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The topic is very interesting.  I have a lot of (dumb) questions.  For example, what happens if something like a hurricane comes along?   Presumably the design is such that the rotors are built to withstand more than "ordinary high velocity" winds, but have "farms" these gadgets ever been subjected to gale force winds for extended periods?   I realize it's a bit like asking a nuclear plant to withstand a Richter 7 scale earthquake and the consequences are obviously less catastrophic even in the case of structural failure, but there are places where it's all too easy to imagine a farm of shattered rotors (for example, off Cape Cod).

Hannah K. O'Luthon
by Hannah K OLuthon on Fri Oct 21st, 2005 at 07:21:07 AM EST
The Danish experience during the winter 1999 is that while a significant part of the forest went down with the storm (40% in some areas), only a few (less than 10) of the 6,000 turbines then erected had any damage.

I don't know if that answers your question but it's a start!

In the long run, we're all dead. John Maynard Keynes

by Jerome a Paris (etg@eurotrib.com) on Fri Oct 21st, 2005 at 08:25:51 AM EST
[ Parent ]
Thanks, Jerome.   It's already useful to know that there
is a "decoupling between" damage to the rotors and damage to the turbines.   Rotors cost less to replace than turbines, I suppose.

Hannah K. O'Luthon
by Hannah K OLuthon on Fri Oct 21st, 2005 at 08:33:06 AM EST
[ Parent ]
I believe it is more likely that the whole turbine topples than damage to just the rotors. When wind speed is too high, the blades are turned parallel to the wind - then, the structural stress is relatively small, while most of the wind pressure is contributed by the tower and nacelle. The images of damaged turbines I saw were such - e.g.:

(This one didn't shut down during a storm)

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Fri Oct 21st, 2005 at 09:56:46 AM EST
[ Parent ]

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