[upofadown]

In comparing the Volocopter noise to helicopters it would be something with no main rotor noise and 18 heavily loaded open tail rotors:

* https://en.wikipedia.org/wiki/Helicopter_noise_reduction#Tai...

My guess would be that the noise wouldn't carry as far due to the higher frequency but would be very loud closer in, again due to the higher frequency.

[FabHK]

Interesting, could well be. So not a problem for people on the ground, but you'd want to have a good noise-cancelling headset while on board.