Dyneema to Dual Braid Halyard splice

[allene]

The topic of splicing a Dyneema halyard to a dual braid tail at roughly the half way point has been discussed and I was wondering if a splice I am thinking of has been tested or even if it will work. My initial trials suggest it might. The idea would be to pull the core out of the dual braid say 1 foot back, pull the cover back another foot and cut off 1 foot of the core. Then take the core and tuck it inside the Dyneema for a foot. Then milk the dual braid cover back over the core and Dyneema. At this point you have 1 ft of Dyneema between the two braids of the dual braid and a tail of cover 1 ft long hanging out right where the core stops. You would then bury the cover inside the Dyneema for a foot with a taper on the end. Lengths would have to be adjusted to allow for shrinkage from the bury but this is the idea. The biggest problem I see it that I would want to use something like 3/8 double braid and 3/16 Dyneema and that might be near the limit of what can fit inside the 3/16 braid. I think it would be like trying to tuck a 1/4 inch line inside the 3/16 and that seems doable. Anyway, not having a testing jig I hesitate to use such a setup so I was wondering if anyone has tried this.

[Brion Toss]

Hi there,
And first, I commend you on your spirit of inquisitiveness. This is how we progress. I don't exactly follow your idea, but as far as I understand it, it seems unlikely that the splice would work, if only because of bury length. I could well be wrong, but the only way to tell would be to break several samples, and record the results. Similar splices have been tried, including in our shop, with some success. Please follow through on this; even failures can provide valuable data. Or, as the old saying goes, "Good judgement is based on experience, which is based on bad judgement."
Fair leads,
Brion Toss

[allene]

Originally Posted by Brion Toss

Hi there,
And first, I commend you on your spirit of inquisitiveness. This is how we progress. I don't exactly follow your idea, but as far as I understand it, it seems unlikely that the splice would work, if only because of bury length. I could well be wrong, but the only way to tell would be to break several samples, and record the results. Similar splices have been tried, including in our shop, with some success. Please follow through on this; even failures can provide valuable data. Or, as the old saying goes, "Good judgement is based on experience, which is based on bad judgement."
Fair leads,
Brion Toss

Thanks for the reply,

1 foot is 64 diameters of the HM. That is almost 72 diameters :-) Perhaps I should be thinking of 2 ft so that I have that many diameters of the dual braid. Is that what you are thinking?

Just a point of clarification, I have two buries of this length in mind, one for the core and one for the cover and they run head to tail so to speak. So, that would be a total of 2 or 4 feet of the HM that had some of the dual braid inside depending on which diameter I use as the base.

By the way, speaking of testing, I did some testing on some soft shackles made from 1/8" amsteel and tied them together with 3/8 dual braid. I put a straight section of 1/8 in the center with eye splices to serve as a calibration strength. I pulled on them between two cars and unfortunately it broke the 3/8 dual braid and not the 1/8 HM. Search YouTube for "testing soft shackle" Look for the white Sable wagon. It is 18 seconds. Broke right at the bowline. I intend to repeat the test with stronger line tying things together. If I can get one of these halyard splices made, I will test that too.

Allen