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21 February 2023 by David Hauser @ Silicon Beach
The toroidal propeller's unique, closed-form design makes it a significantly quieter alternative to common multirotor propellers on commercial uncrewed aerial vehicles.
Turning a ring wing into a propeller reduces noise in the 1-5 kHz range and creates a much less intrusive sound reminiscent of a breeze rather than a high pitch drone propeller. At the same time, propulsion stays at the known levels.