Library filed under Safety from Michigan

Out-of-control wind turbine ‘shook itself apart’ in Huron County

The turbine exceeded designed rotation speeds — 14.4 rpm (revolutions per minute) -- and at that speed, blade tips are moving at about 200 mph, according to Exelon. It created an imbalance as blades picked up speed. At the time of collapse, rotation speeds reached 18 rpm, officials said. “At that high of an rpm, the thing just basically shook itself apart.”
6 May 2016

400-foot wind turbine falls in Huron County

A nearly 400-foot, 485,000-pound wind turbine has fallen down on a farm field at the site of the state’s first utility-scale wind project. Oliver Township Supervisor Larry Krohn said it came down at about 5:20 a.m. in the middle of the field. ...The fall marks the second incident in less than a week in which a wind turbine has failed.
25 Feb 2016

https://www.windaction.org/posts?location=Michigan&p=2&topic=Safety
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