On Tue, 27 Jan 2004 20:33:12 -0500, Roy Smith wrote:


When a gas undergoes adiabatic expansion, it gets cooler. There is no
doubt that this happens at the leading edges of airfoils, but at the
pressure drops we're talking about in any kind of airplane I'm likely to
fly is very small. How small is very small? I'm not sure, but I can't
imagine more than a degree or two.

That is all we are discussing, whether the FAA +5 to -20 is a
reasonable range for icing.