Why did the iconic Spitfire upgrade from eight machine guns to heavier cannons?

Why did Spitfires change their guns? (Ft. Jonathan Ferguson) · 17:40 · Video: Imperial War Museums · Watch at the source

In short: The Spitfire evolved alongside its combat requirements, transitioning from its original eight-gun configuration to more powerful weaponry. Jonathan Ferguson from the Royal Armouries examines this complex and debated history of aircraft armament development.

The early Spitfire Mk 1 relied on eight machine guns firing .303-rifle calibre rounds. As the aircraft underwent development, it received significant upgrades, including more powerful engines and a heavier armament suite to increase its lethality.

This shift involved integrating 20mm cannons and .5-inch machine guns. The history of these changes remains a subject of debate, reflecting the broader, complicated evolution of the Spitfire throughout its service life.

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