> 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)!

Wouter van Ooijen

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

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