Graham,
>
> the duct needs to be properly designed for efficient, low drag cooling
> too.
I sure do agree.
You'll find some details on how I designed our radiator duct :
http://contrails.free.fr/tunnel_en.php
No cooling air leaks whatsoever. In flight we can adjust the temps
within 5 C of the target temperature we choose.
Having an efficient inlet diffuser gives us plenty of high pressure 70C
air behind the radiators.
> Several XS builders did redesign the duct with noteworthy results. Bob
> Berube might enlighten us if he's still listening?
> Graham
>
Best regards,
Gilles
http://contrails.free.fr
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