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Old 02-15-09, 12:15 AM   #6
Bob McGovern
Lurking Renovator
Join Date: Feb 2009
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Given that the large turbines rotate at around 40 rpm, it would have to be low frequency. Subsonics can certainly travel some distance thru ground or water, but I'm guessing the headache story is another bit of propaganda. Amazing how people near wind sites will start feeling headaches after reading a story like that, too.

I've stood under the big'uns, directly beneath two hundred commercial wind machines, and they are quiet. Basically you can't hear the blades above the ambient wind required to turn them. The trucks on the highway 2 miles away were louder than the turbines.

Now my Bergey 8-footer ... that's another matter entirely. It sounds like a police helicopter when it's really shrieking outside.
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