This causes an impact pressure build up on the obstructions
which in turn reduces the flow through the rad. If you want
your
airplane to cool make absolutely sure the back of the rad is
totally unobstructed.

Paul Lamar

I for one am very grateful for your advice. Your comments when I finally recieved the graphs on CDI were very revealing.
 With reguards to Bernie Kerr's RV-9, couldn't he tip the radiator the opposite direction and use a cheek exit? You published a great photo of the truck underhood exit! I have seen many bikes using side exit radiators with great success. I'm not sure how much drag would be added using this method. It is true that this side exit is just a 90 degree rotation of the bottom exit with louvers. Keep hammering away. Ignorance IS cureable. Bill Jepson

Yes I think it would be much better. The duct could shield it from the
radiant heat of the exhaust. Also putting it on the cold side of the engine
would also help.

Paul Lamar
 
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