Redesign makes drones quieter and less annoying without losing thrust

Drones could soon drone less. A redesign of the rotor blades could decrease the noise created by drones and make sure they are less irritating.

The buzzing sound from drones comes mostly from what sort of fast-rotating blades slice through the air. Researchers at Australia’s Royal Melbourne Institute of Technology, dealing with Melbourne-based aerospace company XROTOR, are looking to suppress the buzz by redesigning the blades.

The researchers give attention to inter-frequency modulation, the sum of several different frequencies made by rotor blades …

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