Originally posted by wells:
XP-72, with R-4360-13 28 cylinder Wasp Major?
No wait...I found it. It's a D-15-RE used to test the powerplant installation for what was to become the XP-47J, on pg 223 of Bodie's Thunderbolt book.
That is exactly correct. This aircraft, AAF serial number 42-75859 ramained at Republic's Farmingdale being used a test mule until mid 1944, where it disappears from inventory.
Prior to building the XP-47J, Republic tested their engine installation on this aircraft, which was simply taken from the production line per contract #W535-AC-39160, which authorized Republic to retain the aircraft. The photograph was obtained via the Cradle of Aviation Museum, who have a copy in their archives. Ed Boss donated the photo to the Museum and gave a copy to Warren Bodie. In exchange for doing some writing for the Museum, I have been allowed access to their photo archive, which is extensive.
My regards,
Widewing