Why do air craft still rely on archaic pitot tubes?

  • Thread starter wolram
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  • #1
wolram
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Main Question or Discussion Point

If GPS is or can be so accurate why do air craft still rely on archaic pito tubes? sure keep one as a back up, but for your PRIMARY instrument no way.
 

Answers and Replies

  • #2
russ_watters
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GPS provides ground speed, not airspeed. If you were in an airliner and had a 100kt tailwind, GPS would think you were going supersonic.
 
  • #3
Yes for stall and flight characteristics the indicated airspeed is the most important. I don't know if for navigation they use INS (Inertial Navigation System) with laser guided Giro's, or GPS for speed calculation.
 

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