Figure 8 V's splice

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startersplice

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Check this out!
Is this crap info or what?
Allways thought splice was way stronger than knots?

Marlow Arborist Ropes

are designed as a general purpose tree surgery rope. It is to be used in combination with ascending, descending and safely devices for work positioning only and not as a fall arrest system. It is designed for use in normal climatic conditions. Before undertaking and during a tree surgery operation, consideration should be given about how the action could be safely and efficiently carried out. In particular, case should be taken in selection of the anchor regarding its possible failure under load.


Marlow ropes
Gecko arborist climbing rope

Ave. Static strength
ex Terminations: 29.9 kN
Ave. Static strength Fig 8 loop: 20.9 kN
Ave. Static strength Spliced: 20.6 kN
Core / Cover: 28% / 72%
 
In some cases, splices simply can't be "way stronger", as the knotted
strength can be so high--say, 80% or more. But, goodness, in your
quoted values, the splice is roughly 2/3 tensile, which seems way low!?
A simple typo-transposition of the splice digits could get '26.0', e.g.!?

Checking source, I see they give slightly different values than your quote:
20.7 spliced; and also
24.9 kN sewn.
(They show photos of each; alas, no photo of the knot's orientation.)

72% cover: is the splice largely tossing the core, and then it's a matter
of some inevitable reduction to the 72% cover that so lessens the strength?

Nick, ... ?!

*kN*
 
16 strand rope, as we know, has most of it's strength in the cover. I would not attribute this loss to the core. The core is "accounted for" in the splice. The cover becomes the core.

Can you guys throw up a link for us to follow along?

The 16 strand splice is one designed for function, not strength. You need a smooth transition from cover tail to core. If it's not smooth, the hitch will lock up at the hourglass or bump.

Still, 70 something percent seems really low.

love
nick
 
leave the marlow splicing guides well alone. to use their guides it helps if you can splice rope in teh first place. for commercial (shipping)splicers i've heard that tehy won't touch European ropes and prefer to stick to samson.

Jamie
 
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