This is a quote from a web page about wind turbines..
[A turbine blade can break, resulting in blade throw due to improper design, improper manufacturing, improper installation, wind gusts that exceed the
maximum design load of the turbine structure, impact with cranes or towers, or lightning. The distance a blade piece can be thrown from a turbine
depends on its mass, shape, speed at the time it breaks from the machine, the orientation of the blade at the time of the throw, and the wind speed at
the time. These occurrences are rare, due to better testing, design and engineering of commercial wind turbines.]
See page www.healthandsafetybusiness.com...