3 strand nylon lifelines? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 


Like Tree1Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 09-15-2012
MedSailor's Avatar
Closet Powerboater
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 2,563
Thanks: 82
Thanked 54 Times in 46 Posts
Rep Power: 7
MedSailor is on a distinguished road
3 strand nylon lifelines?

I've had a bunch (470 ft) of 1/2 inch nylon 3 strand kicking around in the shed for years and I've been trying to figure out what to do with it.

I was recently contemplating replacing my lifelines and it struck me, why not use 3 strand nylon for my lifelines? That would get rid of a big chunk of the line. I know some people use spectra/dyneema these days and I HAVE seen 3 strand nylon lifelines before but when I did a search here and on google I got very little info back on using 3 strand nylon to make lifelines.

Pros and cons anyone? From my perspective I have the following list of pros/cons:

PROS:
--Stretches when loaded thus adds some dynamic factor to the fall and might be less likely to fail.
--Can be cut in an emergency
--Easy on the hands
--Easier to catch/grip if actually trying to fall/slide overboard
--Repairable with parts at hand
--I got the stuff laying around
--I might finally remember once and for all how to splice when I'm done

Cons (vs uncoated stainless)
--Might be weaker?? Stretch might be bad if I have my physics wrong.
--Chafe on stanchions
--Chafe on poorly led sheets


What does the hive mind think?

MedSailor
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #2  
Old 09-15-2012
Zanshin's Avatar
Senior Member
 
Join Date: Aug 2006
Location: Germany
Posts: 2,165
Thanks: 0
Thanked 14 Times in 14 Posts
Rep Power: 9
Zanshin is on a distinguished road
Re: 3 strand nylon lifelines?

You forgot UV deterioration and I would say that the stretch is a negative. I replaced my lifelines on the previous boat with Dyneema lines (and Brummel Splices) and was happy with that.
There is a reason that the ORC rules stipulate only steel or Dyneema for lifelines and no other material is acceptable.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #3  
Old 09-15-2012
MedSailor's Avatar
Closet Powerboater
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 2,563
Thanks: 82
Thanked 54 Times in 46 Posts
Rep Power: 7
MedSailor is on a distinguished road
Re: 3 strand nylon lifelines?

Quote:
Originally Posted by Zanshin View Post
You forgot UV deterioration and I would say that the stretch is a negative. I replaced my lifelines on the previous boat with Dyneema lines (and Brummel Splices) and was happy with that.
There is a reason that the ORC rules stipulate only steel or Dyneema for lifelines and no other material is acceptable.

How is the stretch a negative? It seems to me that anything that would reduce the multiplied loads at the ends would be a positive, but then again I'm thinking like a climber here....

Do you have a link to any commentary on why they ORC rules stipulate low stretch? I wonder if they just only had one type of line (stainless) and then, once petitioned, allowed Dyneema. I don't think too many racers would have tried 3 strand. It probably seems heavy to them...

MedSailor
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #4  
Old 09-15-2012
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 8,972
Thanks: 10
Thanked 135 Times in 121 Posts
Rep Power: 6
Minnewaska will become famous soon enough Minnewaska will become famous soon enough
Re: 3 strand nylon lifelines?

JMHO, but I think 1/2" line would look funny (too big), then get dirty and look worse.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Reply With Quote Share with Facebook
  #5  
Old 09-15-2012
sailak's Avatar
Crealock 37
 
Join Date: Apr 2007
Location: Alaska
Posts: 488
Thanks: 13
Thanked 14 Times in 14 Posts
Rep Power: 8
sailak is on a distinguished road
Re: 3 strand nylon lifelines?

Quote:
Originally Posted by MedSailor View Post
How is the stretch a negative? It seems to me that anything that would reduce the multiplied loads at the ends would be a positive, but then again I'm thinking like a climber here....
The stretch would be good at reducing loads but I think stretch will also allow you to "fall through" the lifelines if they give way enough. Nylon stretches a lot, I doubt you could get the lifelines tight enough to be useful.
__________________
Dale

S/V Elnora
Pacific Seacraft "Crealock" 37 #312

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #6  
Old 09-15-2012
SlowButSteady's Avatar
Senior Slacker
 
Join Date: Feb 2010
Location: SoCal
Posts: 4,223
Thanks: 0
Thanked 17 Times in 15 Posts
Rep Power: 5
SlowButSteady is on a distinguished road
Re: 3 strand nylon lifelines?

