Need ABoK No. for slipped double overhand knot (noose)

Chit Chat
1

My fellow knotting enthusiasts,

I need an ABoK number for a ‘slipped double overhand knot’.

It may also be termed a noose.

The double overhand knot is tied around its own Spart so it can be cinched tight back on itself - eg to form a tight connective interface on a climbing carabiner.

This type of knot is popular amongst climbers and rope access workers in forming a lanyard from dynamic rope.

I dont have access to the real ABoK, nor do I have access to an electronic copy (dont even know where to find it).

Thanks in advance.

2

Rushed into local library and found Ashleys book of knots in the reference section…

Turns out its ABoK #409 - Poachers knot

This is a popular connective knot to form a personal safety lanyard. It cinches tight and has a relatively small footprint compared to single loop knots such as ABoK #1047 (F8 loop).

The ability to cinch the knot (noose) tight against a carabiner also makes it resistant to the effects of cyclic loading which can cause carabiners to rotate and be exposed to a cross-loading.

Here is some test results based on 8.0mm diameter cord for those who are interested:

http://www.caves.org/section/vertical/nh/46/doitie.html

agent_smith

3

Yes, the Strangle Noose is a lovely little knot and very strong too, but stronger than the fig 8 ?? That really shook me.

The link you posted, do you know the author?

Derek

4

Why think a loopknot might be stronger? (… , as, with a noose hitch, the SPart runs straight through to wrap the object.)

I thought that for ring (i.e., roughly = material dia.) hitches, the ring would be a determining factor;
apparently this isn’t so, barring small rings–friction of material vs. material seems to be an important weakening.
Noting the failure point in the cited tests, I muse that there are kinder/gentler hitches that could be used
vice the Strangle to form the noose, such as the Anchor Bend or Rolling H., and the strength would be greater!?

There are some puzzling data to ponder in Friction Hitch Compilation (pdf, “96pp” but it seems to come smaller…?),
done for arborist materials by Paulo Bavaresco for HSE: www.treemettlenexus.com/pdfs/FrictionHitchCompilation.pdf

(Among results anomalies: Strangle N beats Fig.8, Fig.8 beats Bwl–but w/failure greater for Bwl than 1st Fig.8.
Bwl failures in some other tests well lower than in the 8 v. Bwl one!? And so on.)

–dl*