"Barnyard BOb -" wrote in message This type of system won't meet the
needs of an icing Lear Jet at 50,000 feet,

Lear's system doesn't meet the needs of a Lear, hence the bath towel in
every -20 and -30 series cockpit.

or aircraft that have no need of high wattage termistor
designs operating @ - 40 degrees F and .8 mach.

I seem to recall some sort of temperature control on the acrylic windshield
of the Cessna 414. I can't confirm it right now because my reference
material is stored in a mandatory curfew area.

D. (still better than shoveling snow)