A savonius windmill is a vertical axis windmill that converts wind into torque on a rotating shaft.
These types of windmill are actually less efficient than your common windmill however they are much cheaper to make so if you where planning to go in this direction I would probably advise making a lot of them. In all seriousness do not make a homemade savonius because it will not deliver the energy results you need.
Common places that you will see these vertical axis windmills are on the top of buses to provide cooling and at an event like the football or at the beach where promotional banners are placed on each of the sides.
If you do want to make a savonius then I recommend using plastic buckets or bins cut in half as the blades/sails. This is the easiest option but if you are looking to get a little more technical and also gain a bit more efficiency I recommend some light sheet metal or acrylic with a twist to each blade (refer to picture).
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