on the Ross-Ice Shelf in Antarctica. In Europe, small Savonius wind turbines can sometimes be seen used as "animated" advertising signs in which the rotational movement helps to draw attention to the item advertised. They sometimes feature a simple two-frame animation. Tethered airborne Savonius turbines Airborne wind turbines Kite types When the Savonius rotor axis is set horizontally and tethered, then kiting results. There are scores of patents and products that use the net lift Magnus effect that occurs in the autorotation of the Savonius rotor. The spin may be mined for some of its energy for making sound, heat, or electricity. Gallery References External links Build your own model Savonius wind turbine Windside Savonius Type Wind Turbines for use in Extreme Environments Savonius turbines for dynamic environments www.spinpower.org How to build a Savonius wind generator Notions of Wind Energy for the Complete Idiot Vertical axis wind turbines Finnish inventions 20th-century inventions