The scrap yard may be calling for your delta link

[MNFarmHunter]

I did some testing because I'm a data nerd. The testing used the same piece of oplux rope.

Finished length:
Rope (no knots) = 109" or 9' 1"
Triple fishermans w/ overhand = 96" or 8'
Figure 8 on a bight w/ double fishermans safety = 71" or 5' 11"

Just on length alone, there are advantages as you use over 2 feet less rope with this over a figure 8. That'll save you a few bucks per tether but also makes for a more compact kit, especially with larger diameter ropes.

Speed and cleanliness:
Negligible. Tying an overhand or cow hitch is about as quick as feeding the tag end through the bight. Some advantage may go to this over the figure 8 as you can keep you rope off the ground easier.

Wear:
It occurred to me last night that on my tethers last season, I tied the figure 8 and left it alone. In effect, I used it the same as a sewn eye. However, both tethers have developed a flat area right at the pinch point because no matter the tree diameter, that spot will always take 100% of the directional load. Once massaged, the sheath and core still feel good but it's a data point.

With this method, tying the overhand or cow hitch every time will change the stress points in the rope and should in theory make for a safer and longer lasting rope. The triple fishermans wouldn't be retied but due to it's limited stresses (it's just there as a safety), that shouldn't matter.

 

[Red Beard]

I did some testing because I'm a data nerd. The testing used the same piece of oplux rope.

Finished length:
Rope (no knots) = 109" or 9' 1"
Triple fishermans w/ overhand = 96" or 8'
Figure 8 on a bight w/ double fishermans safety = 71" or 5' 11"

Just on length alone, there are advantages as you use over 2 feet less rope with this over a figure 8. That'll save you a few bucks per tether but also makes for a more compact kit, especially with larger diameter ropes.

Speed and cleanliness:
Negligible. Tying an overhand or cow hitch is about as quick as feeding the tag end through the bight. Some advantage may go to this over the figure 8 as you can keep you rope off the ground easier.

Wear:
It occurred to me last night that on my tethers last season, I tied the figure 8 and left it alone. In effect, I used it the same as a sewn eye. However, both tethers have developed a flat area right at the pinch point because no matter the tree diameter, that spot will always take 100% of the directional load. Once massaged, the sheath and core still feel good but it's a data point.

With this method, tying the overhand or cow hitch every time will change the stress points in the rope and should in theory make for a safer and longer lasting rope. The triple fishermans wouldn't be retied but due to it's limited stresses (it's just there as a safety), that shouldn't matter.

This is all good info. Thank you!

 

[MNFarmHunter]

Use:
For this testing, I used oplux (8mm) and some no-name 11mm rope. Each rope was then tied with a cow hitch and overhand knot. Finally, a foot loop was rigged and I bounced in the foot loop several times to cinch the knot down tightly. This was probably extreme but I was looking for the worst case scenario.

For both ropes, the cow hitch cinched down tighter that the overhand knot. This made advancing the rope, such as when used by 2TC or 1-stick, much more difficult compared to the overhand. Conversely, the cow hitch was much easier to break and untie compared to the overhand.

 

[phatkaw]

Just got back in from finally trying this.
I have this one tether that I hate because it's soo dang stiff it always falls back down and I figured this might work well.?
Not that great... it took me 45 minutes worth of replaying @Red Beard s video and trying to convert it to Right Handed. Hahaha
Once I got it kinda figured out each time I set the tether it tightened up a little more and more towards the barrel knot and after a few or more advances it'd be at the barrel knot and a pain to undo!
Now I gotta go out and try the 'new' Cow Hitch version...

See yins later.

 

[tailgunner]

Did this in the dark this morning.no deer.flawless first try thogh

 

[MNFarmHunter]

2TC climbing but can also be used for 1-stick tether.

Using (2) oplux ropes, I tied my tether using the cow hitch and the foot loop using the overhand. I didn't do anything outrageous, just climbed 15' then climbed down. As expected, the cow hitch cinched up tight almost immediately. While it could still be loosened and moved, it was noticeably more difficult than the the overhand. The overhand stayed taut but didn't cinch down as tight as when I bounced on it. Once on the ground, both knots were about equal in breaking and untying. Again, the overhand was much easier to untie compared to when I bounced on it. This tells me that under normal use, the overhand won't cinch down any tighter than the cow hitch.

Having the fishermans knot to grab did make it easier to move with 2TC and setup was easier compared to a fixed loop as you're using less rope to girth hitch.

 

[Wirrex]

@Redbeard - redsquirrel beat me to it - what is your perceived advantage over just making a girth hitch using a permanent figure8 knot on a bite at the end of your tether?

If you were rappelling I would see the advantage of it as elimination of the quick link, but you said you’re no longer rappelling, so what’s the advantage over @redsquirrel’s approach?

Anyone using a full length rope or split tail for teather may like this. In these methods it is not practical to pass everything through a girth hitch. I might experiment with it but it would be hard to beat the ease of the JRB hitch in my full rope system. I could definitely see it working in a split tail when passing limbs!

 

[tailgunner]

Im thinking about a finger Tab to pull the knot loose.i dont have physical time though.

 

[tailgunner]

We meed to move this to the 2tc.workshop page

 

[enkriss]

We meed to move this to the 2tc.workshop page

Why is that it can be used for one a sticking also.

 

[tailgunner]

2 tethers is used in every climbing system except tree branches.every thing els is extra.