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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Double or single lifelines?
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Thread: Double or single lifelines? Reply to Thread
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Topic Review (Newest First)
02-21-2013 10:59 PM
zz4gta
Re: Double or single lifelines?

My point is, the stanchions will fail before the line does.
02-21-2013 11:44 AM
TakeFive
Re: Double or single lifelines?

Quote:
Originally Posted by zz4gta View Post
...I can tell you that you probably won't need to worry about it breaking. The stanchions will absorb a lot of the shock load. I just splice mine to the ring on the pullpits or lash them there. I'm using 1/4" line which works really well. 8600 lbs breaking strength is a little much and I'll probably drop it to 3/16 when I replace it. But the stuff is cheap and easy to splice, it's not like it takes 1/2 a day to change them out, or longer like it would w/ steel....
8600 lb is probably more than needed, but before you go with 3/16" line remember that the tension on the line will be waaaay more than your body weight. You need to do the geometry here:


Also remember that the rated strength is for new line. As soon as it gets UV, weather, and chafe at the contact points, your actual tensile strength goes down.
02-21-2013 10:34 AM
zz4gta
Re: Double or single lifelines?

Yes, any line of any material is weakened if it's bent around a radius smaller than what is recommended. For instance, most rope manufacturers suggest an 8:1 ratio. So for 1/4" line you need a 2" sheave, thimble, whatever. I can tell you that you probably won't need to worry about it breaking. The stanchions will absorb a lot of the shock load. I just splice mine to the ring on the pullpits or lash them there. I'm using 1/4" line which works really well. 8600 lbs breaking strength is a little much and I'll probably drop it to 3/16 when I replace it. But the stuff is cheap and easy to splice, it's not like it takes 1/2 a day to change them out, or longer like it would w/ steel.

I use spiderline for lashing. Dyneema core with poly cover. You can use "Lash-it" as well, but it's more expensive and doesn't hold knots as well. I would change out the lashing every year as cheap insurance. A mini spool is only $16.
02-20-2013 12:21 PM
PaulinVictoria
Re: Double or single lifelines?

That might work. I guess I am not giving amsteel the credit it deserves. I seem to recall reading something a while back about the spliced eyes needing to be a certain size in order to not reduce the strength of the line (it was significantly weakened going around a small radius turn), is that still the case? If so then I guess I could just use a thimble.
Any suggestions for line for the lashings?
02-20-2013 11:43 AM
zz4gta
Re: Double or single lifelines?

So you have something like this


Attached to something like this but with just one 'tang'.


You could use a shackle as a cheap solution. 2.50 ea.


Or you could probably get away with using a sailmakers thimble depending on what size line you wanted. Might get you down to $1.50 ea. if you shop around. I think at that point your splitting hairs though.

Consult a rigger, they'll be able to help you. Lots of solutions to this. As for the zigzag line, no worries. I'm using spiderline as my 'netting' and dyneema lifelines, no real chafe to speak of. 3 years going. I have replaced the spiderline though. This boat is raced hard, had one crew (200 lbs 6'-2") hit them full force, driving a stanchion on the pullpit into and through the deck. But the lifeline and lashing held just fine.

Sails get lashed down, people hang on them, tie fenders to them, etc. They hold up a lot better than you think.
02-20-2013 10:33 AM
c. breeze
Re: Double or single lifelines?

Quote:
Originally Posted by PaulinVictoria View Post
No kids, no racing, if that makes any difference The other alternative was to do away with them entirely, they are next to useless now and mostly just act as a way to trip me up getting on and off at the dock.
slick clean decks are where its at. LIfelines aren't anything to trust your life to, all i ever used them for was making getting in and out of the dink harder than it need be when I was trying to get in and out other than at a gate. Jack lines and harness are what keep you on in or attached to the boat...

I'm singlehanded usually, and as such, theres not anyone whose gonna help me back in the boat- I still prefer going without however- except at anchor- when i sortof think of them as a way to repel boarders... basically if the gate is open, come on up- if not- enter at your own risk. haha totally ineffective but a nice psychological boost either way. Go with your heart on this one- if your scared of going overboard it wont be very fun sailing
02-20-2013 10:01 AM
smallboatlover
Re: Double or single lifelines?

Right now i have single life lines but when i replace the top one i plan on adding a lower one not for holding on but more for tieing stuff up and securing it on deck.
02-20-2013 01:59 AM
chef2sail
Re: Double or single lifelines?

Very similar to ours with the stanchions on the toe rails. Great for room going forward and not worring about soft spots in the decks where the bases are. Hell for docking and the pilings above the dock

I have great confidence in replcing my wire to rope halyards with all rope. I dont have the same with lifelines which are subject to constant sun and wet waves as lasting as long. I have seen a fishook in a bare wire lifeline scissor a joib in two seconds.

The difference in price is not that much. Both will give you the safty you want.

Decide which looks better and which you can adjust the easiest as you will need to do that.
02-20-2013 01:41 AM
PaulinVictoria
Re: Double or single lifelines?

Maybe this will work better...http://i181.photobucket.com/albums/x...K/P1010966.jpg

Not set on wire, my first thought actually was to go to a line system but when I priced up all the bits there wasn't much in it. I can't just lash to a nice eye fitting on my push/pulpits as there isn't one, hence fittings of some sort whichever way I go. I also have a ^^^^^ thing around my lifelines along the foredeck to keep my foresail onboard, that isn't going to work with line lifelines without extra chafe protection (or is it?).
I'm looking for good feedback on either route, I just want to make sure I go the best one
02-19-2013 05:07 PM
zz4gta
Re: Double or single lifelines?

All I get is a red X.

Johnson makes hardware, did they spcify why it should be replaced every 3 years? Synthetic line has come a long way since SK60 was introduced. They coat the lines with a UV blocker and it holds up very well in sunlight. I would suggest every 5 years unless there's chafe issues, and that's only b/c there hasn't been more data available.

By the time you add in your gate and other fittings for wire, you'll still be cheaper using synthetic. More importantly, it's easier, and faster to make repairs, not to mention lighter.

But it sounds like you're set on wire. For me, I'll never put wire lifelines on a boat again. Just not worth it. The catamaran I did we put in pelican hooks and other fittings to drop both sets of lifelines.
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