Fiat CR.1

Fiat
Industry	Automotive and aerospace
Founded	1899
Founder	Giovanni Agnelli
Headquarters	Turin, Italy

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The Fiat CR.1 was a biplane fighter developed in Italy during the 1920s. Constructed primarily from wood and fabric, it was the creation of Celestino Rosatelli, from whose initials the 'CR' code originated. A notable design characteristic was its lower wingspan, which exceeded that of the upper wings.

Design and development

Template:More citations needed section In the early 1920s, the Regia Aeronautica commissioned Fiat to produce two prototype aircraft. These prototypes, labeled MM.1 and MM.2, were nearly identical except for variations in their rudder design—one featured a rounded, counterbalanced rudder—and differences in their Hispano-Suiza piston engines.

The CR.1 followed a traditional biplane configuration, equipped with fixed tailskid landing gear and an open cockpit positioned so that the pilot's head aligned with the rear edge of the upper wing. Powered by a V8 engine, it drove a fixed-pitch, two-bladed wooden propeller. The landing gear included a rigid axle connecting the wheels. Armament comprised two synchronized 7.7 mm (.303 in) Vickers machine guns firing through the propeller arc.

When tested alongside the SIAI S.52 fighter prototype, these Fiat models demonstrated superior agility and higher maximum speed. Consequently, production contracts were awarded to three Italian manufacturers to produce batches designated as CR.1:

Fiat was tasked with manufacturing 109 units.
OFM of Napoli received an order for 40 units.
SIAI was assigned to build 100 units.

Following flight evaluations of two additional preproduction aircraft, a total of 240 CR.1 fighters entered service with the Italian military starting in 1925.^[1]

Operational history

Template:Unreferenced section The Regia Aeronautica procured 240 CR.1 fighters and began equipping its 1st Fighter Group by 1924. By two years later, twelve Italian fighter squadrons operated this model. In that same year, Fiat launched an improved all-metal successor known as the CR.20.

Although both Belgium and Poland conducted evaluations but ultimately declined to adopt the aircraft, Latvia placed an export order. Their fleet of nine CR.1s, powered by the Hispano-Suiza HS8N8 engine delivering 224 kW (300 hp), served within Latvian Naval Aviation until 1936.

During the 1930s, certain CR.1s were upgraded with more powerful Isotta Fraschini Asso Caccia engines rated at 328 kW (440 hp), enhancing their performance capabilities. These modified planes were assigned to the 163 Squadriglia, stationed on Rhodes in the Aegean Sea. These units were retired from frontline duties by 1937.