Usually wind power generators are placed in areas where the wind prevails in one direction, but they are also designed to act like weathervanes. For upright horizontal-axis generators, the aerodynamics of the wind turbine’s axis are such that there is the least wind resistance when the axis is directly parallel to the flow of wind. This means that the blades of the turbine will always spin perpendicular to the wind.
Vertical-axis generators have a stationary axis that is always aligned perpendicular to the wind. The blades of a vertical axis generator spin parallel to the flow of wind.
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