This guy obviously disagrees with Jeff about where to
pick up the air. Data in Fluid Dynamic Drag tends to 
confirm it is better to get the air away from the prop
blast. For the complete story see the link on the RE News 
Letter web site. PL

Cooling Systems 

 For Automotive Conversions

 By: Hans Mayer RAA #0513 (Midland Ontario Chapter)


RULE NO. 1 for our cooling system is, exhaust the heated air at the same
level,
           or preferably higher, than the intake area.

RULE NO. 2 have your intake area in a high pressure zone on the aircraft
and in
           undisturbed flow. Exhaust the heated air in a low pressure
zone or in
           a turbulent flow area. That is very easy to do right? Think
again!

The propeller blast, you'll say, gives us high pressure and lots of
flow. That is correct, but the propeller also gives us turbulent flow
and pulses if we come too close to it. So, where is the clean flow and
high pressure on the aircraft? 

Simple, on the wing! The wing and the areas under the wing have the most
undisturbed and clean flow of the whole aircraft. That is the area where
we
should pick up the cooling air. The radiator and the exhaust area can be
in the fuselage. 
 

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