Toroidal propellers turn your drones and boats into noiseless machines

This video has a noise comparison for the drone propellers at 1:11<p><a href="https:&#x2F;&#x2F;twitter.com&#x2F;MITLL&#x2F;status&#x2F;1611438712683958306" rel="nofollow">https:&#x2F;&#x2F;twitter.com&#x2F;MITLL&#x2F;status&#x2F;1611438712683958306</a>

Related discussion from a couple of months ago: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=33949895" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=33949895</a> (156 comments).

A company called Aviation Partners developed and licensed winglets. They developed the spiroid winglet that is a loop at the end of the wing, claiming increased efficiency over plain winglets. No takers so far, first tested 30 years ago. <a href="https:&#x2F;&#x2F;www.aviationpartners.com&#x2F;aircraft-winglets&#x2F;types-blended-winglets&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.aviationpartners.com&#x2F;aircraft-winglets&#x2F;types-ble...</a>

Saving you some time: skip the first video, go straight to the second.

See this discussion one day ago: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=34558670" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=34558670</a>

Is there anywhere you can buy these for a DJI mini 3 or Mavic Pro?<p>I wonder if someone is already 3D printing this design in a compatible format.

Low content article imo - much more a marketing piece (though at least isn’t trying to pretend it is not)

Wonder if it helps with seaweed issues

can those be used in very high flow channel conditioner &#x2F; ventilation or is usual wheel blowers more efficient? or external unit of split ac system to pack more radiator surface in less space(i understand the higher power comsumpion of it)?

Could they make these out of a stiff silicone? Seems more doable than with a traditional prop.

Didn&#x27;t read much but look like they could foul pretty solidly.

How do they compare to <a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Rim-driven_thruster" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Rim-driven_thruster</a> ?

I guess we will see them in Ukraine

As someone who grew up doing a lot of outdoor activity, I assumed part of the fun of owning a drone and&#x2F;or motorboat was annoying the shit out of the people around you?