Airspeed drops to zero when motor is turned on.

I'm doing bench tests with the pitot tube and the values are what are expected according to the ardupilot wiki.  When I turn the motor on, the noise drops.  The more I up the throttle, the less noise, until it flat lines at zero at about 1/3 max throttle.  Airspeed reads as expected when I blow on it, and I've swapped out the pitot tube with a another one and got similar results.  What could be causing this problem?

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