>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 09 November 2005 11:23
>To: 'Microcontroller discussion list - Public.'
>Subject: RE: [OT] Savonious turbines
>
>
>> You can extract energy from them, though they are quite
>> inefficient. Googling for "savonius efficiency" (note 
>> spelling!) shows a few small DIY designs that have managed to 
>> get usefull amounts of power e.g. a 3' diamater x 4' tall 
>> rotor delivering 52 Watts at 12.5mph wind speed:
>> http://www.windstuffnow.com/main/vawt.htm
>
>That does not look like a real Savionius (drag-type) rotor to 
>me, more like a Darius (lift-type)!

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).

Regards

Mike

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