Carburettor heat in Spits and Hurri

[Blackdog_kt]

Someone posted there could be another reason apart from carbs and it's not a far stretch: propeller icing.

This can create vibrations and RPM fluctuations (especially if the ice distribution is uneven) and maybe puts a strain on the engine via the transmission.

I don't know how correctly or not its modeled or if its modeled in the first place, but it's plausible. There are general aviation aircraft that feature heated propellers for these reasons, but i don't know if any of our WWII warbirds had such systems and how CoD models the whole thing.