Question about lifelines - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 38 Old 02-28-2011 Thread Starter
1975 Newport 28
 
jaschrumpf's Avatar
 
Join Date: Jun 2002
Location: Monrovia, MD
Posts: 573
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 14
 
Question about lifelines

Given that stanchions are relatively narrow at their base for their height, what's going to happen when a 200+ pound sailor loses balance and falls against that tall lever? Seems to me that the stanchion is going to come out of the deck no matter how well-bedded it is.

So is the real purpose of the lifeline just to give an overboard sailor something to hang on to? It sure doesn't seem as though it's going to keep him or her on board -- being tethered to a jackline will do that a lot better.

Just a random ponder.

S/V Free Spirit

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

Monrovia, MD
jaschrumpf is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 38 Old 02-28-2011
Senior Member
 
Zanshin's Avatar
 
Join Date: Aug 2006
Location: Germany
Posts: 2,297
Thanks: 0
Thanked 29 Times in 27 Posts
Rep Power: 10
 
look at the following ISAF document and search for "stanchions" to get an idea of what the design specs are. The lifelines are part of the supporting system, so the full 200lb accelerated load won't go straight across one stanchion, and if it does it will deform to absorb the energy but not break, and if it does break there are still 2 lifelines through it that can each hold a multiplie of the forces involved.

http://www2.sailing.org/offshore/200...Mu4_270607.pdf


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.
Zanshin is offline  
Quote Quick Reply Share with Facebook
post #3 of 38 Old 02-28-2011
Senior Member
 
Sabreman's Avatar
 
Join Date: Sep 2006
Location: Yeocomico River, VA
Posts: 1,643
Thanks: 3
Thanked 18 Times in 15 Posts
Rep Power: 10
   
True on all accounts. A lifeline is meant to act as a reminder of where the edge is and as a handhold for walking. They also keep large items on deck (e.g., sails). I recall reading that the criteria is something like 50 lbs of lateral pressure before it fails. Not much.

In reality, a properly through bolted stanchion base will probably hold the weight of a falling crew member, but the stanchion will probably fold over.

The relative fragility of stanchions is why I strongly discourage people attempting to hoist themselves onboard by grabbing the thing. My wife also has a habit of grabbing it to pull the boat in closer to the dock. I cringe when she does that but her name is on the boat, so what can I do?

Sabre 38 "Victoria"
Sabreman is offline  
Quote Quick Reply Share with Facebook
post #4 of 38 Old 02-28-2011
Courtney the Dancer
 
jrd22's Avatar
 
Join Date: Nov 2000
Location: San Juan Islands., WA, USA
Posts: 3,885
Thanks: 4
Thanked 22 Times in 21 Posts
Rep Power: 15
 
The force would be distributed to all of the stanchions by way of the lifelines. If your lifelines are attached to the bow and stern like most boats you might end up with a bent stanchion or two but you're not going to break that SS lifeline (if it's in good shape, no corrosion, etc).

John
SV Laurie Anne

1988 Brewer 40 Pilothouse

jrd22 is offline  
Quote Quick Reply Share with Facebook
post #5 of 38 Old 02-28-2011
Senior Member
 
pdqaltair's Avatar
 
Join Date: Nov 2008
Location: Deale, MD
Posts: 2,604
Thanks: 1
Thanked 53 Times in 53 Posts
Rep Power: 7
 
Quote:
Originally Posted by Sabreman View Post
My wife also has a habit of grabbing it to pull the boat in closer to the dock. I cringe when she does that but her name is on the boat, so what can I do?
Brace the one she grabs? Been there.

Actually, my wife has arthritis and we do make adjustments. I carry a small tackle that I use to pull the boat to the dock and to hold it steady. It goes from cleat to piling/cleat, so there is no strain. In fact, I find it very handy when I'm loading and unloading too. I have been careful to chose a loop for one end that will snap should I forget to release it and the tide changes!

(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.
pdqaltair is offline  
Quote Quick Reply Share with Facebook
post #6 of 38 Old 02-28-2011
Senior Member
 
chef2sail's Avatar
 
Join Date: Nov 2007
Location: Maryland
Posts: 7,099
Thanks: 30
Thanked 58 Times in 54 Posts
Rep Power: 8
 
Send a message via AIM to chef2sail
Our stanchions are connected to the anodized toerail ( an 80s C&C design )thus little to worry about interms of rebedding the deck or having them become wobbly. It is a good design EXCEPT they tend to get hung up on pilings when docking if you are not careful. They will handle the load (since the lifeline is swaged on and adjusted correctly with adjustable barrels) of a 250 lb man easily.

Dave


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
___________________________
S/V Haleakala (Hawaiian for" House of the Sun")
C&C 35 MKIII Hull # 76
Parkville, Maryland
(photos by Joe McCary)
Charter member of the Chesapeake Lion posse

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


“Sailing is just the bottom line, like adding up the score in bridge. My real interest is in the tremendous game of life.”- Dennis Conner

Last edited by chef2sail; 02-28-2011 at 06:40 PM.
chef2sail is offline  
Quote Quick Reply Share with Facebook
post #7 of 38 Old 02-28-2011
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
Lifelines are just a reminder that you're about to go overboard. In many cases, you can't rely on them to keep you aboard, especially if they're coated with vinyl, since the stainless steel may be corroded badly beneath with no real visible signs of it. Also, on many boats, the stanchions aren't tall enough to prevent a taller person from going overboard.

Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #8 of 38 Old 02-28-2011
Senior Member
 
Sabreman's Avatar
 
Join Date: Sep 2006
Location: Yeocomico River, VA
Posts: 1,643
Thanks: 3
Thanked 18 Times in 15 Posts
Rep Power: 10
   
Quote:
The force would be distributed to all of the stanchions by way of the lifelines. If your lifelines are attached to the bow and stern like most boats you might end up with a bent stanchion or two
I forgot about that. Since the wire is attached at both ends, the stanchion can't fold completely over. The strength or the wire & fittings will stop it from happening.

Sabre 38 "Victoria"
Sabreman is offline  
Quote Quick Reply Share with Facebook
post #9 of 38 Old 02-28-2011
Morgan 33 O.I. Perryville
 
travlineasy's Avatar
 
Join Date: Dec 2010
Location: Maryland
Posts: 3,564
Thanks: 3
Thanked 150 Times in 133 Posts
Rep Power: 5
 
Sure glad I'm on a diet--gotta' get skinny again!

Cheers,

Gary
travlineasy is offline  
Quote Quick Reply Share with Facebook
post #10 of 38 Old 02-28-2011
Senior Member
 
Argyle38's Avatar
 
Join Date: Oct 2010
Location: Connecticut
Posts: 245
Thanks: 13
Thanked 9 Times in 9 Posts
Rep Power: 5
 
I was told once that, when you are at sea, treat the edge of the boat like it was a 1000 foot cliff face and treat the lifelines like they had 10,000 volts on them.

Obviously neither are true, but you get the idea. The lifelines should be the last in a long line of safety layers designed to keep you on the boat.

S/V Argyle
Downeaster 38 #40

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Argyle38 is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
New lifelines - DIY or pro? NOLAsailing Gear & Maintenance 30 02-12-2012 10:53 AM
Lifelines !! Freesail99 Gear & Maintenance 9 05-27-2007 06:59 PM
Lifelines Trami Gear & Maintenance 16 01-05-2004 05:01 PM
Lifelines wgfischer Gear & Maintenance 8 06-17-2003 11:39 AM
Lifelines catnip508 Gear & Maintenance 1 06-01-2002 10:03 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome