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Old 02-29-2008, 10:12 AM   #5 (permalink)
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Originally Posted by Frank Lee View Post
Ummm... airplanes don't know what windspeed is unless they're interfacing with the ground!
I'm no expert on this (only been in a co-pilots seat 2 times) BUT Pilots can calculate wind speed (at their altitude). The first plane I flew (piper Cherokee 180) did not have GPS and relied upon the tower to give a radar ground speed and heading, we then (re-)calculated out flight plan based on the wind speed/ direction. Plane #2 Cessna (rental) had a GPS which interfaced with the majority of the avionics and was able to display the wind speed + direction (in near real time) based on ground speed and Airspeed + Heading.
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