I have been thinking about the savonius again lately..
let me run this by you..
say you live in a building where you dont really have a lawn on which to install your wind generator .. i live upstairs in a two story condo.anyway, i think the savonius would be perfect, because it is designed to spin horizontally to the ground ..what if you attach it to the side of your building as in the picture..or out your window.. this way whichever way the wind is going past your generator it will turn..
Barring any building codes or any bs like that ,this is just hypothetical..
i made an anemometer last night with an attached wind direction indicator the wind is generally from the north at the moment but sometimes it comes from the ground, like the arrows indicate ..
with bearings on the top of the savonius , it just might work..