I wrote:

and XN923 wrote:

…..which made me realise I had not made myself clear:-) The P47G was not a later version/improvement on the D. It was an early-model, Razorback D (a D-10 to be precise) built by Curtiss rather than Republic.(in the same way that the difference between a P51B and a P51C is simply one of where it was built). The P47 was undoubtedly improved over time with the later, Republic-built, bubbletop D-25, -27, -30 etc. However Curtiss production of P47s was terminated before the various “improvements” came on line and there is no “P47G” (i.e. Curtiss-built) equivalent of these models.

NiallC

My bad. I assumed (without checking) that the G was a later model on a direct line of continuation from the D – Closter’s comments are therefore no doubt about early and later ‘D’ models.