girth hitch whoopie to omni block 2.0

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Leafguy

New member
Just wanted to check in and see if this is acceptable option. It's super tight girth hitch. It's an light used 5/8 whoopie sling. It's either this or I attach the block with a carabiner. Or buy a smaller sling. Trying to save pennies though. This set up will be used for sub 200lbs rigging and re-directs.

Thanks
 

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Leafguy said:
Just wanted to check in and see if this is acceptable option. It's super tight girth hitch. It's an light used 5/8 whoopie sling. It's either this or I attach the block with a carabiner. Or buy a smaller sling. Trying to save pennies though. This set up will be used for sub 200lbs rigging and re-directs.

Thanks
Click to expand...


Good question - I've been using webbing slings on mine but always wondered as well. It hasn't been an issue yet, but I've wondered if the force could cut through a girth-hitched sling.

You probably already know this, but I don't mix my rigging and life support. Assuming you meant rigging 'redirect'.


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Used strictly for rigging purposes. Putting the omni block on a webbing sling is another option for me. Just happen to have a whoopie sling laying around
 
If you derated that 5/8" hollow braid by 50% for the girth hitch, that sling and pulley would be pretty close to evenly matched.
In other words, if you're smart enough to worry about breaking the pulley... and keep the loads reasonable so that doesn't happen... that sling isn't going to break, either.

Now, if that girth hitch around that fairly square shaped pulley shackle weakens the rope by more than 50% you might have something to worry about. But I really can't see that as being very likely, myself. I use those pulleys for redirects, myself (several of them) and although they're spliced onto 5/8" Tenex-TEC slings, not girth hitched, I have never for a moment worried about whether a 200-lb. stick of wood, even if it fell 20', could break that combination.
 
Good stuff thanks. I'm always pretty conservative in my rigging applications. Just easier on the equipment, crew and headspace.
 
I have a 1.5" omni block that I spliced an ultra sling out of 1/4 inch amsteel (the little silver crap). I always carry it on my saddle and use it for a redirect or quick crotch all the time. Love it.
 
I've made ultraslings out of Amsteel, too. Very lightweight and easy to carry on the saddle. I label them at half the hollowbraid's rating, because (as @bonner1040 pointed out to me) the self-abrasion of these fibers makes it necessary to de-rate the sling. With the polyester hollowbraids, the sling is as strong as the rope you use. I have a couple that I use to anchor a long lanyard, or to make a quick MA for limbwalking, but I don't use them on my primary climb line. For light rigging, though, the low weight and bulk makes them pretty nice for redirects, as you said. They're also terribly easy to make!
 
I've been wondering about that. I made an Amsteel pocket sling, too, and have recently been thinking more and more about its SWL due to the self-abrasion factor. I was using mine for climbing redirects, but will be switching to 3/8" poly for that application.
 
From what I can see on one of the small ultraslings that I made out of Samson Icetail (Technora) that gets used a lot for all kinds of stuff (haul line anchor, hanging a big saw so I can move around without it on my saddle, light rigging redirect, etc.) the problem isn't with the brummel used for the end splice. When you choke the sling off, it puts a lot of pressure on the interconnecting brummels where the sling passes through the adjustment eye you're using. I'm basing this on physical observation of the sling. It was my test piece, so I abuse the hell out of it to see for myself what's likely to go wrong. I even use it for an attachment point when I'm leaving a thick hinge on a branch, then coming down and pulling it off the tree. Anyway, the wear on the sling... where it shows the most fiber crushing, fuzzing and softening up... is where the sling passes through the "crotch" of the eyes being used the most to make it fit the limb. The first eye up from the end splice doesn't get used much, and it shows none of this wear.

So, if I had to guess, I'd say that the pressure applied to those spaced brummels forming the eyes (and always the "corner" toward the end splice or load) are crushing fibers pretty bad. There doesn't seem to be this kind of wear with the brummel forming the end splice, so I'd guess that a deadeye sling wouldn't be a problem. Maybe Nick can offer a better opinion, because I've never actually tried to break one of these, yet. I think it would be fair to say that a brummel in general is going to cause some self abrasion, but with an end eye splice I don't think it would be anywhere near the kind of friction and damage that the ultrasling construction seems to cause.

I guess you'd have to break test some of each, before you could really assess the risk.
 
JeffGu said:
From what I can see on one of the small ultraslings that I made out of Samson Icetail (Technora) that gets used a lot for all kinds of stuff (haul line anchor, hanging a big saw so I can move around without it on my saddle, light rigging redirect, etc.) the problem isn't with the brummel used for the end splice. When you choke the sling off, it puts a lot of pressure on the interconnecting brummels where the sling passes through the adjustment eye you're using. I'm basing this on physical observation of the sling. It was my test piece, so I abuse the hell out of it to see for myself what's likely to go wrong. I even use it for an attachment point when I'm leaving a thick hinge on a branch, then coming down and pulling it off the tree. Anyway, the wear on the sling... where it shows the most fiber crushing, fuzzing and softening up... is where the sling passes through the "crotch" of the eyes being used the most to make it fit the limb. The first eye up from the end splice doesn't get used much, and it shows none of this wear.

So, if I had to guess, I'd say that the pressure applied to those spaced brummels forming the eyes (and always the "corner" toward the end splice or load) are crushing fibers pretty bad. There doesn't seem to be this kind of wear with the brummel forming the end splice, so I'd guess that a deadeye sling wouldn't be a problem. Maybe Nick can offer a better opinion, because I've never actually tried to break one of these, yet. I think it would be fair to say that a brummel in general is going to cause some self abrasion, but with an end eye splice I don't think it would be anywhere near the kind of friction and damage that the ultrasling construction seems to cause.

I guess you'd have to break test some of each, before you could really assess the risk.
Click to expand...
I'm not concerned about it honestly. I constantly update and inspect my equipment. I will not hesitate to replace something I find questionable.
 
Simpleiowaguy said:
Could go with 3/8 or 7/ 16 trex in the future.
Click to expand...

Yeah, I got some 3/8" Tenex-TEC and Nerex and made some. Not much heavier feeling than the Amsteel, and still plenty strong.
Nick warned me about this, and he was right... I think an ultrasling out of these fibers has to be treated with a lot of caution. I haven't broken one, yet, but I'm convinced it might not be a good idea to use them for life support, or mission critical rigging. You need to keep a close eye on them, for sure.

Also, the weight savings isn't enough motivation to continue making them, compared to the cost. If the sling can't take advantage of the strength-to-weight ratio that these fibers offer, then I've lost interest in spending more money for something I have to derate so much.

I still love the little Icetail one, though... I just won't use it where things can go bad. And, stop posting while I'm still typing, @Simpleiowaguy! :risas:
 
I have no idea. I have only a little bit of splicing experience. There's so many people on here who have spliced everything from their shoelaces to crane cables that somebody is bound to know! I do, sometimes, try stuff out on unsuspecting guinea pigs. But, I always make sure they're small enough that I can drag the body off into the bushes before anybody notices me picking up little bits of badly spliced rope.
 
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