Thinking out loud here, and as an EE not an ME.
If you clip onto a vertical leg, when the fall arrest deploys, the only thing
stopping the Gorilla hook from sliding down the vertical member is the cross
brace where it is welded to the upright. Common sense says that it will wedge
itself into the ‘V’ created between the cross brace and the tower leg.
If you clip onto a cross brace, the Gorilla hook will slide down the cross
brace and stop at the weld between the tower leg and the cross brace. Again,
it will be wedged into the ‘V’ between the two. There will be virtually no
leverage on the cross brace, so the chances of the cross brace bending away
from the tower would seem to be almost nil.
The only way I could see either method failing is if the weld pulled away from
the leg. What am I missing?
Ken K6MR
From: Stephen Shobe<mailto:info@pioneerantenna.com>
Sent: Sunday, September 6, 2020 19:14
To: Kim Elmore<mailto:cw_de_n5op@sbcglobal.net>
Cc: towertalk@contesting.com<mailto:towertalk@contesting.com>
Subject: Re: [TowerTalk] How to Clip on with a Fall Arrest Lanyard
My advice as a certified tower climber is to always use the legs of the
tower with your fall arrest system. Cross members have weld points subject
to failure if the load is significant. And remember, none of the connecting
points are engineered fall arrest points
On Sun, Sep 6, 2020 at 18:47 Kim Elmore <cw_de_n5op@sbcglobal.net> wrote:
> Would you mind being a bit more detailed about this? What it is,
>
> exactly, and how you manage it? I think I know, but I want to be
>
> certain. Also, if there's a permanently-installed a safety line on a
>
> tower, what's required to properly use it?
>
>
>
> Kim N5OP
>
>
>
> On 9/6/2020 4:17 PM, K9MA wrote:
>
> > I’ve been using a 5/8 inch lifeline and a rope grab. It takes one trip
> with the gorilla hooks to put it up, and another to take it down, but all
> the other trips are much easier.
>
> >
>
> > 73,
>
> > Scott K9MA
>
> >
>
> > ----------
>
> >
>
> > Scott Ellington
>
> >
>
> > --- via iPad
>
> >
>
> >> On Sep 6, 2020, at 12:05 PM, Dick Green WC1M <wc1m73@gmail.com> wrote:
>
> >>
>
> >> 4. All this further convinces me that a safety cable is the best way to
> climb a tower. I plan to install one on my Rohn 55 tower provided I can
> find one with enough clearance to pass through the three TIC rings on my
> tower.
>
> > _______________________________________________
>
> >
>
> >
>
> >
>
> > _______________________________________________
>
> > TowerTalk mailing list
>
> > TowerTalk@contesting.com
>
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
> --
>
>
>
> Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP
>
> SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
>
>
>
> /"A great second violinist plays second fiddle to no one." //– Robert C.
>
> Marsh, Chicago Sun-Times./
>
>
>
> _______________________________________________
>
>
>
>
>
>
>
> _______________________________________________
>
> TowerTalk mailing list
>
> TowerTalk@contesting.com
>
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> --
Stephen K. Shobe
Pioneer Antenna & Tower
25182 Derby Cir
Laguna Hills, Ca. 92653
949.235.9202
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