“The technology can be used in many applications, including aerospace, aeronautic (drones), HVAC, pumps and renewable energy,” Sharrow says. For now, these propellers seem to have only one ...

A team at MIT’s Lincoln Lab has developed a new propeller shape that significantly reduces the noise associated with drones. [PDF via NewAtlas] Inspired by some of the experiments with “ring ...

Most famous of these is probably the toroidal propeller that made waves a while ago, mostly in the field of flying drones ... and the design in the patent by Sharrow Marine didn’t provide ...