Buzz of drones is more annoying than any other kind of vehicle

said braka 8:55 AM
By Alasdair Wilkins
Amazon, UPS, Domino’s Pizza and other companies

planning drone delivery services may be heading for discord. A preliminary NASA study has discovered that people find the noise of drones more annoying than that of ground vehicles, even when the sounds are the same volume.
“We didn’t go into this test thinking there would be this significant difference,” says study coauthor Andrew Christian of NASA’s Langley Research Center, Virginia. It is almost unfortunate the research has turned up this difference in annoyance levels, he adds, as its purpose was merely to prove that Langley’s acoustics research facilities could contribute to NASA’s wider efforts to study drones.
Nonetheless, the results indicate the extra irritation the 38 subjects experienced when listening to drone noises was as if a car were suddenly twice as close as it had been before.