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speaking of which, how *do* speedometers work inside planes? is it just an airflow meter? [/B][/QUOTE]
They are called pedo tubes. The take the outside pressure and calculate the pressure forced into the tube.
With the new GPS systems in the aircraft now, the speed is calculated between the signal beacons.
The out side pressure of the aircraft is regulated by the Barometric Pressure. Example: 29.92 would be mostly a good sunny day. High pressure. A low front could register at 26.05.
The altitude of the aircraft is depended on this pressure. Once an aircraft reaches approx 18,000ft, regardless of the pressure below, the altimeter goes back 29.92.
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