Here is very nicely done P51 type system on a Velocity Buick V6 that showed
up at OSH about four or five years ago. The problem with this system
was the the rad was too thick... of necessity to get the needed rad volume.
Note the rather large increase in overall frontal area due to the wide
thick rad. 

The frontal area of the simple & cheap cooling system would be no
more than the scoop opening area shown here. The boundary layer bypass,
if it was used, would merely be a gap between the rad and
the bottom of the fuselage.

I cannot tell you what the interior duct shape was as I was unaware of K&M's 
experimental work at that time so I paid no attention to the interior shape.

The owner was complaining it about it not cooling on climb out
as I recall.

Paul Lamar
 
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