The SNCASE SE.580 was a prototype fighter designed during World War II by the French aircraft company SNCASE (). Loosely based on the pre-war Dewoitine D.520, it was intended to be powered by a Hispano-Suiza 24Z piston engine. Production began on a single prototype, but the program was cancelled before it was completed. History In 1940, SNCAM began studies of a new fighter aircraft, based on the pre-war Dewoitine D.520, designated M.580. Originally, the power plant was two Hispano-Suiza 12Z engines coupled in tandem and driving a coaxial contra-rotating propeller (similar to the Arsenal VB 10). Before much design work was completed, SNCAM was absorbed into SNCASE (often referred to as Sud-Est) in late 1940, with the aircraft being redesignated SE.580.

Specifications (Planned; 1943 version)

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