In IL2, if you have your automatic prop pitch enabled, then it will automatically keep your engines RPM's at, or lower than their constant speed value, if you disable automatic prop pitch, all it does is make the prop pitch control up to you, so if your not constantly changing your prop pitch as you accelerate/decelerate to keep it in your engines power band than you'll either fry your engine or not get full power out of it, its that simple.
as for planes with variable prop pitch that you can't adjust, either you couldn't in the real plane, or they just never bothered to put it into il2
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