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Why don't they use GPS to determine the altitude and the speed? Even a $100 GPS in my car is more precise than the speedometer.
by rorrr 15y ago
Why don't they use GPS to determine the altitude and the speed? Even a $100 GPS in my car is more precise than the speedometer.
- jwr 15y agoGPS will give you groundspeed, not airspeed. And since you don't get lift from groundspeed, it isn't as relevant to keeping the airplane flying.
- rationalbeats 15y agoExample of a Cessna flying backwards lift generated by headwind. http://www.youtube.com/watch?v=u2tiaWPNamE http://www.youtube.com/watch?v=u2tiaWPNamE
- rorrr 15y agoBut it can be used to precisely determine the altitude, which is what really matters if you're about to crash or go too high and stall.