As major delivery firms expand aerial fleets across hundreds of US cities and towns, residents increasingly complain about a high-pitched rotor buzz. While companies introduce quieter propellers and pod-enclosed propulsion systems to muffle the sound, acoustic experts warn that low-altitude flights over residential areas will continue driving community backlash.
Nature lover Ashley Schmidt no longer spends much time in her garden in the Dallas suburb of North Garland. She has also stopped cycling to local parks where she previously enjoyed taking close-up photos of bugs, lizards, and toads because she cannot stand the sound of delivery drones flying overhead to deposit online orders for her neighbors.
They emit this very annoying buzz. It triggers my fight or flight response.
Ashley Schmidt, administrative assistant
Schmidt states that she hears the vehicles on their approach, inside her home when they pass directly overhead, and as they depart. She is joined by a growing number of residents living with the sound of drones dispatched by companies like Amazon and Walmart as those businesses seek to speed up home deliveries.
Expansion of Prime Air and Local Deliveries
Delivery drone services have shifted from novelties into everyday life for many people across the United States. Amazon Prime Air is in the process of expanding its delivery network to nearly 500 cities and towns, transporting items that fit into shoe box-sized spaces. The service has also launched to customers in and around Darlington in the north of England.
Smaller delivery operations are appearing as well, letting customers in select US cities order flying treats from local pizza shops or ice cream parlors. Although urban environments already contain steady background traffic noise, Antonio Torija Martinez, a professor in acoustic engineering and psychoacoustics at the University of Salford, notes that the sudden whine of drone rotors cuts through the everyday hum.
Particularly noticeable, even when overall sound levels are relatively low.
Antonio Torija Martinez, professor in acoustic engineering and psychoacoustics at the University of Salford
Unlike airplanes, drones operate at low altitudes and may fly directly over residential areas. Torija Martinez explains that these vehicles expose communities that have not previously experienced significant aircraft noise to new sounds, making residents more sensitive to local soundscape changes. Research indicates that individuals react strongly to noises perceived as novel, intrusive, or frequent, though people who directly benefit from a drone delivery service tend to be less bothered by the noise.
While the Federal Aviation Administration regulates commercial drones in the US, it faces criticism for permitting noisy operations. The agency maintains that operators and local community leaders carry primary responsibility for addressing community concerns.
Engineering Quieter Blades and Pod Systems
Startups and major logistics providers are experimenting with engineering fixes to lower decibel levels and alter troublesome sound frequencies. London-based Greenjets has designed a propulsion system that encloses spinning blades inside a pod to muffle sound and direct noise away from the ground. Darren James, future technologies lead at Greenjets, states that the startup set out to address both noise level and the frequency of that noise
.
The Greenjets design reduces noise by at least two thirds compared to standard open-air propellers by employing slower rotor speeds and materials that minimize vibration noise. This low-noise technology has already seen deployment by police and harbor security teams in Germany, as well as by conservationists in Africa tracking poachers without detection. Battlefield operators also seek quieter unmanned vehicles to prevent alerting enemies, though Robert Tollast, a research fellow at the Whitehall think tank The Royal United Services Institute (RUSI), notes that speed often takes priority for larger drones used in the war between Russia and Ukraine.
Make it faster, not less quiet, seems to be the approach.
Robert Tollast, research fellow at The Royal United Services Institute (RUSI)
Other engineers are tackling the problem from the propeller outward. Greg Sharrow, a Detroit-based entrepreneur, began designing quieter drone parts in 2012 while attempting to film a classical music performance. Concluding that most drone noise originates from the propeller rather than the motor, Sharrow Engineering is focusing on developing “ultra-quiet” drone rotors.
Corporate Modifications and Resident Pushback
Major operators report making hardware adjustments to address public complaints. An Amazon spokesperson states the company achieved measurable sound improvements
through custom propellers on its latest drone designs, producing almost half the perceived sound of prior generations with a milder tone. Amazon also confirms it is working to reduce noise across its entire fleet.
Similarly, drone maker Wing, which supplies delivery vehicles for Walmart, designs its propellers to minimize noise. It also varies its flight paths to prevent repeated overflights over individual homes and neighborhoods. Torija Martinez warns that complaints will likely increase as the drone sector expands and operations spread beyond localized areas.
For residents like Schmidt, current technical adjustments fall short of a remedy. She states that the only satisfactory outcome would be a complete halt to aerial deliveries in her neighborhood until companies resolve the nuisance.
