[Panzergranate]

I can remember a James Cagney Film where he was a pilot testing these de-icing boots out.

I kind of forgotten what the film was called.

The thing is that a surface only has to be warmed to 1 Celsius to stop ice forming.

Wind chill is scientifically regarded as being -1 Celsius per 12 MPH of airspeed. So at 120 MPH, the wind chill factor will be an additional -10 Celsius below the noraml air temperature.

Therefore, as bombers became faster and could fly higher, icing became growing problem.

The PC based "Red Baron" simulator series, by Sierra, had icing effects including carb icing as there was an option to turn icing effects off.