Originally Posted by a[_3_]

On Sep 5, 1:10 am, Leviterande Leviterande.
wrote:
Hi all!
Volf propeller hehttp://www.rexresearch.com/volfprop/volfprop.htm

I have been thinking alot about how this propeller would do, I wish I
had a workshop, CNC, and tools to build one.. this amazing prop is
claimed to be super quiet and efficient.. so any more info from the
article on it or any word of experience in propellers are very
appreciated

what about this propeller
( hit CTRl-F and type "An Air Screw That Ridicules Propeller" )http://www.rexresearch.com/aero/1aero.htm

regards
kalle

--
Leviterande

That's a very old patent! If you think about a propeller for low speed
flight, think about it as a rotating wing. You'll notice high
perfornance gliders have long slender wings, and the best props look a
lot like that, with an additional twist. Ducting helps, as do Q tips
on propeller edges, but I did read somewhere you gain as much
efficiency by increasing the propeller diameter as the q tip length.
Makes me wonder if the vortex decreasing terminations on wings might
be as well used just by increasing the wingspan by that amount.