I found this formula:

http://williams.best.vwh.net/avform.htm#Mach

Which shows a temp rise pretty close to what the MU-2 flight manual shows.

Mike
MU-2


"vlado" wrote in message
ups.com...
Is there a rule of thumb for 'speed of heat'? Meaning the speed in
knots where ice will not form on the leading edges of a wing. For
example, the Saberliner had no de-ice or anti-ice system, just speeding
up would remove or prevent ice build up.
Thanks.