Dyson, the company that uses a centrifugal separator in its vacuum cleaner, has another piece of neat tech, a Bladeless fan that works on the Coanda effect.It's a really interesting concept, if you don't mind spending $299.99 for a 10" freaking table top fan.
In any case, Bill Sweetman notes that this technology might have application for a VTOL aircraft, though, as he notes this concept is very close to the ejector lift concept that has failed abysmally when it has been tried.
For quieting a fan, it might work, for generating lots of thrust for VTOL, I'd wait for more tests.
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