greek freak
piezo elec can measure pressure.but it still must take a reference pressure from outside the aircraft in the immediate flt environs.
There is often a yawning gap between ground speed and airspeed.
The airbus (and boeing) air data modules do something just like that.
A pitot head externally and a short length of tube within the fuselage transfer a dynamic air pressure to a small electronic box (the ADM or similar) that converts the info to an elec signal for processing at the adiru or similar for use and distribution to a variety of other computers and indicators.
Last edited by ampclamp; 11th Jun 2009 at 00:03.