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@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Roger K8RI on Tower
Sent: Sunday, May 01, 2005 12:32 AM
To: RICHARD BOYD; Tom Rauch; towertalk@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@earthlink.net>
> To: Roger K8RI on Tower<mailto:k8ri-tower@charter.net> ; Tom
> Rauch<mailto:w8ji@contesting.com> ; RICHARD BOYD<mailto:ke3q@msn.com>
> ; towertalk@contesting.com<mailto:towertalk@contesting.com> ; Ken
> Claerbout<mailto:K4ZW@Staffnet.com>
> Sent: Saturday, April 30, 2005 10:44 PM
> Subject: Re: [TowerTalk] polyrod
>
>
>
> ----- Original Message -----
> From: "Roger K8RI on Tower"
> <k8ri-tower@charter.net<mailto:k8ri-tower@charter.net>>
> To: "Tom Rauch" <w8ji@contesting.com<mailto:w8ji@contesting.com>>;
> "RICHARD BOYD" <ke3q@msn.com<mailto:ke3q@msn.com>>;
> <towertalk@contesting.com<mailto:towertalk@contesting.com>>; "Ken
> Claerbout" <K4ZW@Staffnet.com<mailto:K4ZW@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.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
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.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
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.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
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