Airplane Sound effect based on rotational speed of axle or electric motor

I am building a peddle-powered airplane for my son. It will actually be powered by a battery and electric motor. I would like the sound to change pitch with motor or axle speed. Any ideas? Im stumped.

by howt9934
February 16, 2022

A whistle?

To not penalize the propeller too much, have it under a cylinder disk, close to the axis of rotation. Have its weight "balanced" to not increase the torque instability.

by vanderghast
February 19, 2022

How are you controlling motor speed? If there's a control voltage, it could also feed to some kind of electronic sound generator (probably using a voltage-controlled oscillator in combination with other things.)

by OakBloodThree
February 22, 2022

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