vertical axis wind turbine savonius type

The Savonius wind turbine is a type of vertical axis wind turbine (VAWT), used to convert wind force into torque on a rotating shaft to create rotational motion that can be used in many applications, including generating electricity. A turbine consists of a number of air wings, usually - but not always - mounted vertically on a rotating shaft or frame, either ground-mounted or tethered in airborne systems.