Here is a system on an Extra 400 no less using a Continental
liquid cooled six cylinder Voyager engine.
Same idea. Perpendicular thick rad. Note: there is
no diffuser duct to speak of. An un ducted rad for
all practical purposes.

Walter Extra is normally a very competent aircraft designer.

The pilot told me it was not cooling very well and they
had to change the ratio of ethylene glycol to water 
winter and summer in an attempt to make it cool better.
Nearer pure water in the summer.

This is a very fast airplane and probably climbs out
at 150 MPH where the dynamic pressure is twice what it is
at 100 MPH.

Paul Lamar
 
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