One hundred fifty more CR.32 fighters were realized as the CR.32ter in 1937 and these carried just 2 x 12.7mm heavy machine guns but were given improved cockpit panels and aiming devices. The CR.32quater (based on the CR.32ter) numbered 337 production units for the Italian Air Force but was also sold to Paraguay and Guatemala. This version was also produced locally by Spain from 1940 until 1943 and forty were reworked as two-seat training platforms. Its major change was a new lightweight design and now a communications set had been added.
The CR.33 made up three prototypes with Fiat AC.33RC engines. Maximum speed was improved to 256 miles per hour but the model was not adopted for serial production.
The CR.40 was a one-off prototype with a British Bristol Mercury IV air-cooled radial piston engine. Like-wise the CR.40bis was a single prototype and the CR.41 followed suit - neither were adopted.
Total CR.32 fighter production reached 1,052 units before its end was seen. It was more or less made obsolete by modern inventions by the time of World War 2 in 1939 but Italian authorities were still convinced of the merits of the CR.32 even against more modern types and the biplane went on to represent over half of the fighter stock available to the Italians as war broke out. As such, these aging biplanes were encountered in the North African campaign and across Italian homeland airspace during the early part of the conflict - certainly into 1940 by which point the fighter was still having a good showing, even against more modern thoroughbreds.
Additional combat actions were seen over Greece but, by 1942, the line was all but marked for retirement. Night time missions were the last taken on by the line. The Spanish Air Force did not retire their lot until 1953.
Other global operators beyond those mentioned included Austria, China, and Nazi Germany. The Austrians committed to 45 of the CR.32bis model while the Chinese fielded the type under the Nationalist Air Force banner. German examples were taken over from the existing Austrian stock.
The Fiat CR.42 biplane fighter (detailed elsewhere on this site) of 1939 was born from this same design.
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