George Lendich wrote:

Paul,
Just being the devil's advocate here mate, but by sloping the
radiator and using the baffles suggested ( longer, angled, wider
spaced), aren't we creating a thicker radiator in terms of the
direction of the longer baffles.

Yep. That is certainly true. It will be interesting to see if it
 really reduces the drag.

Now if thickness is not a problem with the wider spacing, why not
eliminate a lot of drag by mounting it flat to the underside
and have angled (wedge shaped) baffles do all the work. After
all isn't the wedge shape merely to generate (equal) pressure
through the rad (more pressure, more density, more heat transfer).
A simple small flap at the back end could control flow.

To follow this concept to it's logical conclusion ( if  appropriate)
brings a whole new dimension to cooling.

George (down under)

I am not sure I know what you have in mind.

IMHO the key to making it work is having a perpendicular scoop opening of
some sort. If the air can easily go around the scoop opening
and if there is any significant pressure in the duct the air WILL go

around.

That is the main problem with the NACA duct.

The magnitude of the mass of the air actually entering the scoop
opening is what is important.

Paul Lamar

Paul,
Didn't think of that, could be a problem, however nothing ventured nothing
gained, at least were all thinking along the same track.
George (down under)

 
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