Check the web site Jerry for a sketch on a water manometer.
 You can plumb into the static pressure tap on your altimeter
 for a reference pressure. Use a bit of porous foam on the
 ends of the pressure measuring tubes. You can also use a short
 piece of small tubing with three or four small holes drilled
 around the ends on the side of the tubing. Pinch the tube shut
 or weld it shut. Place the end of the measuring tube where ever
 you want to measure the pressure. Always measure the pressure
 at the same airspeed.

 Paul Lamar

Paul,
In addition to measuring pressure fore and aft of the radiator, I will
mention once again the technique used to diagnose cooling problems by some of
the local builders.

They found that painting stripes of "dirty" crankcase oil on the cowling
perpendicular to the supposed direction of air flow, then going and flying a
short flight.

When they get back, take a picture or sketch of the flow patterns, very
enlightening -- many times the air was flowing INTO an outlet.

Bill Schertz
KIS Cruiser #4045

Yes. This a good qualitative thing as opposed to the quantitative
pressure measurement. It always helps greatly to have a magnitude
on a problem so one can set priorities.

Paul Lamar
 
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