[TowerTalk] [Bulk] Re: Phillystran

[Grant Saviers]

I strongly advise against saddle clamps.  The problem is creep of the 
plastic jacket causes the clamp force to decay with time.  Until the 
clamp completely cuts through the jacket the clamp force decays.  At 
room temperature it took about 3 weeks and at least 4 tightenings to get 
the saddle to cut through the jacket.  I used a torque wrench to set the 
tightening force and measured the residual torque at a late time each 
cycle.  I built a tension tester and verified saddle terminations will 
slip well below the breaking strength of the Philly.  Even after 121 
days and 4 tightening cycles the saddle clamp torque values indicated 
continuing creep and reduced termination strength.  I was unable to 
achieve more than 30% of the break strength of the Philly.  (25000# 
Philly and 7000# load for slippage).

Later I tested the proper terminations for this Philly (Spelter sockets 
with epoxy) on a commercial 100,000# tension test stand  and the guy 
failed at 28000# tension and not the termination. See NCJ Nov-Dec 2014 
for my article.

I've seen bent booms as a result of using saddle clamps.  I also found 
them loose on my steppIR 4L after a year on the 1200 size so will never 
use it again.

Phillystran says use grips on all 2100 and larger.  Follow the directions!

Grant KZ1W

On 10/21/2015 13:06 PM, Mike Reublin NF4L wrote:
> Mostly what compresses is the jacket. No strength is lost. My SteppIR uses Phillystran (as a bridle) with small saddle clamps. The PS is very flat in the clamps.
> 73, Mike NF4L
>
>
>> On Oct 21, 2015, at 3:46 PM, GMuller885--- via TowerTalk <towertalk at contesting.com> wrote:
>>
>> All:
>>       Thank all of you for the input.    Based on all the input my guys and
>> stays are of Phillystran 6mm dia 2100 lbs  break strength. I am using guy
>> line clamp kits, three to a  connection.  The only question left is that if
>> the Guy cliompress  the Phillystran how much strength is lost if any?
>>
>> Gerald Muller K9GEM
>> GMuller885 at aol.com
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