Spotted on top of a skyscraper near Copley, these helical
Darrieus turbines are a less-frequently used type of windmill, in which the blades spin around the vertical axis of its tower, rather than around an axis perpendicular to the ground. They seem to do best at smaller sizes, and through they don't need to be rotated to match wind direction, they've got other disadvantages that have led wind generation to focus mainly on the more conventional designs.
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