Remember, if a line stretches it also springs back. Falling against a stretchy line might well produce a very difficult to control "rebound", which in turn could both lead to injury and still cause one to go over the side. Probably best to have as stiff a material as possible for lifelines.
__________________
Never forget them. Do something to prevent it from happening again.
Charlotte Bacon, Daniel Barden, Rachel Davino, Olivia Josephine Gay, Ana M. Marquez-Greene, Dylan Hockley, Dawn Hochsprung, Madeleine F. Hsu, Catherine V. Hubbard, Chase Kowalski, Jesse Lewis, James Mattioli , Grace McDonnell, Anne Marie Murphy, Emilie Parker, Jack Pinto, Noah Pozner, Caroline Previdi, Jessica Rekos, Avielle Richman, Lauren Rousseau, Mary Sherlach, Victoria Soto, Benjamin Wheeler, Allison N. Wyatt
Reply With Quote Share with Facebook
  #7  
Old 09-15-2012
pdqaltair's Avatar
Senior Member
 
Join Date: Nov 2008
Location: Deale, MD
Posts: 2,198
Thanks: 1
Thanked 32 Times in 32 Posts
Rep Power: 6
pdqaltair is on a distinguished road
Re: 3 strand nylon lifelines?

Stretch is just a word until you see (or calculate) it in action. I think it would help the OP to tie a length between 2 trees, 2 feet off the ground. Then put your foot on it and take it nearly to the ground.

True, it would be impossible to break a nylon lifeline because of the energy absorption and true it would put less strain on the rest of the system, but It would lack any security when used for balance and it would likely be easier to fall through.

Oversize polyester braid would likely work, but not nylon.

Coincidentally, I have a large pile of retired climbing ropes (8.5-11 mm nylon) and have also found only limited applications.
__________________
(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")

"Well, I just climb up to them."

by Joe Brown, English rock climber




To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #8  
Old 09-15-2012
Zanshin's Avatar
Senior Member
 
Join Date: Aug 2006
Location: Germany
Posts: 2,165
Thanks: 0
Thanked 14 Times in 14 Posts
Rep Power: 9
Zanshin is on a distinguished road
Re: 3 strand nylon lifelines?

Quote:
Originally Posted by MedSailor View Post
How is the stretch a negative?...
MedSailor
I believe too much stretch is a bad thing. Even with steel lines that have no stretch (at typical stresses from a 250Lb body falling overboard and being stopped) the lifelines already have quite a bit of "give" from the stanchions flexing and the endpoints of the line giving a bit as well.

The ORC rule can be found here: ISAF Special Regulations

But I see a new addendum:
Quote:
e) RORC prescription to ISAF OSR: 3.14.6 e) has been deleted, removing the reference to HMPE (Dyneema®/Spectra®)
f) A taut lanyard of synthetic rope may be used to secure lifelines provided the gap it closes does not exceed 100 mm (4 in). This lanyard shall be replaced annually at a minimum.
g) All wire, fittings, anchorage points, fixtures and lanyards shall comprise a lifeline enclosure system which has at all points at least the breaking strength of the required lifeline wire.

TABLE 8
under 8.5 m (28ft) 3 mm (1/8 in)
8.5m - 13 m 4 mm (5/32 in)
over 13 m (43 ft) 5 mm (3/16 in)
So I stand corrected and not even Dyneema is sufficient for offshore racing; just any synthetic for the endpoints.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #9  
Old 09-15-2012
hellosailor's Avatar
Plausible Deniability
 
Join Date: Apr 2006
Posts: 10,629
Thanks: 2
Thanked 89 Times in 87 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
Re: 3 strand nylon lifelines?

Nylon also stretches when wet. Significantly.

So if you plan to use it for lifelines, you want to pre-wet the cord before you string it, and then get it good and snug while it is still wet.

Otherwise, they'll sag during normal use as they pick up splash, spray, or rain.
Reply With Quote Share with Facebook
  #10  
Old 09-15-2012
Senior Member
 
Join Date: Apr 2003
Posts: 4,192
Thanks: 50
Thanked 37 Times in 36 Posts
Rep Power: 14
knothead has a spectacular aura about knothead has a spectacular aura about knothead has a spectacular aura about
Re: 3 strand nylon lifelines?

The only way I could see an application for 1/2" nylon three-strand as a lifeline is if you wanted to rig a temporary chest level line when at sea. Even then, I would rather have something with less stretch.
Use it for docklines, anchor rodes, things for which it was designed. Or else make some salty rope mats.



Splicing won't seem difficult at all after you've tied one of these.
mitiempo likes this.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
3-strand pricing T37SOLARE Gear & Maintenance 5 05-06-2009 08:45 PM
3-Strand Polyester or Nylon trantor12020 Gear & Maintenance 21 01-28-2009 09:30 AM
Can I use uncovered 12 strand for halyards? zz4gta Gear & Maintenance 11 08-14-2008 10:24 AM
Mail's Longhaul in Strand next week (Helderberg) NewsReader News Feeds 0 02-15-2007 04:15 AM
Braiding 8 strand multiplait RoadTool Seamanship & Navigation 3 02-26-2006 01:47 PM


All times are GMT -4. The time now is 12:27 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.