Although two blade wind turbines have significant efficiency advantages over three blade turbines they are brutally difficult to engineer. The reason - vibration. But the Chinese company Envision Energy is giving it another try where other...See moreAlthough two blade wind turbines have significant efficiency advantages over three blade turbines they are brutally difficult to engineer. The reason - vibration. But the Chinese company Envision Energy is giving it another try where other have failed. Their secret - digital rather than mechanical controls. Written by
David Foss
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