GCHT - tips of blades go around at something like 170 MPH - they also can get ice the whole way up them... so it can fall off as one sheath. You can imagine ice + fast blade could make a nasty affect.
At the wind farm I visited they said that during icy weather your not allowed to stand under them..
It's also a fact the UFO's are attracted to 3 bladed turbines rather than two for all the obvious reasons so I don't need to go into it :-)
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