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6nf | 2 years ago

Previous urban delivery drone services had trouble with noise complaints, could be related to that?

discuss

borissk|2 years ago

One way to solve the noise problem is a drone flying high and dropping the parcel on a long rope.

rkagerer|2 years ago

Thanks. The boat prop offers some efficiency gains in mid-range speeds and better hole shot acceleration, but I guess the benefits don't carry to smaller scales and less viscous surroundings.

ThisIsMyAltAcct|2 years ago

With 4 counter-rotating props, that would not surprise me

rkagerer|2 years ago

Recently discovered Sharrow boat props. Apparently the guy who invented them first developed the the concept for reducing noise from drones filming orchestras. I'm surprised we aren't seeing more widespread availability yet of "tipless" drone propellers.

https://youtu.be/MNnB_50Z20I?t=553s

Previous HN discussion: https://news.ycombinator.com/item?id=33949895

Similar design MIT patented: https://news.mit.edu/2022/lincoln-laboratory-inventions-win-...