[TowerTalk] polyrod

[Keith Dutson]

Fiberglass may be sensitive to UV, but I doubt it affects strength
significantly in tower guying applications.  However, I also prefer the
light weight and easy storage of Philly and would not consider using other
non-conductive cable for segment lengths less than about 300 feet.

73, Keith NM5G

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Roger K8RI on Tower
Sent: Sunday, May 01, 2005 12:32 AM
To: RICHARD BOYD; Tom Rauch; towertalk at contesting.com; Ken Claerbout; Jim
Lux
Subject: Re: [TowerTalk] polyrod

I purchased the Phillystran  3 or 4 years ago (give or take) and it wasn't
that expensive.  50 some cents a foot for the 4400# test and I don't seem to
find the invoice for the 6600#, but as I recall it was around a $1 a foot. 
I'll probably find it when I go out to the shop.

As far as stretch, there is very little in Phillystran, *but* you have to
compare the stretch along with the give in the catenary.  I think you will
find 1/4" EHS has a relatively deep catenary and when tentioned to the same
as the equivelant Phyllistran allows more tower movement.  At least it sure
feels like it to me, but that is not a real measurement.

Still, even at 50% I'd go for the Kevlar.
Both Phyllistran and fiberglass are sensitive to UV and moisture unless
protected and the Phyllystran is so much easier to work with.  OTOH I do
like fiberglass and carbon fiber for airplanes. <:-))

Today's prices are 89 cents a foot for the 4000 and $1.29 for the 6700.  The
ratings are a bit different than when I purchased mine, but I'm not sure
about the item numbers.

I haven't been able to find anything referencing poly rod, polyrod, or
polygon on the net except links back to TowerTalk.

73

Roger Halstead (K8RI and ARRL 40 year Life Member) N833R - World's oldest
Debonair CD-2 www.rogerhalstead.com
> Polygon was 33-50% the price of Phillystran at the time, as I recall.  
> I think it was very non-stretchy.
> -- KE3Q
>  ----- Original Message -----
>  From: Jim Lux<mailto:jimlux at earthlink.net>
>  To: Roger K8RI on Tower<mailto:k8ri-tower at charter.net> ; Tom 
> Rauch<mailto:w8ji at contesting.com> ; RICHARD BOYD<mailto:ke3q at msn.com> 
> ; towertalk at contesting.com<mailto:towertalk at contesting.com> ; Ken 
> Claerbout<mailto:K4ZW at Staffnet.com>
>  Sent: Saturday, April 30, 2005 10:44 PM
>  Subject: Re: [TowerTalk] polyrod
>
>
>
>  ----- Original Message -----
>  From: "Roger K8RI on Tower" 
> <k8ri-tower at charter.net<mailto:k8ri-tower at charter.net>>
>  To: "Tom Rauch" <w8ji at contesting.com<mailto:w8ji at contesting.com>>;
> "RICHARD BOYD" <ke3q at msn.com<mailto:ke3q at msn.com>>;
>  <towertalk at contesting.com<mailto:towertalk at contesting.com>>; "Ken 
> Claerbout" <K4ZW at Staffnet.com<mailto:K4ZW at Staffnet.com>>
>  Sent: Saturday, April 30, 2005 6:29 PM
>  Subject: Re: [TowerTalk] polyrod
>
>
>  > Why not just use one of the Kevlar cables such as Phylistran, or 
> the one  AES  > sells just called Kevlar guy line?
>  >
>  > Nothing is perfect, but so far I like the light weight and easy 
> handeling  of  > the Kevlar lines.  Does Polyrod have an advantage 
> over this?
>
>  What's the stretchy-ness of Polyrod vs aramid (Phillystran, Kevlar, 
> etc.) vs  steel?  That has an effect on the overall performance.
>
>
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless 
> Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with 
> any questions and ask for Sherman, W2FLA.
>
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> 


_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.

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