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I also wonder why airspeed is derived by some formula applied to the measurement of flow along a tube that can be blocked by ice and become useless. Why not use
by cedws 3y ago
I also wonder why airspeed is derived by some formula applied to the measurement of flow along a tube that can be blocked by ice and become useless. Why not use GPS primarily and fall back to that if needed? Or the other way around even.
If you expect an instrument to routinely fail, it just seems logical to at least have a backup.
- thatswrong0 3y agoGround speed and airspeed are not the same thing. You need to measure airspeed directly. And I think there are generally 3 pitot tubes on planes.
- flerchin 3y agoJetstreams are hundreds of kph. Meaning groundspeed can be hundreds of kph off of airspeed. Meaning GPS is a very poor backup airspeed indicator.
- jimmaswell 3y agoIt's trivial to calculate true speed from altitude and ground speed. Is the altitude not reliable?
- mb7733 3y agoAir speed is relative to the air around the plane, not the ground.