[TowerTalk] EHS or Philly?

[Keith Dutson]

You may not be getting all the facts about Phillystran stretch and tower
failure scenarios.  My experience is that the stretch has not caused any
problem with my installation of a 150 foot 45G tower in very high wind
(hurricane Rita).  I use 6700.

I think it is possible to have a twisting failure associated with use of
multiple heavy beams on TIC Ringrotors.  It is for this reason that I am now
in the process of installing a star guy bracket at 115 feet.

73, Keith NM5G

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Jon M. Knodel
Sent: Monday, May 15, 2006 3:42 AM
To: towertalk at contesting.com
Subject: [TowerTalk] EHS or Philly?

Hello all,

Thank you everyone for the help so far.  I am back with another question
though.

It has actually worked out that Phillystran would be cheaper for me to use
than EHS broken up into +/-11' lengths.  I am leaning toward using it but am
concerned about it's stretch.  On K7NV's site (great info on tower design
and loading), he runs one scenario (using Grape software) where the tower
actually failed due to the Phillystran stretching too much.  Granted, this
was on a 100' R45 and my installation would be a 60' R25 but it still
concerns me.  Do you think it would be possible for the Philly to cause a
failure?  If so, would it be solved by increased initial tensioning (say 15%
or maybe even 20% as compared to 10%)?  Any help would definitely be
appreciated.  Thanks.

73 es gud DX!,

Jon, N7XW
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