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Noise reduction methods

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SamP

Well-Known Member
Joined
Nov 4, 2016
Messages
94
I've been reading about articles about how for delivery drones and EVTOLs to see widespread use, they need to address how noisy they are. Trying to think of ways to make them quieter.
Reducing propeller speed is probably the biggest. I would imagine that would mean more blades for a given engine / motor. This is probably first order. Would one big motor be quieter than many motors?
How about airframes? A more efficient airframe means that you would need less power to push it through the air. Would a conventional design be less quiet than a flying wing?

I've read that morphing wings reduce noice because there are no gaps from the ailerons and flaps, which create a lot of noise.

Other ways to make airplanes in general more quiet?
 
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