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.
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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.