Zipline says every drone in its delivery fleet now adjusts its flight in real time to make less noise, a system it calls “sound-optimized dynamic flying”. The company announced the fleet-wide update on 27 October.
At take-off the drone measures the wind and feeds that into a sound model to choose the quietest way to move from hovering to flying on its wing. Once it reaches cruising speed and height, it switches off all but one motor. Near the end of a flight it may dip its nose or climb to change speed, using wind and gravity rather than extra motor power.
Zipline says sound exposure per flight is down 68% and peak volume is down 24% compared with its 2025 fleet. Both figures come from its internal modelling, not from microphones on the ground, and the company presents them as the result of a wider set of hardware and software changes, so the new flight system’s own share is not stated. It also says the average flight is now 53 seconds shorter and uses 21% less energy.
Noise is one of the most common objections to delivery drones near homes. Independent ground measurements would show whether residents actually hear the difference.
Source: Zipline announcement