Jackstay attachment

radarman

radarman

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13 Nov 2008
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Bothwell, Scotland
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Got some nice new webbing Jackstays made for the boat with loops in each end. Went to the local swinderly to try and get some suitable "D" rings only to find they had no suitable sized ones in stock!!

So got to wondering could I use some Braid on Braid (or maybe Dyneema) to join the webbing loop to the deck ring and if so what thickness? Also what type of knot would be best?

Thoughts?
 
Because Webbbing jackstays suffer from UV degradation which weakens both the webbing and the stitching, I use stainless snap shackles at each end and remove them after each trip. With snap shackles it only takes a couple of minutes to snap them on. I also marked them 'P' and 'S' as they were not exactly the same length. This way they should last several seasons(as long as I remember to remove them sfter each trip!).
 
radarman said:
So got to wondering could I use some Braid on Braid (or maybe Dyneema) to join the webbing loop to the deck ring and if so what thickness? Also what type of knot would be best?
Click to expand...

Yes you can.

The jackstay webbing should have about a 3000kg breaking strength. Your lashing needs to match that. One strand of 6mm regular Dacron double braid has about a 1000kg breaking strength. So, if you took two loops around the deck ring and web loop (so you have four strands connecting them) you would have 4000kg and be great. The strongest connecting knot is the double fisherman, but a sheetbend is the most common and easier to untie. Alternately, you could use a bowline to tie one end to the deck ring and then half hitch it back on itself around the two loops.

You could use 3mm dyneema cord (1000kg) breaking strength) but there no real advantage and it does not hold knots as well.
 
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radarman said:
Got some nice new webbing Jackstays made for the boat with loops in each end. Went to the local swinderly to try and get some suitable "D" rings only to find they had no suitable sized ones in stock!!

So got to wondering could I use some Braid on Braid (or maybe Dyneema) to join the webbing loop to the deck ring and if so what thickness? Also what type of knot would be best?

Thoughts?
Click to expand...

Keep looking - the right sized D rings with screw pins are available - I use them. And you can see immediately they are in good condition - which you cannot say of other webbing type solutions. Note - high spec ropes are not reliable when bent tightly around fixtures because their strength lies in a longitudinal plane.

PWG
 
I would undo the loop at one end. You can then pass one end through the deck ring at the bow and tie the jackstay to the stern ring using a double overhand knot. The jackstay can then be removed easily at the end of the season and adjusted for any stretch. Having sewn in loops both ends does not allow for and stretch. Regarding removing after each outing - I don't think this is necessary in UK where UV degradation is low (specially this summer). I intend to replace my jackstays after five years anyway.
 
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