'Wind Chill' is completely irrelevant. It is only meaningful when discussing an object (usually the human body) which is significantly warmer than the air temperature. Apart from any engine heat, and anything done to deliberately heat the wings, their temperature will be pretty much the same as the outside air temperature. The only way airspeed can make a difference is when there are friction effects in the transonic/supersonic range: not really significant in IL-2.
If the film mentioned 'wind chill' as affecting ice formation, it is just plain wrong.
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