whoopie sling questions

luke capa

luke capa

Location
boulder
When making a whoopie sling is there a reason that the standard is an adjustable eye rather than a fixed eye size and an adjustable length? will the sling be compromised if not made in the traditional style with an adjustable eye?
 
im trying to understand why this would compromise it would it break at the bury? what do you mean the strength of a single rope? the sling would be setup in a choker configuration with the black pulley going through the blue fixed eye
 
Technically, it would work, but why would you want 2 fixed eyes for a Block? If overloaded the capturing eye can be drawn into the path of the rigging rope, thus causing rope on rope friction. Don't get me wrong, the concept, I'm sure has been used, but I wouldn't want to be the ground i.e. If that scenario occurred, nor would I want to be anywhere near the rigging rope(if that's what you're trying to implement here) due to slippage or failure. It's not a Bad idea, but, it seems to me, to be a less than optimal concept, to using 1 loop of rope. What you've drawn are 2 dead eye slings that dependent upon one another. My question would be, what situation would warrant such a setup, is it that you only have 2 shorts that you want to incorporate into a working configuration? Or, are you just wanting to experiment for the sake of will it work? I personally don't see this being anything more than a hazard waiting to happen, and if it's overloaded, it will happen! Sorry, but this is just my opinion, take it for what it's worth, but I doubt you'll have enough for a cup of coffee. Best of luck to you, & your experiment.
 
would the rope on rope friction be any different than a standard whoopie sling? other than the fact that the friction will be on the same piece of rope every time, would a piece of cordura over the adjustable dead eye fix the problem?
 
The large loop of the whoopie is essentially in basket mode in regards to the splice (section where the rope is buried into itself, not the fixed eye brummel splice). The forces trying to pull the rope through itself are shared by two legs of the loop, and are halved. They are further reduced by the greater friction area (with the tree) of the two legs. This makes it harder for the forces to loosen up the adjustable eye of the sling. In your configuration, all of the applied forces, minus the friction reduction from a single leg of the rope are pulling the adjustment open. Additionally, in a whoopie the pulling force is working against itself (moving leg is pulling against the leg with the fixed eye hooked to the block) which causes more friction within the splice than your configuration, where the forces are pulling both legs away from each other. Although this movement will still try to tighten down on one leg (in this case, separate pieces of rope), it will have to overcome much greater forces trying to pull it apart. It will most likely pull apart with very low forces compared to the whoopie sling.

Without stopper knots in the ends of the two pieces, the ends will pull through the splice in this configuration.
 
I'm speaking of the lowering rope, not the sling rope. If the sling was to slip, so as to get down in the path of your rigging block, then you would allow the fixed eye to drop down over your rigging block, this is where I'd be concerned about rope on rope contact. If you refer to your drawing, the blue loop could come in contact with your rigging line.
 
You must log in or register to reply here.

New threads New posts

Kask Stihl NORTHEASTERN Arborists Wesspur TreeStuff.com Teufelberger Westminster X-Rigging Teufelberger
Back
Top Bottom