Jacklines, again - Page 4 - SailNet Community
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post #31 of 36 Old 02-28-2009
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Originally Posted by bubb2 View Post
Midlife, I had the occasion to be thrown off a boat several years ago as a result of a collision. It that time I did not a harness on, however it did reinforce to me the need for strong jackline and tethers and harness. You take a 220 pound Man and throw him or have him fall the 6 feet length of a tether you do have some shock loads involved.

Yes, I know that I have strong opinions regarding this subject!
I hear ya'. There is just no way any fall on a boat (short of falling off the mast) is going to generate the shock load of a climber falling 15-20' before the belayer catches them, and I have webbing runners that have taken repeated falls of that distance. When I began climbing, sewn runners were not in common use, and even today I think I'd toss one that took a lead fall, because you don't know what it did to the stitching.

The more we discuss it the more convinced I am that my jacklines will come from the climbing shop at REI and I'll tie in the loops so, won't have to wonder about how good a job someone did of stitching loops.

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post #32 of 36 Old 02-28-2009
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Mid, I don't don't know nothing about no climbing. So if you trust the webbing for climbing, I would agree it would work for jacklines. I agree also that stitched loops being the weak link.

Even though the jacklines I have for my boat do have stitched loops, they have the extra length that I run from bow cleat to the stern cleat and tie then off with cleat hitches. So far no failures!


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post #33 of 36 Old 02-28-2009
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Bubb

I too would not worry about the webbing etc used for climbing. The falls one takes off of rocks, will be worst than a fall/slip from a deck. The main thing here, is making sure you gear is safe, and hopefully will not fail.

For me, it is finding good quality tethers at a reasonable price.

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post #34 of 36 Old 02-28-2009
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Bubb

I too would not worry about the webbing etc used for climbing. The falls one takes off of rocks, will be worst than a fall/slip from a deck. The main thing here, is making sure you gear is safe, and hopefully will not fail.

For me, it is finding good quality tethers at a reasonable price.

Marty
I'm sure that makes sense if you just fall off the deck in normal weather. I just finished the Fastnet book and they described guys being caught in a wave of green water washing over their boat sounding like a freight train and grabbing guys, binnacles and masts and clearing the deck.
So if someone prefers to use a 2" webbing or a spectra core I personally wouldn't argue with them. I've never experienced force 10+ conditions but I'm betting that the force on a jack line in the right conditions could be significantly more than a 15' fall would produce. If you have a half a ton of water in your pocket it has to make a difference.
But for most of us most of the time anything is better than nothing.
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post #35 of 36 Old 03-01-2009
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I'm sure that makes sense if you just fall off the deck in normal weather. I just finished the Fastnet book and they described guys being caught in a wave of green water washing over their boat sounding like a freight train and grabbing guys, binnacles and masts and clearing the deck.
So if someone prefers to use a 2" webbing or a spectra core I personally wouldn't argue with them. I've never experienced force 10+ conditions but I'm betting that the force on a jack line in the right conditions could be significantly more than a 15' fall would produce. If you have a half a ton of water in your pocket it has to make a difference.
But for most of us most of the time anything is better than nothing.
Thinking about my answer later, yes it is possible depending upon the circumstances, that a larger wave washing over a deck, hitting you and you falling could be harder on gear than a rock climber falling say X feet! Not sure what X is, but I would be willing to swag that BOTH sports, could have higher forces than the other, depending upon "what" circumstances you are trying to compare.

With that in mind tho, "WE" as owner operators of our boats, need to know what type of seas, wave action etc we could have as worst conditions in the area we sail. Then if we go to an area with a higher extreme of wave/fall potential, we need to make sure the appropriate gear is up to the task.

So for me in Puget Sound, I would be surprised if one has to worry about the wave factor as compared to say a Volvo 70 or open 60 crew/operator etc in those boats, with speeds in the teens to 20's, even bursts into the 30 knot range, and waves crashing over you. ANy one whom thinks the safety gear for both options needs to be of equal strength to function is probably off base a bit. I could be plenty safe with lighter gear in my worst conditions vs a V70 is their worst conditions.

Like wise climbing, climb a local rock, it is different than climbing Mt Everest. While the gear may look the same, one will need to have appropriate gear for the issues involved.

But for most of use doing coastal cruising, and trying to stay on a boat with lost footing, a lighter wt webbing will probably work just fine, if it has a reasonable breaking strength

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post #36 of 36 Old 03-01-2009
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good point - makes sense after you think about it that way. thanks
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