Hot air and OBP's

Subject: Hot air and OBP's
From: Andrew Taylor <>
Date: Wed, 6 Sep 2006 22:58:18 +1000
On Wed, Sep 06, 2006 at 09:58:34PM +1000, Paul Taylor wrote:
> You neglected to include the units; "106dBA" is meaningless otherwise.

True.  I wasn't suggesting 106dbA SPL at the neighbours - it'd take a 747
to achieve that @1km.  The acoustic power of the proposed turbines for
Bald Hills (at high wind speed) would be between that of a helicopter and
a chain saw according to the Wikipedia examples.  This is far from the
"almost completely silent" Evan suggested.  The modelled SPLs at the
neighbouring properties aren't large - the sites are 700-1300m away -
but could still annoy humans at the closer sites, depending on the
character of the noise.  I doubt its much of a problem for birds but
its very hard to be sure.



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