EAY had built five examples by the time that the firm was purchased by Companhia Aeronáutica Paulista in 1942. CAP continued manufacturing the type under the designation CAP-4.
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. At the time of peak production in 1943, a new CAP-4 left the factory every day, and production continued until 1948.
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.
Variants
EAY-201
original radial engined version
CAP-4
main production version
CAP-4B
air ambulance version (2 prototypes built)
CAP-4C
artillery-spotting version, (Paulistinha Rádio or Paulistinha Observação)
P-56 Agricola
agricultural version by Neiva (60 built)
Paulistinha 56-C
Powered by 90 horsepower (67 kW) Continental C-90-8F/12F engine. 256 built by Neiva between 1958 and 1964.[1]
P56C-1 Paulistinha Rebocador
Paulistinha 56-D
More powerful version with 150 horsepower (110 kW) Lycoming O-320-A1A. Single prototype built, which was designated L-6A by Brazilian Air Force. No production.[1]
Bridgman, Leonard (1998) [1946 (Reproduction of 1945/46 Jane's All The World's Aircraft)]. Jane's Fighting Aircraft of World War II. Twickenham, UK: Tiger Books. ISBN1-85501-994-9.
