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Weird blades

PostPosted: Fri Jan 15, 2010 4:55 pm
by windgat
Here are some blades I spotted a while ago. On the face of it, they seem to contradict several basic design principles. Any comments?

Re: Weird blades

PostPosted: Fri Feb 18, 2011 9:21 am
by danielxavier
Must be somekind of high torque blade design. Surely they can't go fast. Looks like it captures the wind somehow, but the blades is not pitched very much. Hmm.. Hard to think it's effecient in any kind of way. :D

Re: Weird blades

PostPosted: Sun Mar 06, 2011 10:20 am
by windgat
Yes - large surface area, therefore high torque slow speed. Also note how the blades are broader nearer the tip, the opposite to the usual aerodynamic design.

Re: Weird blades

PostPosted: Mon Mar 07, 2011 11:25 am
by dawie
What is the scale/ diameter of these blades? Looks like bicycle spokes were used...

Maybe more of an artist's effort/ creation?

Re: Weird blades

PostPosted: Mon Mar 07, 2011 1:48 pm
by windgat
Each blade is at least 1m long. Perhaps the diameter is about 2.5m. As far as I know, its intended as a new design which is claimed to be more efficient than the more usual thin blade design.

Re: Weird blades

PostPosted: Mon Nov 04, 2013 7:52 am
by zohanx747
Also note how the blades are broader nearer the tip, the opposite to the usual aerodynamic design.