Aiming to cut costs of offshore wind power, British engineers are developing a vertical-axis turbine that would eliminate the need for a tower, reduce stress on blades and foundations and ease installation work. The developer of the 10-MW device hopes to have a 1-MW proof-of-concept machine at work within two years. A full-scale demonstration would follow. Photo Courtesy Wind Power Ltd./Grimshaw In the vertical-axis concept, blades spin close to the ocean surface, like a fan on its back. The device has two rotors attached to inclined arms. These arms rise from a vertical axle in a module sitting just above
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