They are drag-based turbines, so when does drag pose a problem and decrease efficiency, in terms of the part of the rotation?
Any links would help too
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Basically, the amount of drag on the cup side is much higher than the amount on the dome side, so it turns to the cup side.
http://www.windpower.org/en/tour/wtrb/drag.htm
http://users.ticnet.com/mikefirth/whrlaero.htm
http://www.macarthurmusic.com/johnkwilson/MakingasimpleSavoniuswindturbine.htm