must be like one of them new blade less fan designs
they had them for sale at a local shop for moving air about the house, just a centrifugal fan in the base and a big ring on top in which air came out of the perimeter. they suc....err...blew as well. what a pathetic idea THAT was
E-revo 3.3 conversion, 249kv outrunner, 6s, MMM
the porthole from the noob world an here has been opened!! that's how i got in.