dean van winkle wrote:

Paul

When I was a Flight Test Engineer at Cessna in the late 60's, we used the small closed end pipes with the static holes that were connected directly to inches of water gauges in the cockpit.It was not an exact science with the aircooled engines, but I suspect it might work a little better to measure pressure drops across a smooth radiator.  In any case, you would not want the tubes mounted directly against the faces of the radiator, but instead perhaps an inch or so away so that they are seeing free stream air.

Dean
RV-9A

 
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