Rocks & mirror
Encyclopedia of Marine and Energy Technology

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. 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.