[TowerTalk] guy wire resonance

[Joe - WD0M]

I used Phillystran on my tower in coastal Alaska 
for a decade - no problems, even with 3 inch 
icing on the Phillystran and 125 mph winds.  It 
too was 4000 pound rated.  For a picture (which 
appeared in QST, taken by my wife), see:

http://www.xyz.net/~joe/

73,
Joe
ex-WL7M
now WDØM



At 10:25 AM 12/23/2005, Doug Robson wrote:
>OUCH!!!!
>Dave, for those of us considering the heavy outlay for Phillystran,
>describe for us the conditions under which your Phillystran was
>"cut" by the ice storm.  You used the word, "cut", and I'm trying
>to envision how ice would have caused a cutting.  A weight overload,
>causing a bursting, yes, but a "cut" ?  Please help an ignorant fella
>understand.
>Phillystran is a huge investment.
>If it is subject to loss from ice, that gives cause for concern
>and maybe a need to rethink. Do you know how many pounds of
>tension your Phillystran was under prior to the ice storm?
>
>Doug - KI4LZC
>
>
>Dave <k4em at mindspring.com> wrote:
>
> >I am replacing some guy wires on a 70' Rohn 25 
> with a 40m beam. What is the spacing between 
> the insulators so the guys are not resonant? 
> The guys are 3/16" EHS and I am using the 500D 
> insulators. I lost 3 guys due to ice storm last 
> week, the Phillystran was cut in half on the 
> top 2 guys but the bottom guy with all steel 
> cable was undamaged. It was the 4000lb Phillystran.
> >
> >Dave