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 ...

Over the past few years, labels such as DJI have pushed drones into the mainstream. If you look closely, you'll notice that a majority of them have four propellers, while helicopters have fewer of ...

CycloTech is one of very few companies looking beyond the humble propeller, pitch-controllable rotor or ducted fan to provide thrust for electric VTOL aircraft and drones. Instead, it uses a series of ...