Neil A. Kruiswyk wrote:

Paul,

    I think Jeff got the point across better than I did and he's right...
if those little deviators I drew aren't done correctly, it will be worse.

    An alternative to the pickup truck test, how about statically testing
the rad by flowing hot tap water through the core and pumping air via a
large fan.  This way you can monitor temp, pressure and fluid flow rates
more easily.  I'd love to do it myself on my new rad just to gather the data
which could be extrapolated to flight conditions.

    Darn it all...  I wish I was retired.... so I would have the time to do
all these fun things...   Maybe I can talk Jim into doing it...  :)

Neil

Good idea Neil. Looks like you need a little diverging curvitcher(s)
where the duct walls attach to the rad.
Got any five HP squirrel cage blowers lying around? :-)

Paul                    Neils-rad-test.jpg

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