Soft shackles a good idea? - Page 3 - SailNet Community
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post #21 of 61 Old 01-28-2011
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Adam, I've used these for light air spin shackles and they work well. I flogged the sail on purpose for a while just to see if they'll hold. They did. I think if they're made correctly, they'll hold very well. I have had old snap shackles let go, interestingly enough.

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post #22 of 61 Old 01-28-2011
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Good to hear. I am thinking of picking up a few feet of dyneema today and putting one or two together over the weekend. Will be a fun project either way!

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post #23 of 61 Old 01-29-2011
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I made two soft shackles last night! I followed the Colligo Marine video. With the first one, the center section was too short, so you couldn't make the loop big enough to go over the knot. Also it took forever to do.

Second one was measured out much better. I left the tails on so I could work the knot a little tighter by hand before trying it out... someplace. It took less than 30 minutes, mostly because I got caught up passing the end through (fids are on the boat) and had to start over.




It's 3/16-in single braid dyneema. This is from a 36-in piece. Cost $2.97 at WM. The dye seems to come out really easily.

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post #24 of 61 Old 01-31-2011
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Yeah, the gray/silver seems to be the natural color.

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post #25 of 61 Old 01-31-2011
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I've been using the plain silver colour with no problems.

AdamLein, it seems to me that making them too short is a common enough problem. Even my later attempts are bit tight. I'm intending to get hold of some more Dyeema and having another go.

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― Terry Pratchett.
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post #26 of 61 Old 01-31-2011
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For what it's worth, having short shackles means you don't get two-blocked as quickly.. though that's not always terribly important

... or I'm wrong.

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post #27 of 61 Old 01-31-2011
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Quote:
Originally Posted by tdw View Post
AdamLein, it seems to me that making them too short is a common enough problem. Even my later attempts are bit tight. I'm intending to get hold of some more Dyeema and having another go.
I was being cheap with Dyneema on my first attempt. The video uses a 36-in piece and puts marks at 12 and 17 inches, and then cut off about eight inches worth of tails and threw it away. I used 21 inches and put marks at, iirc, 7 and 11 inches.

So my lesson is that a 3/16-inch line needs 5 inches between the marks to fit the knot through the resulting loop. Could probably do with less. The position of the 12 inch mark, I think, doesn't make a difference; it just determines how much line you have to tie the knot.

My resulting shackle was quite, I thought, large. It would probably not fit in the headboard of my mainsail, but it should be fine for jib heads and clews. I would hesitate to use it on spinnaker sheets because of chafe in the pole jaws. Anyway, I'll probably get some 1/8-inch gray dyneema and try again with a smaller gap between the marks (thinking 3.25 inches).

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Originally Posted by CapTim
For what it's worth, having short shackles means you don't get two-blocked as quickly.
I've heard of this issue but don't really know why it's a bad thing. Are you worried about the shackle jamming in the sheave?

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post #28 of 61 Old 02-01-2011
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Nah, but if you are trying to tighten, say, a guy pole or a tack line or any handy-billy, you can't tighten things past the point where two shackles touch. So if your shackels are quite long, you might end up not being able to tension things as much as you like. It's more of a racer thing, and I'm not a racer.. but I know a lot of racer types who like to have short shackles for that reason

... or I'm wrong.

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post #29 of 61 Old 03-06-2011
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If you make them like the video, they are too short to fit around a pair of jib sheets. I think the ones in the video must be for replacing jib hanks where they are just going around a forestay and a bolt rope. I made a calculator for calculating the length of line and the various markers that might be of interest. It is opposite the second picture on this site Soft Shackles

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post #30 of 61 Old 03-06-2011
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I posted this once before on a different forum, but here it is again.This is what I use for head-sail shackles. It's permany tied in to the sheets, quick for head sail changes, and light weight.
Soft shackles a good idea?-sheet1.jpg

Soft shackles a good idea?-sheet2.jpg

Soft shackles a good idea?-sheet3.jpg
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