At what speed and altitude? Compare the whole Ps graphs.
Consider the drag as size and coefficient, P-51 is bigger.
Where is the supercharger working best compared to the alt?
The speed of the plane has much to do with the optimal blade angle but mostly...
When you command more prop rpm than the plane has power to support, the prop will flatten a bit and you'll lose some thrust.
Most IL2 planes have some form of pilot-controlled CSP and some are even more automated though there are pre and early war models that don't have CSP all the way down to fixed props.
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