This report puts it at 66db at 25m away (20m up, 15m lateral) https://www.hollyspringsnc.us/DocumentCenter/View/23698/Sound-Pressure-Level-Test-Report https://

This report puts it at 66db at 25m away (20m up, 15m lateral) https://www.hollyspringsnc.us/DocumentCenter/View/23698/Sound-Pressure-Level-Test-Report 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 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.