I'm almost afraid to bring it up; but there's a drone system being/was being used in Africa to deliver medications and whatnot that use blades designed after Owl wings that make almost no sound. It just sounds like a small gust of wind.

[–] Gradually_Adjusting@lemmy.world 2 points 1 year ago (1 children)

Is that those helical rotors? They're supposed to be quite good in many ways, not just the noise.

[–] jabathekek@sopuli.xyz 5 points 1 year ago* (last edited 1 year ago) (1 children)

~~I don't think so. IIRC it was more about the shape of the blade and that there was only one of them on each rotor with a weight built in to balance it out. With one rotor turbulence is negligible while still providing lift.~~

Here's a video about Owl wings.

Here's ~~the~~ another video about the rotors:

https://iv.melmac.space/watch?v=z58RORCUTao

[–] Gradually_Adjusting@lemmy.world 4 points 1 year ago

Incredible stuff! The sound is so buttery. People who understand harmonics and sound engineering amaze me. I'd love to build a quadcopter that sounds like this.

Pretty slick invidious links there too, last time I used that it wasn't a very good experience, glad it's come this far.