Drones fly while rotating multiple propellers at high speed, which makes a loud buzzing noise during flight. Some drones have reduced noise by devising the shape of the propellers. In the 'Slow-motion ...
This paper by TSAW Drones discusses the need for less noise in UAVs, how these toroidals can benefit the drone industry, how these propellers came to be and how exactly they reduce the noise. Also, in ...
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