Here is my suggestions for improving the outlet duct. London and
Kuchemann & Weber both recommend opening this area up as much as possible.

Paul;

Al Gietzen wrote:

Could be, but what you can't see in the picture is that the thickness of the
wing gets less going out, so at the far end the top corner of the rad is
pretty much against the upper skin.

Al

 That is why you need louvers up there. The back of the rad needs
space to let the air flow out freely. The top of the wing towards the back is
not that low of a pressure area. Most of the low pressure is on the front
top third of the wing. Particularly a canard pusher with no flaps. 

BTW why are you bothering with such a small aux radiator. Why not make
the main one a little bit bigger? Would simplify the plumbing would it
not. Also what are you using for a water pump?

Paul Lamar
 
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