Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 16-11-2017, 19:22   #1
Registered User

Join Date: Nov 2017
Location: USA
Boat: Dufour 382 37'
Posts: 6
Jack lines -- sew the loops or rivet them?

I'm making jack lines for my 37' sloop, and I've got the heavy duty 1.5" webbing all ready to go. And I was planning on sewing the loops in each end with foot-long "W" stitches using high-strength thread.

But then I talked to an experienced commercial captain, and he said he just rivets them. He says it's much easier to do. Plus, you can rivet while you're right there on the deck, at the attachment point(s), assuring that you're getting the measurement exactly correct.

Opinions, board-mates? Which is better, sewing or riveting? Thx!
__________________

__________________
PaintedKite is offline   Reply With Quote
Old 16-11-2017, 19:31   #2
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Nevada City. CA
Boat: Sceptre 41
Posts: 3,745
Images: 9
Re: Jack lines -- sew the loops or rivet them?

I would think sewing. Reason being you can make multiple passes on the webbing and it will spread any load over the entire area that was sewed. 4 or 5 bar tacks first one goes you still have more. I guess you could put in multiple rifvets but the material will not react as well to it an 1/8" hole thru the weave.
__________________

__________________
Fair Winds,

Charlie

Between us there was, as I have already said somewhere, the bond of the sea. Besides holding our hearts together through long periods of separation, it had the effect of making us tolerant of each other's yarns -- and even convictions. Heart of Darkness
Joseph Conrad
Charlie is offline   Reply With Quote
Old 16-11-2017, 19:44   #3
Registered User

Join Date: Oct 2015
Location: No home port, full time cruiser
Boat: Amel 53
Posts: 186
Re: Jack lines -- sew the loops or rivet them?

I would sew loops in one side of the jack lines, and tie the other side to a cleat. You should be using nylon webbing (not polyester) for it's better UV resistance. But nylon does stretch a lot when it gets wet, so you need to be able to adjust the length. to keep it tight. No type of webbing should be permanently mounted on deck in the sun. You won't know it has lost it's strength until it breaks when you need it.

Normally what I do is toss the webbing in the water to wet it, then pull it really tight and tie it off.
__________________
billknny is offline   Reply With Quote
Old 16-11-2017, 20:00   #4
Moderator
 
Don C L's Avatar

Join Date: Sep 2014
Location: Channel Islands, CA
Boat: 1962 Columbia 29 MK 1 #37
Posts: 4,384
Images: 34
Re: Jack lines -- sew the loops or rivet them?

I sewed mine. (A full foot seems quite extreme though.) Riveting will probably work fine too.
__________________
DL
Pythagoras
1962 Columbia 29 MKI #37
Don C L is offline   Reply With Quote
Old 16-11-2017, 20:04   #5
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2005
Boat: Outbound 44
Posts: 4,581
Re: Jack lines -- sew the loops or rivet them?

Some info here on sewing loop
Jack line stiching
__________________
Paul L
http://svjeorgia.blogspot.com
Paul L is online now   Reply With Quote
Old 16-11-2017, 20:04   #6
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 4,336
Re: Jack lines -- sew the loops or rivet them?

He may be an experienced captain, but I would start by asking him if any of them have been strength tested. I think it is extremely unlikely that the joint is over 35% strength.

As for sewing, unless you are willing to strength test samples, this is dangerous. I have broken hundreds of sewing samples in testing, and they often don't add up the way you expect.

Nylon is worse for UV, not better. It is also much more difficult to sew well because of the stretch.

No, you can NOT spread the stitching over one foot. In that foot there will be more than one stitch worth of differential stretch under load, and the stitches will tear. The stitching must all be within a few inches to have any value (1-inch for nylon).

https://www.practical-sailor.com/iss...h_11663-1.html
__________________
Gear Testing--Engineering--Sailing

Writing full-time since 2014.
Bookstore:http://sail-delmarva.blogspot.com/20...ook-store.html
thinwater is offline   Reply With Quote
Old 16-11-2017, 20:48   #7
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,827
Re: Jack lines -- sew the loops or rivet them?

I would sew it, no question.
If you value your life, it's a pretty simple thing to figure out.

