Ice Intercooler

[Elon Ormsby <ormsby1@llnl.gov>]

Skip Higginbotham said (snip). . .  emergency landing due to broken carb 
heat linkage and one on which the jury is still out......wasn't cold 
outside....about 90 degrees.

A high OAT has very little to do with the potential for carb icing.  The 
dew point is far more important.  At 100 degrees f a dew point of 50-70 deg 
f will cause icing (with a relative humidity of only 20-40%).  Sounds like 
your 90 degree day had a high dew point,  a perfect recipe for 
icing.   Remember, there is not only an endothermic phase-change taking 
place with the gas but the water vapor phase-change (into condensation, 
necessary for ice to form) is also endothermic.  The combination of the two 
(and the manifold pressure drop) can lower the temp at the carb venturi to 
below zero f!!  -Elon

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