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Re: sort o' ot -- maybe some good news on extant dino's and towers

Depends on the human. And what kind of bird?

I tend to agree with that..... :-)
Are there data that show the combo of flashing/steady are absolutely necessary? Intuitively, it seems obvious that a safe flashing-only format could be devised, but I don't really know.

Nor do I know. I just know that speaking as a pilot, it is far easier to detect the ones that have both steady and flashing lights.

As I understand it, having only read the abstract, guy-wire bird fatalities are included in the analysis. Most of the towers sampled, btw, are "110-146m AGL" w/ 3 being ">=300m".

Most are low, but I regularly have to divert around two that are a half mile high and directly on my course ( I normally fly the Cherokee at 1200-1800 feet), and there are about six or eight nearby towers that are 1400-1600 feet high.

--- On Fri, 3/20/09, jrc <jrccea@bellsouth.net> wrote:

From: jrc <jrccea@bellsouth.net>
Subject: Re: sort o' ot -- maybe some good news on extant dino's and towers
To: d_ohmes@yahoo.com
Date: Friday, March 20, 2009, 12:39 PM
What would be an acceptable swap-off rate between reduced
avian fatalites and increased human fatalities? Some of
these towers stick up a half mile above ground level and
many general aviation aircraft cruise lower than that.
Other towers that don't stick up so far, are close
enough to airstrips to be above the flight path for landing
and taking off. Would one to one be about right, or should
we be prepared to sacrifice more birds than humans?

On a loosely related subject, how should birds be protected
from tower guy wires?  At least we pilots know the
approximate angle at which the unlit guy wires diverge from
the tower.

----- Original Message ----- From: "don ohmes"
To: <dinosaur@usc.edu>
Sent: Friday, March 20, 2009 9:08 AM
Subject: sort o' ot -- maybe some good news on extant
dino's and towers

> > Perhaps adjusting the flash frequency could reduce fatalities even further... > > "Communication towers, lights, and birds: successful methods of reducing the frequency of avian collisions" --