Library filed under Structural Failure

Hundreds of Tuscola County wind turbine motors being replaced, design flaw blamed

Gauger said it’s been determined that the “old style” keyway pitch motor is “defective” and not able to handle the load that is being placed on them by longer blades. He said the motor is essentially trying to adjust itself so that there is less drag. “What happens is on the upswing or the downswing, it’s actually got some slack in there and that’s that clunking noise that people are hearing,” Gauger said.
14 Jan 2017

Collapse of wind turbine under investigation

So far the investigation has found that one of three blades failed catastrophically, thus creating a huge imbalance that caused the tower to buckle 15 meters above the ground and led to the structure crashing down. ...The incident comes weeks after a similar turbine collapse in the Mecklenburg Pommeria town of Süderholz.
4 Jan 2017

http://www.windaction.org/posts?p=4&topic=Structural+Failure
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