Originally posted by chunder
P-47D-15-RE (AC42-75859)... P-47J lookalike.
A little background...
This photo was passed to Warren Bodie by Ed Boss Jr. of the Cradle of Aviation Museum, which obtained much of Republic's photo archive after Fairchild-Republic went "belly-up".
This aircraft is, as Chunder points out, a modified P-47D-15-RE. It was used as a powerplant testbed for the engine, systems and cowling (with a FW 190 type cooling fan) destined for the XP-47J airframe, which was still being constructed at the time.
However, this was not the first Thunderbolt to be fitted with the high output C series engine. A modified P-47C was fitted with the engine in early 1943, and eventually provided baseline test data later used to develop the P-47M and N.
My regards,
Widewing