Dewoitine D.520

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The Dewoitine D.520 was a French single‑seat fighter introduced at the start of World War II. Built to be fast, agile, and armed with a 20 mm cannon, it was France’s answer to modern aerial combat and one of the few contemporaries that could rival early German fighters.

Development and design
- Origin and goal: In 1936 France called for a fast, modern fighter with strong climbing ability and a heavy cannon armament. Dewoitine’s design, later named the D.520, started in 1936 and aimed to reach speeds around 500+ km/h.
- Engines and performance: Production aircraft used the Hispano‑Suiza 12Y family of engines. Early versions were underpowered compared with late 1930s rivals, but improvements brought the D.520 to about 530–550 km/h in later models. It could climb to high altitude quickly and had a respectable diving speed.
- Armament and build: The standard weaponry was a 20 mm HS.404 cannon firing through the propeller hub, plus four 7.5 mm MAC 1934 machine guns in the wings. The design emphasized ease of maintenance, quick reloading of ammunition, and good pilot visibility from a cockpit placed well behind the nose.

Production and development timeline
- Prototypes and testing: The first prototype flew in October 1938. Early tests revealed cooling and drag issues, which were addressed by radiator redesigns and aerodynamics tweaks. By 1939 the aircraft was demonstrating its intended speed.
- Production contracts: With the war looming, production was ramped up. Orders eventually reached the hundreds per month, but the German invasion and armistice of 1940 cut deliveries. Overall, hundreds of D.520s were produced before and during the early war years, with additional production and modifications proceeding under the Vichy regime and in allied collaborations later on.
- Post-armistice and adaptations: After France’s 1940 armistice, D.520s remained in service with the Vichy French Air Force, the Free French, and were even produced again in limited numbers. Some remained in North Africa, were shipped to allies, or captured and used by others, including Italy and Bulgaria.

Operational history
- Battle of France: The D.520 saw action against the Luftwaffe in 1940. It was praised for its maneuverability, though its impact was limited by numbers. In combat trials it showed that it could hold its own against contemporary foes in dogfights, though the early models were slower than the best German rivals.
- Post‑armistice service: Under Vichy control, the D.520 gained a second life, serving in North Africa and the Levant. Several were flown to Syria–Lebanon in 1941–1942 to fight Allied air forces. Some were later used by the Italian and Bulgarian air forces, and a few were tested by the Germans for training purposes.
- By the end of the war: D.520s were increasingly used as trainers and for secondary roles as newer fighters took over frontline duties. The fighting era of the D.520 ended in 1953, when the last examples were withdrawn from service.

Notable operators and usage
- Primary user: France (both the pre‑armistice French Air Force and the Vichy regime), with Free French forces later reengaging in combat.
- Other operators: Italy’s Regia Aeronautica used captured D.520s; Bulgaria and Germany also employed them in various roles, including training. A handful found their way to North Africa and the Middle East during the war.

Legacy and summary
- The D.520 was one of France’s most capable fighters at the outbreak of World War II, offering good handling, a potent 20 mm cannon, and solid all‑around performance for its time. While production was hampered by political and military upheaval, the D.520 made a meaningful contribution in the early war years and left a mark as a capable, modern French fighter of its era.