Sometimes at certain speeds, I hear a high-pitched creak or squeak. What’s up with that? Is it the propeller, the motor, or something else?
Cavitation probably.
I forgot to mention that the sound has a specific pitch, which I don’t think is characteristic of cavitation.
Trailing edge whistling might also be a cause. I had it on my YPRA wing
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I sanded the wing without applying the “Donaldson Trailing Edge” technique, only smoothing the edge slightly. As a result, the noise has become much less frequent.