Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 29-07-2008, 10:38   #1
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
SWL guide to standing rigging

I need an on-line source for the safe working loads and breaking strength of 1 X 19, 304 SS, rigging wire, specifically 1/4" and 5/16". Any help appreciated. Thanks.
__________________

__________________
Roy M is offline   Reply With Quote
Old 29-07-2008, 11:39   #2
Moderator Emeritus
 
FrankZ's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Location: Chesapeake Bay
Boat: Bristol 35 Bellesa
Posts: 13,565
Images: 1
When I was looking for the same basic thing I did a google search and found it varies slightly by different manufacturers, but if you do a quick search I am sure you will find numbers that make you feel comfortable. I chose to use a lower average number for mine in case some were more optimistic than they should be.
__________________

__________________
Sing to a sailor's courage, Sing while the elbows bend,
A ruby port your harbor, Raise three sheets to the wind.
......................-=Krynnish drinking song=-
FrankZ is offline   Reply With Quote
Old 29-07-2008, 12:45   #3
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,152
A safe working load (SWL) will varie with the application. SWL is partly a function of the wires breaking strength and partly of the function of its application. SWL is usually a percentage of the breaking strain. So you really need to find out what the breaking strain of that wire is and the percentage they are using to determine their maximum SWL.

SWL for a given wire like for standing rigging might be different for a SWL for something that might receive shock loads (like some running rigging), severe wear and tear or is subject to corrosion. For severe service you would want to reduce the SWL from the manufacturers stated breaking strain and below their maximum stated SWL.

I'm thinking that what you really want to know is the breaking strain, the percentage they are using for SWL and the manufacturers maximum stated SWL and then reduce the SWL to suit your application.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 29-07-2008, 13:18   #4
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,152
I just read what I wrote and it is confusing at best. In a nutshell, the SWL for the application may be less than the manufacturers stated SWL for the wire itself. Never exceed the manufacturers stated SWL. If you are not certain, then consult with a very experienced rigger or a certified naval architect.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 29-07-2008, 14:30   #5
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
Good grief, guys! Please, I'm not asking for a lecture, I just don't have my rigging book handy with the simple data. That's all I'm asking for. Is there anyone with a link? Thanks, Roy
__________________
Roy M is offline   Reply With Quote
Old 29-07-2008, 15:38   #6
Senior Cruiser

Cruisers Forum Supporter

Join Date: Nov 2005
Location: Tasmania
Boat: VandeStadt IOR 40' - Insatiable
Posts: 2,317
Images: 91
Don't have ready access to 1x19 304 data handy, but typically

316 1x19
1/4" 7100 lb breaking
5/16" 10200 lb breaking

302 1x19
1/4" 8200 lb breaking
5/16" 12500 lb breaking

Souce: Harken catalogue 2005; Table of typical rigging breaking strengths
__________________
Weyalan is offline   Reply With Quote
Old 29-07-2008, 18:20   #7
Registered User
 
Ziggy's Avatar

Join Date: Apr 2008
Location: U.S., Northeast
Boat: Contessa 32
Posts: 1,421
Images: 2
Quote:
Originally Posted by Roy M View Post
I need an on-line source for the safe working loads and breaking strength of 1 X 19, 304 SS, rigging wire, specifically 1/4" and 5/16"
See Rigging only home page for breaking strengths. SWL is usually taken as 15% to 25% of the breaking strength.

Also, http://www.loosco.com/ has more technical data than you probably want.
__________________
Ziggy is offline   Reply With Quote
Old 29-07-2008, 18:25   #8
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
Now we're cookin'! Thanks guys!
__________________
Roy M is offline   Reply With Quote
Old 04-08-2008, 16:48   #9
Registered User

Join Date: Feb 2008
Posts: 46
[quote=Ziggy;187859]See Rigging only home page for breaking strengths. SWL is usually taken as 15% to 25% of the breaking strength.


Not true!
The safe working load is not used in standing rigging. We use a safety factor. This will varies form wire to wire on a boat.
eg A V1 wire will be around 2.5 to times the design load. And unless you have software or are an engineer you will be hard pressed to work out the design load for the individual wires on your yacht. If you are using a safe working load to size your wires I suggest that you get a professional to size the wire for you.
Cheers
__________________
Fard12 is offline   Reply With Quote
Old 05-08-2008, 03:27   #10
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,585
Images: 240
1x19 S/S (316) Wire Breaking Strengths from Rigging Only:
http://www.riggingonly.com/08wire.01.jpg

1/4" - 7,489 Lbs.
5/16 - 11,860 Lbs
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is online now   Reply With Quote
Reply

Tags
rigging

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Synthetic standing rigging roblanford Deck hardware: Rigging, Sails & Hoisting 33 31-12-2008 21:11
standing rigging Randyonr3 Construction, Maintenance & Refit 4 13-01-2008 06:41
Anchor Rode WLL or SWL Ratings karlg Anchoring & Mooring 2 18-04-2006 14:51
Standing Rigging Bill Balme Construction, Maintenance & Refit 8 25-11-2005 05:37
Standing Rigging Pa La O La Multihull Sailboats 6 28-07-2005 13:50



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 04:53.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.