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Early Spitfires could do about 320 mph, they were powered by Merlin engines which then were about 950 hp. The Merlin, and the Spitfire were in constant development throughout WW2 and by 1946, versions of the Spitfire were flying at over 460 mph with almost 2,200 hp from the Griffon engine (an improvement of the Merlin.)

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12y ago

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