[TowerTalk] Phillystran As Strong As They Claim?
K8RI-on-TowerTalk at tm.net
Sun Nov 20 11:21:34 PST 2011
On 11/20/2011 2:07 PM, K7LXC at aol.com wrote:
> Well, you could always do a destruct test to find out.
> When the current generation of Phillystran was introduced, the
> only way to terminate them was with cable clamps. The problem was that the
> aramid fibers cold flowed with potential fatal problems. Later they developed
> the Preformed grips for Phillystran and that problem was solved.
> There aren't any grips available for the 1200 so you still have to
> use clamps. Is the strength compromised? Maybe. But if you're using 1200,
> it's probably for a non-mission critical application such as your dipole
> support. If your 1200 Phillystran breaks in your application, there would be
> a lot more to worry about than your dipole.
It also makes a big difference on how the clamps are installed. The U
bolt goes on the "dead side" while the clamp goes on the load bearing
side. The side with the indentation carries less load than the side
with the clamp. OTOH it depends on how slippery the thimble and
Phillystran interface is. I've been using a fair amount of the 1200 and
never had a problem even with the "big dents" on the dead side.
Likewise I'd not want to put a big load on the 1200 when the Big Grips
are available for the 2200# test and it's not all that much more expensive.
Don't forget to use the moisture caps and glue them in place.
> Steve K7LXC
> TOWER TECH
More information about the TowerTalk