Lenght on the white loop on 3 rings?

[Hellis 0]

If you lenghten the loop holding the 3 rings will that make any difference on pullforce to cutaway?
I'm guessing a longer loop will make it slightly harder to cutaway because it will shift some of the load from the rings to the loop.
Is that correct?

The loop is currently so thight you can't use the metalloop of the housing.
My plan is to replace the loop with a longer loop.

The risers will not be used in skydiving again.

[skydiverek 63]

It depends how long. The optimum and not optimum scenario is shown in the attached four files. There was also PDF file "3 ring construction manual.pdf" on the Internet, but I cannot find it now...

[Quagmirian 40]

1 5/8" for the mini ring set and 2 3/8" for the standard ring set apparently. Here's the manual if you want it

[Hellis 0]

Thank you both very much.

My plan is to basicly lenghten it to a few mm more than what a new pair of risers is.
The riser due for modification is very old and I believe, if I recall correct, risers lenghten by time and the distance between the rings get longer thus the loop seems to shorten.

The plan is to have room for two cutaway cables in the loop.

[Hellis 0]

Does the placement of the "free ends" of the loop make any difference?

The current loop is placed where they normally sit, but instead of ripping up the seams and removing the old loop, can I just cut the loop of an stitch the new loop higher up on the riser (closer to liks).

[theonlyski 8]

Hellis

Does the placement of the "free ends" of the loop make any difference?

The current loop is placed where they normally sit, but instead of ripping up the seams and removing the old loop, can I just cut the loop of an stitch the new loop higher up on the riser (closer to liks).

While that's somewhat sloppy rigging, it shouldn't be much of an issue. Since these aren't to be used for jumping, what are they going to get used for?

Make sure you hot-knife or otherwise terminate the ends of the II-A line or you'll be replacing it again very soon.

"I may be a dirty pirate hooker...but I'm not about to go stand on the corner." iluvtofly
DPH -7, TDS 578, Muff 5153, SCR 14890
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[Hellis 0]

I thought of that too, it won't look very nice.
So I will rip the seams and see what's under it.

It can't be worse than ripping my own seams

[Hellis 0]

Not perfect but OK.

It was though going trough all those layers..

[riggerrob 643]

Sounds like you are starting with a set of very old risers ... sewn before 3-Ring Inc. published their manual in 1998. The white loop should always have a bit of slack. The slack allows it to act like a pulley, halving the load on the yellow cable. This "halving" effect is an important part of 3-Ring geometry.

[Hellis 0]

I believe you are correct.
The risers are old and are not built to 1998 specs.

When I removed the confulence wrap, the stitching holding the loop was not "correct".
Looking at my picture, the seams was straightstitches from left to right, and I would guess only 20-25 of them was on the loop, the rest was in the area around it.

[riggerrob 643]

The white loop is supposed to be sewn to the riser with bar-tacks or plenty of zig-zag.
That structural stitching is usually hidden under the confluence wrap. If the structural stitching is not inspected ... it might be missed ... see a couple of Service Bulletins issued by Rigging Innovations.
To see the stitch pattern, look at a Service Bulletin on Sigma main risers.