REFLECTOR: updraft cooling

John Dibble aminetech at bluefrog.com
Sat Feb 17 13:40:49 CST 2007


I think the amount of air going past the cylinders will determine the
degree of cooling, so it's a matter of making the NACA or armpit scoop
and ducts big enough for sufficient air.

John

Ron Brown wrote:

> And, the downdraft NACA cooling for some unexplainable reason, runs
> about 40 degrees cooler than the updraft cooling.  Mark Machado
> converted what is now the factory trainer from updraft to downdraft
> and says the heads ran 30-40 degrees cooler.  My 173 Elite RG runs
> 360-370 max on a long climb out and 320-340 degrees during a 2600
> rpm/155 kt cruise.  I highly recommend the NACA cooling system.
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