The Savonius rotor is a S-shaped wind turbine patented by Sigurd J. Savonius, a Finn, in 1929. One common homebuilt version of this wind turbine is made from 55 gallon drums split lengthwise and offset to make two cups that the wind catches and spins.
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Date: 2007-06-18 01:29 pm (UTC)http://en.wikipedia.org/wiki/Savonius_wind_turbine
Here's a graphic of my sign (http://www.denniskeim.com/lj/WindNotWarSign.png) with the basic details.