Author Topic: Linemen Knots  (Read 633 times)


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Linemen Knots
« on: January 29, 2019, 01:31:05 AM »
This began as a reply to another thread,
but I realized that I was digging into such
a separate topic that that should have its
own --and better placed, forum-wise-- thread.

I had a chat about this with a lineman recently. The cable they use for guys is called "guy strand", and it is of 1x7 construction. The short bits used for making terminations are called "dead-ends" (in local parlance, at least), and as you said they are sized to fit just so and are preformed into a helix. The dead-ends have dabs of paint to indicated where the wrap needs to start in order to obtain the requisite length.
Ah, we're getting close to Knots in the Wild --real stuff,
and not in-the-books-copied_&_parroted-forever!

I watched one pair of guys installing such a guy line and
dead-end (I'd think "eye" still a better name); it seemed
to me that at about the mid-wrap point the experienced
guy of the two --doing the wrapping-- had the other guy
allow a bit of tension into the line prior to making the
finishing (away from eye tip) wraps?!  --my surmise (and
my recall).
(This sort of matches what I'd think would be the best
way to seize and eye --to have the away-most
seizing be on slightly slackened tail so that it (which
will be the *point of entry* for the SPart; the initial
contact point of other strands and offloading...)
will take up force only at higher loads, coming to the
assistanced of the nearer-to-eye seizing which will be
getting more load at first.)

With "linemen", I hope to somewhere, somehow, get
insight & literature circa 1915 of the use of "linemen's
aka "butterfly knot".  I'd think that there
should've been some documentation of this knot which
reportedly (Burger, cited by CLDay's Art of K&S)
was in their repertoire.  (And, today ... ?)

Well, here's something coming up from Googling "linemen..."
Points of things standing out to me:

0) no remarks about knots and HMPE lines,
but in the video of types & care of rope, they clearly show
Samson blue 12-strand Dyneema (HMPE) rope.
1) "Alpine knot" vice "butterfly" or "linemen's" ! (no strength rating)
2) square knot : efficiency 60%
3) running bowline & likewise "snubbing knot" (=backhanded/crossing knot + 2hhitches) 50%
4) "sheet bend knot" : not rated !? (poorly tied in "no hands" video)
5) clove hitch : 60% (no note re relative size of hitched object
6) bowline on a bight = bwl = 65%

I wrote in # 3 "likewise" because I thought that the likeness
(which was pertinent for strength) came in both of these
structures having the SPart drawn through a bight/eye
of rope, and . . .
... then I recalled that so far as I can discern, the break
in the running bwl came in the *knot* and not at
the eye --look for the broken strand! (in which case one
must really ask how the knot when coming AFTER such
an off-loading-of-force point as the passage of noose
SPart through eye point can be weaker than the
knot alone ? !!!  Well, their test of it was around a rather
small ring, and the knot bore against the eye (but, still,
THAT doesn't strike me as an extra weakening!?).

I'm really impressed that they got "60%" for the
squaREef knot --one might wonder if someone
was reporting, as occasionally is done, "strength LOST"?!

Another linemen's site
gives these knots as to-know from their apps:
Blood knot,
bowline on a bight,
double sheet bend,
Farrimond friction hitch,
figure 8,
Lineman?s loop,
monkey fist,
running bowline,
sheet bend,
snubbing knot,
square knot,
taut-line hitch.

At least they know that they're "linemen" and not "alpine"!