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Posted by Derek Broughton on January 2, 2006, 4:53 pm
 
dold@XReXXGoodX.usenet.us.com wrote:


Yes, and I had a partridge apparently run smack into the side of my garage
and break its neck (no sign of anything to spook it, and no windows on the
garage).  Yet both those birds are _capable_ of dodging objects moving much
faster than that :-)

Either there was something already seriously wrong with the bird, or we
should stop building _anything_ above ground to protect the birds (though
that wouldn't have helped your owl!).
--
derek

Posted by philkryder on January 2, 2006, 5:48 am
 

Derek Broughton wrote:

" ...None.  I've never known a bird that's incapable of dodging a slow
moving
object...."

How slowly do the tips of 180 meter diameters move in a 20 mph wind?


Posted by Iain McClatchie on January 2, 2006, 8:25 am
 Phil> How slowly do the tips of 180 meter diameters move in a 20 mph
wind?

Biggest turbines I've heard of are 110 meters in diameter.

Regardless of diameter, tip speed ratios are as high as 6 for turbines,
so the tips might be going as much as 120 mph.  This is faster than
birds fly, but on the other hand 70 MPH is faster than people can run,
and folks deal with it on the freeway every day.


Posted by SolarFlare on January 2, 2006, 4:48 pm
 The large turbines do not kill birds according the UC
studies. The size is recommended to be increased to
alleviate any bird kills people have imagined.

message

move in a 20 mph

diameter.

as 6 for turbines,

is faster than

than people can run,


Posted by Derek Broughton on January 2, 2006, 12:47 am
 Texan wrote:


I love that one.  What's so "obvious" about it?  The commercial wind
generators I have seen (in excess of 100) don't rotate fast enough to hurt
a bird.  I have not seen or heard any evidence that modern generators are
killing birds, yet it's a constant argument.

The first part is certainly true, but many people find them quite
attractive.  The wind farm at Cap du Chat, Quebec is beautiful.

Except, of course, for the fact that the only bird that could get hit by
such blades would be a frozen chicken from a chicken cannon (and it would
take some mighty fine shooting)...
--
derek

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