d b wrote:

Perhaps it isn't obvious. The airspeed indicator is a DELTA pressure guage.
It is not an absolute pressure guage. If the indicator reads the same delta
pressure, the two devices have to be producing the same delta pressure.
One sucking, the other blowing.

Or, if you have a good static system, one that neither blows nor sucks,
but just sits there!
--
Change "netto" to "net" to email me directly

Eric Greenwell
Washington State
USA