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It has been proposed that a heat exchanger would provide sufficient cooling
for the Walters Turbine in a Lancair IV.  Fuel, (kerosene) would be pumped
through as the coolant, then various amounts of the warmed fuel consumed in
combustion and the rest returned to the wing tanks.  This prewarming would
add to the efficiency of the turbine and additional efficiency would be
realized from the absence of drag using air inlet system to provide cooling
air.  My question is how much heat could be transferred to the air over the
wing.  There are approximately 200 square feet of wing surface area when the
tanks are full.  The wing construction has the insulator of the honeycomb,
but if some heat could be transferred from the wing to the air over the wing
then not only would this system appear to have merit, it would provide for
deicing as well.  

Walters 601D Lancair IV (nonP) now sitting on its gear.
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