> >  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

Jerry Hey wrote:

  Paul and Bill,  I am still trying to get used to the positive turn
the discussion and design of my cooling system has taken.   I am
building a manometer and will certainly remember the crankcase oil
trick.  I'll have to get some from a Lycoming flyer as  rotary crank
oil remains clean.   Jerry

 
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