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Smooth_Imagination t1_j320jue wrote

Tip velocity leads to infra sound, audible noise and strike risk. A solution to this would be smaller, multibladed propellers that create higher torque at much lower tip velocity.

Technically a wing will produce force at zero RPM and there would not be an efficiency loss as such. The settling on 3 bladed propellers is largely due to their mass (hence why to resolve this they need to be smaller). Making them smaller reduces power, unless you combine them with cowlings.