knotless rigging

Yes, we have been using knotless rigging for a long time now.
We have 1/2,5/8 and 3/4 rigging lines the first and last are spliced and we use 70kn & 50kn biners. Also use loop runners and Tuflex slings . Anytime we get to a spot where the spliced eye are biners might be a problem we just have the groundy switch ends on the rigging line. I really can't imagin doing it any other way now.
 
I don't know, usin' a biner and slings may work for limited applications,but from my point of view there is 2 flaws with it. 1; girth hitched slings have to stay "loaded" from the time they're set till they're landed or they tend to migrate, 2; what happens when someone forgets to lock the biner's gate (50-70 kn usually are screw gate)? maybe nothing maybe the sling rolls out. You really can't forget to tie a knot!
 
Has anyone read The Art & Science of Practical Rigging ?

Girth hitching cuts your breaking strength in half while basket hitches double it. Why not basket hitch all the time? I understand it would take a little more forethought as to which sling would fit where, but worth the peace of mind that you are not under rigged, right?
 
Are you guys using 22kN Dyneema slings? If so, then the breaking strength in pounds is 4945. We'll round up to 500lbs for fun!
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Now girth hitch that and take away 2500lbs. Your WLL (working load limit) is 10% of your breaking strength at 250lbs.--Not much for every time you do a removal.

If you used a basket hitch watch how this changes things greatly. Take your 5000lb sling and double it to 10,000lbs. Now take your 10% for your WLL and you get your 1000lbs of "peace of mind."
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I can understand small rigging applications no problem with girth hitching.

How much is your limit when using this system?
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A "basket hitch" would be tough to use on a limb with no laterals. I did read it and when I attended an Arbormaster class dealing with rigging, Sean Gear did a wonderful job of teaching it. Girth 90 percent, basket 10.
 
hi guys
when we use a spliced rope for connecting to the branches we use a rope biner...
it's a carrbiner made with rope...is very strong and it works good with any kind of angle and it don't get damage from schock
 
A girth hitch typically reduces strength by 20%, not 50%.

A loopie still uses a girth hitch, and would be alot to deal with for the climber over say 3/8".

I use 1" nylon slings, tied with a beer knot. Its rated to 4k per leg, so a loop would be 8k muinus the beer knot, which I belive is around 20%, leaving us around 6400k. Then take a girth hitch which removes another 20% in theory, which take lowers the sling to roughly 5k lbs, or 500lb working load, depending on how you rate the slings in a given application.

a 500lb limb I would normally tie a bowline around and send down, its alot to deal with on the ground!
 
soon as possible I post a picture...I show one time to MArk
he can explain you ...
the rope link it's a little dynema ring that you can open and close.....you can use in stead of the iron or steel carrabiner....
 
What Stefano is talking about is a type of loopie that has a knob spliced into the end. You slip the loop over the item you would clip the krab to, then pull the loop tight over the knob. The knob keeps the loop from slipping out. Just like the plastic knobs on a shock cord they use in yachting. I will find a pic.
 
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