How to regulate drone noise when there is a dearth of data?

Photo credit: Pok Rie from Pexels by David M. Sykes, Vice Chair, The Quiet Coalition "Drone delivery” is here and coming to your yard soon—and the revolution will not be quiet. These excellent and sobering notes by Eddie Duncan about the  International Institute of Noise Control Engineering's European Quiet Drones e-symposium held October 2020 will