I'd like to duplicate your testing, Al. How did you take measurements,
and what should be considered acceptable results?
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The test purposes were somewhat limited.  The main thing was the flow
distribution for the in-cowl radiator with the curved scoop.  I measured the
flow coming through with a small hand-held anemometer. As expected, most of
the flow tended to go to the far end.  I was able to determine the internal
baffling necessary to get a fairly even flow distribution over the core
area.

Other then that I could measure the pressure drop through the cores (simple
water manometer) to verify they were as expected.  No heat transfer test was
involved.

Al  (Notice - plain text so as not to offend your storage size sensibilities
:)