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Backup/alternate Airspeed Devices

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  • #16
    The thought of throwing out a small little windmill, spinning wildly perhaps in the midst of a big ice storm, trying to measure the airspeed does not fill me with confidence. I think a larger diameter windmill would be needed to get a more reliable result. Good thing that several large windmills are carried as standard equipment on every airplane.

    Thus, I guess if one engine was shut down, and then the freewheeling RPM of that engine was measured, one could calculate the airspeed reasonably accurately .....

    Of course trying to measure the airspeed may cause what was initially a small problem to turn into a very big one, but just an idea....
    You just can't avoid the potholes.

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