"I tend to think its cogging noise,which is not an issue. Magnets interacting with the de-energized stator putting impulses of magnetic drag on the motor, then the thrust tube acting to amplify the sound like a megaphone."
My fms fans in my other planes all make this noise, and I believe this explanation is it exactly.
My fms fans in my other planes all make this noise, and I believe this explanation is it exactly.
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