Question: just how much does the dive flaps effect the plane in real life, and how much does it effect in AH2?
I'm by no means experienced in P-47Ds or P-38Ls, but empirically, in case of the P-47D-40 I hardly notice any real difference in handling when dive flaps are turned on.
Being used to Bf109s I'd say I know how 'limited in dive speeds' feel - the P-47D-40 seems to handle very well in pitch response at all speed ranges, and frankly I've never bothered using dive flaps in the D-40.
On the contrary, I can't feel any kind of difference between dive flaps raised or lowered, in the P-38L. If I step over a certain line the plane will refuse to pull up without sufficient trim input.
In IL2/FB, it is very different. When you engage dive flaps in the P-38L the plane would immediately pull up, almost doing a loop by itself. So naturally, in IL2/FB there was a reason to prefer the P-38L over the P-38J. The P-38J locks up at high speeds, and the slight speed penalty was worth it in the P-38L - the dive flaps really made a lot of difference.
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So, just how much is the dive flaps supposed to help?