> I'm pretty sure it's still a drag type design, just more 
> efficient than the classical S shaped rotor.  A first glance 
> tt looks as like the design uses aerofoil shaped blades; 
> however in reality they are just a modified cup shape to 
> provide a better forward/back drag ratio (for want of a 
> better description).

I am sure the design was meant to do drag only, but from the shape I
suspect it will actually work (partially) on lift. Conclusive evidence
would be the (unloaded) radial speed: if it is ever higher than the
windspeed it works (at least parially) on lift.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist