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RE: Wind power plant leaves its wings hanging / Windkraftanlage lässt die Flügel hängen
Finding the cause can take a while. In the building process of the blades, all kinds of things can go wrong. This looks like a glass, carbon, or Kevlar laminate that failed. This could be due to stacking the layers wrong, mixing the resin wrong, curing the resin wrong or a design failure. If the turbine was spinning at the time it could also be it was spinning too fast; when the blade tips break the sound barrier they can come apart as would happen to airplane Props.
Do the blades not have the ability to adjust the pitch of the blades 😕
Yes, they can control RPM through variable blade pitch, angle to the wind direction and a brake, but these systems can fail as they need power to work.