Multi-rotor Aircraft Noise Cancellation

You can hear the noise level of a multi-rotor aircraft taking off in the video at the 1:50 mark. A Special Message from CEO and Founder, JoeBen Bevirt - YouTube


The company claims less than 70 decibels on the ground when at 500 feel of altitude. Investor Reid Hoffman claims 65dB at takeoff. https://twitter.com/reidhoffman/status/1372639364782514177?s=20


They use NASA's LEAP-Tech to noise cancel the rotors.

LEAPTech demonstrates electric propulsion technologies – Climate Change: Vital Signs of the Planet
 

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Asynchronous - cant have all those little propellers choppin air in phase lock! Almost like one of those preamp design where you have a bunch of parallel transistors, where the uncorrelated noise of each adds in a good way.