Republic made several attempts to further improve the P-47D: Two XP-47Hs were converted They were major reworkings of existing razorback P-47Ds to accommodate a Chrysler IV-2220-11 water-cooled 16-cylinder inverted vee engine. The plane reached 490 mph in level flight, but, with the end of the war, it never saw production.
This is a very old build of mine. It was built from a very bad MPM kit.