Helical Blades
The blades of a Darrieus turbine can be canted into a helix, e.g. three blades and a helical twist of 60 degrees, similar to Gorlov's water turbines. Since the wind pulls each blade around on both the windward and leeward sides of the turbine, this feature spreads the torque evenly over the entire revolution, thus preventing destructive pulsations. This design is used by the Turby, Urban Green Energy and Quiet Revolution brands of wind turbine.
Read more about this topic: Darrieus Wind Turbine
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“By the flow of the inland river,
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