Everybody talks about UAV (personal or Taxi service) being a game changer to our way of traveling and commuting.
Looking at ongoing research activities and some early flight demonstrators I notice that most of them have multiple, unducted/open, and interacting rotors. Solely from a system noise point of view I would assume that this will probably be the least successful approach.
Are there any new conceptual designs that will even stand a chance if community noise exposure and annoyance is really a topic (aside of "certification" or legislation issues)?
I think this is a good question. Noise is a drawback for rotocraft.
But it is unavoidable, like helicoper. But we can reduce it with low rotation speed. Increase the dimension and number of blades is good choice. If you want to eliminate the noise, maybe you can try fixed wing or flap wing.
With low rational speeds, hence low frequency tonal noise, we should only apply A-weighted metrics to assess the noise... problem solved!
I think it is actually pretty funny that the maiden flight videos of new UAVs never play the sound of the actual flighing vehicle but nice music, e.g. https://vimeo.com/256817519.
news update: First video ever discovered of flying eVTOL with PAYLOAD and with actual sound of interior and exterior noise.
https://www.youtube.com/watch?v=hrOfq-35iK0
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