US Fighter Dive Test By British Test Pilot Eric Brown

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To Clarify, the NACA report testing maneuverability up to Mach 0.76 was P-47B model. NOT an N model as some guy in the comments keeps saying.

The RAF Air Fighting development unit, which tested up to .83 (450mph at 20,000) was a P-47C as was the plane Eric Brown tested. They may have even been the same exact airplane.

The large scale model NACA used which was shown in this video was a P-47D Razorback, so a D-22 or earlier. Most of the NACA testing of the Thunderbolt was with a D model. The M model was also tested as was the N. The M is functionally the same as a D in terms of Mach limits and the N is actually slightly lower down at 10,000 feet.

All P-47s except the N model have a 500mph IAS limit at 10,000 feet. Converted to calibrated it's at least 513 which works out to a Mach number of 0.795. At 20,000 feet it's limited to 413 CAS which gives 0.771. I used 0.775 in the manual as an average. It's actually about exactly what you get if you go off of IAS at 10,000 feet.

Feel free to put the numbers in yourself: https://aerotoolbox.com/airspeed-conv... again 513 CAS at 10,000 feet and 413 CAS at 20,000.