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Old June 13th 06, 08:55 PM posted to rec.aviation.ifr,rec.aviation.student
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Default CFII oral exam guide questions?


Michael wrote:
Then you really didn't understand the physics of how a pitot tube
works.

Think of a pitot tube as an energy conversion device. There is energy
in moving air. There is energy in pressurized air. A pitot tube is a
device for converting the former into the latter. An ASI is actually a
pressure gauge (usually a brass bellows that drives the needle) that
measures the difference between the ram pressure and the static
pressure. The ram pressure is always going to be higher, because the
speed of the airplane is forcing air in, and pressurizing it.


I understood that. I just way over estimated how much air went through
the pitot tube. Any tube that has a hole in the front and a smaller
hole in the back would do the job. The net pressure to the A/S
indicator would be less but that's just a calibration issue. So I
understood the concept but over estimated the flow.

-Robert