Kweassa - Eagl has alread covered much of the reason for the P47 zoom ability. In addition to that is the paddle prop, to which there are multiple references in Gabreski's book. I don't think this prop was used on earlier P47s (?) but he really swooned about it on the P47D. I think it was he who said that this prop would give him an extra 1000ft of zoom, and he could really hang the aircraft on it. I can check this out, but I don't have time to do it today - sorry.