Re:Stanford lab envisions delivery drones that save energy b...
by jcims on Thursday June 04, 2020 @08:05AM
(#23415508)
This report puts it at 66db at 25m away (20m up, 15m lateral)
https://www.hollyspringsnc.us/DocumentCenter/View/23698/Soun...
So say 4m overhead 3m away (5m distance) you have ~80db
https://www.omnicalculator.com/physics/distance-attenuation
Add in the fact that you would feel the prop wash from it and it's going to be a fairly disturbing experience.
The critical issues of safety etc seem like a much bigger deal to me.