-tube fuselage with fabric covering.

The type was widely successful, with nearly 800 units being produced for Brazil's flying clubs and armed forces, as well as for export to Argentina, Paraguay, Chile, Uruguay and Portugal.

In 1956, Sociedade Aeronáutica Neiva acquired the rights renaming it to P-56 Paulistinha, the design was used as the basis for an agricultural aircraft, the P-56 Agricola, adding a fibreglass chemical hopper and spraybars, but this was unable to compete with imported, purpose-built agricultural aircraft.

Data from Jane's Fighting Aircraft of World War II [2]General characteristics Performance