On Tue, 05 June 2001, "J. Kincade" wrote:
> One Talkian pointed out that Phillystran isn't that
> much more expensive than steel, and of course does
> away with all the guy wire resonance problems.
A topic currently near to my heart (and wallet).
I'd like to see the numbers for your 75 foot R45 tower.
For a tower of ~120 feet (for which I'm in the throes
of constructing) the numbers show that Philly is about
2X EHS.
Roughly, for 120ft tower, 80% guy spacing, four guys
per side equates to 1650' guy wire. With 4 insulators per guy (48 total) and
10 grips/guy (8 for the insulators, 2 for the ends) and ignoring
thimbles/sleeves (and ASSEMBLY time!) I get:
************EHS
1/4" EHS $0.189/ft
502 insul $5.50
Big grip $6.00
(1650ft * $0.189) + (48 * $5.50) + (120 * $6.00)
= $1296
************Phillystran
6700# Philly $1.29/ft
grip $12.00
(1650ft * $1.29) + (24 * $12.00)
= $2416
**************
This uses TexasTowers pricing (no not the cheapest for
steel, but the only game for Philly).
EHS costs can go lower as you can shop around: there are various commercial
sources and, albeit limited, hamfest-type availability for EHS stuff. If
you're in a hurry, then, well, this is somewhat moot.
The performance issues have been addressed here before, and IMO, the classic
tradeoff of
price/performance looks good for Philly. But for me
(and I'm trying to build two such towers), I'll take
the "sweat equity". :)
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