Purzel,
Sorry to have abandoned you last night, but I was in the middle of a furball and then had to run over the TA.
I fly LW iron but, Young Ash is the P47 man of the house and I will have him contact you.
What little I know about the P47 series I learned from a posting of an URL from Westy. Maybe he can post it here again :-).
My understandings of the 47 series are as follows: Speed: D30 is faster, Stability: D25 is less stable and wants to stall much sooner than the D30 <no Dive flaps on the 25>, Energy Retention: D30 excells here {all 109 pilots think it's overmodeled :-)}. Get the D30 fast and you can "Zoom to the MOON",and both models are tough as nails, and those 8 50 cals can put a real hurt on any plane. I think the D25 was introduced to have an earlier modeled Jug for Scenerios < hope! > and to round out the later war plane set.
Best of Luck Pruzel,
Horrido!
Old Ash
III./JG2