Prusik Loop Knots

[Dan_Lehman]

@knot4u post:18

My educated guess is that there are fishing knots that can be tied in rope that are stronger than the Strangle Noose and the Butterfly Loop. To be clear, by “strength”, I mean the propensity to resist rope breakage. I have no hard data, but who does? If I had to put my money on strongest hitch, I’d put my money one of the fishing knots if they’re up for consideration. The Berkley Braid versus the Strangle Noose, that’s not even fair. Do we even have to run a test for which is stronger?

“Educated” --how so?
The highlighted rhetoric suggests otherwise.
(Of all the knots to choose, BB is one rather like
the supposed inferior noose. And, with nooses, one must
consider the hitched object, too --relative diameter, i.e..)

–dl*

[knot4u]

@Dan_Lehman post:21

@knot4u post:18

My educated guess is that there are fishing knots that can be tied in rope that are stronger than the Strangle Noose and the Butterfly Loop. To be clear, by “strength”, I mean the propensity to resist rope breakage. I have no hard data, but who does? If I had to put my money on strongest hitch, I’d put my money one of the fishing knots if they’re up for consideration. The Berkley Braid versus the Strangle Noose, that’s not even fair. Do we even have to run a test for which is stronger?

“Educated” --how so?

…by analyzing test results from Knot Wars and drawing reasonable conclusions. I hate to burst your bubble, but this is not quantum mechanics. How are you educated on the issue of strength for these knots?

[knot4u]

@Dan_Lehman post:21

(Of all the knots to choose, BB is one rather like
the supposed inferior noose. And, with nooses, one must
consider the hitched object, too --relative diameter, i.e..)

For this thread and the posted article, the hitched object is a carabiner or other climbing anchor with a similar diameter. Also, I find it odd you say the Berkley Braid is similar to the Strangle Noose. I find these knots to be obviously different in multiple ways.

[SS369]

Another grip and slide method to consider that will work is using the Prohaska hitch, aka Blake’s hitch.

I have not personally tried this knot in rock climbing, but it worked during the recreational tree climbs that I have done. It was used to facilitate ascending up the rope using the end of the rope I climbed.
It has the advantage, should you not have prusik cord, of being a grip and slide hitch that works with the same diameter as the parent rope.

SS

[alpineer]

@Dan_Lehman post:19

1. the butterfly eyeknot is asymmetric,
   so a different structure obtains in loading its 1st end
   than loading its other end;
2. there are at least three ways of dressing/orienting
   the eye legs of the knot --crossed one way, crossed the
   opposite way, and uncrossed (probably the most often
   pictured).
   .:. That amounts to SIX distinct cordage constructs that
   might be seen by the test device, without consideration
   of the differences between materials tested (softish,
   compressible line vs. firm round line (think, caving cordage),
   vs. … .

Has any test report ever disclosed the first aspects?
(The cordage usually IS described.)

So, my point is to try to awaken people to be critical of
information rather than so accepting of it ; we need to
gain better information vs. propagating the easy nothing.

All good points. Lots of work to be had, in order to get it right.

alpineer

[Semperviren]

@SS369 post:24

It has the advantage, should you not have prusik cord, of being a grip and slide hitch that works with the same diameter as the parent rope.

It depends on the type of rope you use. I’ve used the blakes hitch with 11.2 mm dynamic line, and it had a tendency to slip. I’ve heard 9mm PMI ezbend is great for blakes, but i’ve never tried it myself.

[SS369]

Hi Semperviren and welcome.

Yes I am sure it can depend on the rope used. I suspect that some static ropes are just too hard and stiff for the Blake’s hitch. Then the rope or cord used can influence all knotting and the decisions to make concerning the task at hand.

Can you tell me the brand of dynamic 11.2mm rope you tried this with?

I suspect that this hitch, the Prohaska/Blake’s will work with more ropes than not. Tree surgeons and recreational tree climbers use many brands of rope and this method of ascending is widely employed.

The Blake’s?Prohaska grip and slide hitch is not what the OP asked about, but I threw it in to expand his database.

SS

[Dan_Lehman]

@Semperviren post:26

@SS369 post:24

It has the advantage, should you not have prusik cord, of being a grip and slide hitch that works with the same diameter as the parent rope.

It depends on the type of rope you use. I’ve used the blake’s hitch with 11.2 mm dynamic line, and it had a tendency to slip. I’ve heard 9mm PMI ezbend is great for blakes, but i’ve never tried it myself.

One shouldn’t consider the knot to be set in stone
re its structure --i.e., one can vary the number of
wraps in it. Heinz Prohaska, (one of) its inventor(s),
gives the following advice:

If the knot slips because the rope is too stiff,
make an extra turn on the half with the tail tucked;
if it slips because the line is too slippery, make an extra
tuck at the other end (which wraps only the object line)

I.e., there might be redress to the slippage you encountered;
I’d recommend adding the turn at the part of the knot wrapping
its tail. (And one could add two extra turns (but at some point,
extra becomes excessive).)

–dl*