[TowerTalk] Re: Pretensioning Phillystran

[Jan.E.Holm@telia.se]

     Aren´t you supposed to prestretch Phillystran before you
     install?  That will take away the initial strech and it will
     act like steal I suppose.
     In Europe we have stuff called Parafile and I guess it´s
     just about the same as the Philly stuff, this Parafile is
     supposed to be prestretched to 30% (I think it was 30)
     of the breakingtourqe before you install on tower and then 
     set it to correct installed tourqe.
     I´ve heard about people almost loosing their towers due to 
     not initialy stretch the Parafile. It will then lenghten quite a
     bit after the first windstorm.
     Is it 30% for Phillystran also? It might be something else
     but 30 since I´m not sure on my memmory, I´m getting old!

     73, SM2EKM
-------------------------------

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Från:	n4zr@contesting.com [SMTP:n4zr@contesting.com]
Skickat:	 den 14 september 2000 21:21
Till:	towertalk@contesting.com
Ämne:	[TowerTalk] Pretensioning Phillystran


My 100' Rohn 25 tower now has top guys of 6700 lb Phillystran which I
bought used (I know it's overkill).  My question -- what's the 
recommended
static tension for this size Philly?  Even at 300 lb, it looks plenty
straight, because the guy material itself is so light, but I suspect the
answer is more complicated than that.  I know Philly is stretchier than 
EHS
of equivalent strength, so I want to make sure and not have any more 
wiggle
than necessary.

73, Pete Smith N4ZR

Contesting is ... Extreme Radio

The World Contest Station Database 
is back up and running at
http://www.qsl.net/n4zr 



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