These are strictly internal shapes.

They reduce drag as they improve the cooling of a given size rad core.
The outer inlets can be like a P51 scoop, round inlets on the front
of a cowl or a flush NACA duct opening on the bottom or side of the
the airplane.

Bullseye!  You found a way to say it so it makes sense to me Paul.  Thanks
again:-)
Robin

 
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