On Fri. 04 Aug 1944 An extensively modified Thunderbolt fighter (XP-47.....

An extensively modified Thunderbolt fighter (XP-47J) became the first airscrew driven aircraft to exceed 500 mph in level flight with a recorded speed of 504 mph. However the P-47J did not go into production as the Republic development team chose to concentrate on the more advanced XP-72 project

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