Here is a suggested test duct. If we all build the same test ducts
we can compare radiator aerodynamic flow numbers for different
available radiators.

The pitot tube can 
be a bent peice of small tubing. Use it like a wand to point 
it into the wind and check the velocity of the air all over
the radiator face. Also all over the aft face of the radiator.

A water tube manomometer can be use as per the drawing on the
ACRE news letter web site. As Bill Freeman mentioned an
air speed indicator can also be used.

Check the temperature of the air inside the duct adjacent to the
core face. Air is heated when it is slowed and compressed.

The same tricks can be used as a poor man's wind tunnel to
check the design of your diffusers. 

If you can figre out how to heat water with 150 HP's worth
of heat (111,900 watts or 6400 BTU's per minute) you
could check the overall functioning of your entire 
cooling system before you went flying. Perhaps a 
natural gas water heater in the bed of the pickup truck.

I would welcome comments and suggestions for improvements.
 
Paul Lamar            testduct.gif
 
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