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View Diary: Energy - some good news (for once) (237 comments)

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  •  I believe the slower moving (none)
    blades of newer wind turbines has all but eliminated the bird issue.  According to one article, "the latest blade and turbine designs crank at only 28 rpm's, about seven mph, slow enough for birds to see to avoid impact."
    •  28 rpm does not equal 7 mph (none)
      I don't know how that figure was found -- it's utter nonsense. Modern wind turbine blades do indeed turn at low rates (even between 10 and 20 rpm). But they are so long that at the tips they could be flying along at over 150 mph. For example, a 35-meter blade at 20 rpm is moving at 164 mph at the tip.

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