How to finish off a dyneema lashing?

[prv]

I've fitted a new block at the foot of my mast, to take reefing lines back to the cockpit. Because I needed to locate it quite precisely to get a good lead, there was no combination of shackles or other steel fittings that would fit. But a lashing in 2mm braided dyneema has done the job nicely.

I finished the lashing with several half-hitches around the turns, same as I would with normal polyester cord. However, due to the well-known slipperiness of dyneema, these don't hold - if I pull from "upstream" of the hitches I can watch the whole lot slowly pulling through.

I take it there is some cunning method of finishing a lashing known to the dyneemists out there? I've hitherto been more the canvas, grease, marline and black varnish type

Pete

 

[jdc]

I like and use Harken Tri-Lite blocks which use 2 or 3mm dynemma lashings, see http://www.harken.co.uk/uploadedfiles/Product_Support/PDF/4927.pdf.

A figure of 8 through a hole seems to be the approved method!

 

[Cloven]

I always use a double fishermans knot in similar circumstances. Learnt from rock climbing days for making a non slipping sling form either rope or tape on which you have to trust your life. Never tried it in Dyneema but worth a try.

http://www.animatedknots.com/double...ge=LogoGrog.jpg&Website=www.animatedknots.com

 

[alahol2]

Can you not replace the 'lashing' with a soft shackle?

 

[prv]

A figure of 8 through a hole seems to be the approved method!

Ta. I guess I could tie a figure-8 in the end after the last half-hitch. As long as the fig-8 itself doesn't slip, that would stop it pulling back.

Pete

 

[jac]

Can you not replace the 'lashing' with a soft shackle?

+ 1

I have decided that is the way I'll go. I want to be able to take a spinnaker halyard back to a primary winch so that SWMBO can winch me onboard if I go over. IN full wet gear and mid layers ( soaked) I think that's about 20 stone she'll need to lift so need something robust!

 

[nemodreams]

I always use a double fishermans knot in similar circumstances. Learnt from rock climbing days for making a non slipping sling form either rope or tape on which you have to trust your life. Never tried it in Dyneema but worth a try.

http://www.animatedknots.com/double...ge=LogoGrog.jpg&Website=www.animatedknots.com

We always used what we called a 'tape knot' for tape - and a double fishermans for rope. I see on that link page its listed to as a 'water knot'. Very good knot for tape.

 

[prv]

Can you not replace the 'lashing' with a soft shackle?

Not in this situation, no.

Pete

 

[charles_reed]

Pete,
Immediately after the half hitches, put in a figure of 8 knot.
I use dyneema extensively - not only for harken blocks (which have a cunning hole through which to lead the dyneema) and find this is the simplest way to prevent pull-through.

 

[Cloven]

We always used what we called a 'tape knot' for tape - and a double fishermans for rope. I see on that link page its listed to as a 'water knot'. Very good knot for tape.

You are quite correct. Memory not what it was as those climbing years are long gone. Power to weight ratio all the wrong way round these days!

 

[BabaYaga]

I used a triple fishermans knot in this dyneema lashing, which is the attachment point of an under deck support for an inner forestay fitting (inside the anchor locker).
http://www.ybw.com/forums/images/attach/jpg.gif

 

[micha571]

Here's a how-to by Colligo Marine:
http://www.sv-zanshin.com/manuals/colligolashinglinetiever1_1.pdf