I certainly would not draw any conclusions from that test.
Too many variables. Why don't you build a water manometer
and measure the air pressure in front of the rad directly?

Paul Lamar

Paul,  in the manometer gif file,  all tubes are connected to a reference source. Where should that source be.  Cockpit, static line?  or is this just a base line for comparison and the source really doesn't matter.  T.W.


It is a base line only. Best to connect it to your static port system.
That seems to be the most reliable and least likely to be affected
by other changes such as cockpit air vents open or closed. In the old
days when we were doing street cars (1970 Trans Am Firebird) we used
the inside of the front door. :)

On the other hand connecting it to the pito tube to reference
dynamic pressure (airspeed pressure) works well but it is a little
tricky keeping track of the pressure being above or below dynamic pressure.
The positive side of this trick is a much lower height U tube can be used.
For certain airplanes with very little room in the cockpit this
can be an advantage.

Paul Lamar

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