[TowerTalk] Phillystran sizing and use

[Bill Putney]

Nat,

I put up a 50' tower and used 3/16" (Next size up from 1/4" - the first size
that uses guy grips). I think if you look, the ultimate strength (breaking
strenght) on the Phillystran is higher than the EHS for the same diameter. I
think the spec that Phillystran publishes is "working strenght" which is the
safe strenght for an application. The working strenght is a derating from the
breaking strenght.

I used Phillystran down to the last 6' at the bottom of each guy. Got all the
stuff from Texal Tower. Make sure you get all the thimbles and such that goes
with it. On a tower the size of yours or mine, Phillystran isn't a hugh expense
and I think it's well worth it. I might have a different opinion if I was
guying 1500' towers in the midwest somewhere.

- Bill

On Sep 8, 12:57pm, Nat Davis wrote:
> Subject: [TowerTalk] Phillystran sizing and use
>
> I hope this is a simple question.....
> I am putting guys on top of my 40' Rohn 25 tower.  The Rohn book calls for
> the use of about 50' of 3/16 EHS for each guy.  50' seems to fall in the
> "to be avoided" lengths per the ARRL antenna book discuss on guy wire to
> antenna interactions...
>
> So, if I wanted to use Phillystran for the upper section of each guy (using
> EHS for the bottom section hedging against vandals, etc.), what size of
> Phillystran do I need?  I can not find anything that says which of the 5
> diameters of Phillystran stocked by Texas Towers I should use.  To get the
> same breaking strength per guy as 3/16 EHS, I would need to use the middle
> size of the 5.  Is that overkill?  What should I tension the guys to?  The
> same 10% figure as in EHS?
>
> Or, at 40', is it going to be worth the hassle of using Phillystran at all???
>
> Thanks and have a good weekend,
>
> Nat Davis
> N4EL
>
>
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>-- End of excerpt from Nat Davis



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