# The Engineering Challenge of Reducing Delivery Drone Noise Startups and tech giants race to quieten delivery drones amid rising community complaints. - **Source:** [BBC News](https://www.bbc.co.uk/news/technology) - **Published:** 2026-10-28 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/61ce980c-f7f2-44e1-9f6c-14a0ef169730 ## Rising Noise Complaints Residents in areas like North Garland, Texas, report significant distress due to the persistent buzzing of delivery drones. As companies like Amazon and Walmart scale operations to hundreds of cities, the auditory impact on residential neighborhoods has intensified. This noise is perceived as uniquely intrusive compared to standard urban traffic sounds. ## Psychoacoustic Impact Factors Professor Antonio Torija Martinez notes that drone noise is particularly irritating because it is novel and occurs at low altitudes. Unlike traditional aircraft, drones fly directly over homes, exposing communities to new soundscapes. Research indicates that individuals who do not personally benefit from the delivery service are significantly more sensitive to noise. ## Regulatory Responsibility Gaps The Federal Aviation Administration regulates commercial drone operations in the US but faces criticism for permitting noisy delivery flights. The agency maintains that operators and local community leaders hold the primary responsibility for addressing noise concerns. This regulatory ambiguity leaves residents with few formal avenues to mitigate the constant overhead buzzing. ## Enclosed Propulsion Systems London-based startup Greenjets is addressing noise by enclosing spinning blades within a pod structure. This design muffles sound and directs noise away from the ground while utilizing slower rotor speeds to reduce vibration. Beyond delivery, this low-noise technology is currently being tested for harbour security and wildlife conservation tracking applications. ## Tipless Propeller Innovation Sharrow Engineering, led by Greg Sharrow, developed twisted, loop-shaped propellers to eliminate the noise generated by blade tips. Originally designed for marine use, the technology is now being adapted for drones. The company claims these rotors are dramatically quieter than standard designs, successfully validating the concept for various aerial delivery applications. ## Corporate Mitigation Strategies Amazon claims its latest drone designs utilize custom propellers that produce nearly half the perceived sound of previous generations. Meanwhile, Wing, which supports Walmart deliveries, focuses on varying flight paths to prevent repeated overflights of single homes. These operational adjustments aim to distribute the acoustic burden more evenly across residential neighborhoods. ## Military and Tactical Context While delivery services prioritize noise reduction for public acceptance, military applications have different requirements. US Special Forces are exploring stealthier drones, yet current battlefield priorities in conflicts like Ukraine favor speed over silence. The engineering trade-off remains complex, as increasing velocity often conflicts with the goal of minimizing acoustic detection. ## Future of Urban Logistics As drone delivery services transition from novelty to everyday infrastructure, the pressure to solve the noise problem will likely escalate. Without significant advancements in acoustic engineering, public opposition may hinder widespread adoption. The industry must balance the efficiency of rapid home delivery with the necessity of maintaining acceptable urban sound environments. ## Sources covering this story - https://www.bbc.co.uk/news/articles/ck1exgejq3xvo?at_medium=RSS&at_campaign=rss — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._