On Sun, 2 Dec 2007 17:02:07 -0600, "Maxwell"
wrote:


"Blueskies" wrote in message
et...

"Jim Logajan" wrote in message
.. .
The following thread on the Van's Air Force web site was of general
enough
interest that I thought it worthwhile to bring it to the attention of
other
pilots:

http://www.vansairforce.com/communit...ad.php?t=24147

Would be quite useful if it really worked. Of course there would still be
strikes with inattentive and near-sighted birds. ;-)

I rate this things right in there with the old ultrasonic deer
whistles you put in your car grill. Driving down the road was supposed
to put out a noise to scare the deer. Somebody made a small fortune on
those before they proved they don't work.


I wonder about doing the candy stripe spiral on them, or painting the
blades different colors...


There is a design used on the American Airlines (and perhaps others) high
bypass engines that is reported to be effective too. Might check it out at
airliners.com or something. Considering visibility difference and rotation

That's used to let people on the ground know if the engine is still
turning. An engine coasting to a stop is nearly silent and is silent
if you are out on the ramp wearing hearing protection.


Roger (K8RI)

speed, the design you are testing appears even more visible. My guess is, it
will work.