If I was making one now, I'd not use any other thread than GoreTex (Tenara).
It's guaranteed forever not to go bad in Ultraviolet.
I sewed our trampolines with it after having to restitch them every 3 years.
Last time I sewed them with GorTex. The stitching looks brand new amost ten years later.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 16-11-2017, 23:56   #8
Registered User

Join Date: Jul 2006
Location: Underway in the Med -
Boat: Jeanneau 40 DS SoulMates
Posts: 1,904
Images: 1
Re: Jack lines -- sew the loops or rivet them?

As an exclimber I tie mine -
__________________
just our thoughts and opinions
chuck and svsoulmates
In Marmaris Turkey for the winter
chuckr is offline   Reply With Quote
Old 17-11-2017, 09:43   #9
Registered User

Join Date: Apr 2015
Location: UK
Boat: Moody 37
Posts: 56
Re: Jack lines -- sew the loops or rivet them?

Buy them ready made by a professional. Usually stitched over a few inches. throw them away after 1 year in the sunshine.
__________________
davewtsnape is offline   Reply With Quote
Old 17-11-2017, 09:45   #10
Registered User

Join Date: Mar 2015
Posts: 136
Re: Jack lines -- sew the loops or rivet them?

[QUOTE=billknny;2519836]I would sew loops in one side of the jack lines, and tie the other side to a cleat. You should be using nylon webbing (not polyester) for it's better UV resistance.

DANGEROUS ADVICE offered above
polyester aka Dacron has much better UV resistance than nylon.
__________________
guyrj33 is offline   Reply With Quote
Old 17-11-2017, 10:04   #11
Senior Cruiser
 
John_Trusty's Avatar

Cruisers Forum Supporter

Join Date: Oct 2014
Location: Michigan, USA
Boat: Catalina 36 (1999)
Posts: 234
Re: Jack lines -- sew the loops or rivet them?

In addition to the strength issues already discussed, I would be more about the abrasion of rivets on the deck. As you probably know, jacklines wobble on deck even if someone is not clipped on. After a few hundred miles, I would think that would start chafing unless you wrapped the contact points. As another data point, I've never seen commercially made ones with rivets.

What's the material of the rivets -- corrosion risk?
__________________
John Trusty

Better to trust the man who is frequently in error than the one who is never in doubt." -- Eric Sevareid
John_Trusty is offline   Reply With Quote
Old 17-11-2017, 11:16   #12
Registered User

Join Date: Sep 2014
Location: Manila, California
Boat: Cape George pilothouse 36 and a Cape Dory 25
Posts: 235
Re: Jack lines -- sew the loops or rivet them?

My jacklines are tied with bowlines fore and aft. I like to take them out of the sun when they are not needed for extended periods.
__________________
fatherchronica is offline   Reply With Quote
Old 17-11-2017, 11:25   #13
Registered User

Join Date: Jul 2015
Location: Mexico, mainland side
Boat: Tayana 48 DS
Posts: 21
Re: Jack lines -- sew the loops or rivet them?

Quote:
Originally Posted by chuckr View Post
As an exclimber I tie mine -
+1

Tie a water knot and be done with it. I've trusted my life to these many times climbing. I think I'd be more comfortable with a proven climbing knot than amateur stitching
__________________
www.gadaboutlife.com
wagsea6b is offline   Reply With Quote
Old 17-11-2017, 11:48   #14
Registered User
 
Suijin's Avatar

Join Date: Feb 2013
Location: Annapolis MD; currently in Oriental NC
Boat: Valiant 40
Posts: 2,912
Re: Jack lines -- sew the loops or rivet them?

I use knots. One end goes on the bow cleat and the other is tensioned to a heavy padeye with dynema lashing. I wet the webbing first and then tension taut. It will be even tauter when it's dry. I also throw in a few twists so it's easier to catch it off the deck with my fingers rather than laying completely flat.
__________________
Suijin is offline   Reply With Quote
Old 17-11-2017, 13:33   #15
Registered User

Join Date: May 2015
Location: Whangarei
Boat: Bavaria 38 Cruiser, 12meters, 2004
Posts: 109
Re: Jack lines -- sew the loops or rivet them?

Quote:
Originally Posted by PaintedKite View Post
I'm making jack lines for my 37' sloop, and I've got the heavy duty 1.5" webbing all ready to go. And I was planning on sewing the loops in each end with foot-long "W" stitches using high-strength thread.

But then I talked to an experienced commercial captain, and he said he just rivets them. He says it's much easier to do. Plus, you can rivet while you're right there on the deck, at the attachment point(s), assuring that you're getting the measurement exactly correct.

Opinions, board-mates? Which is better, sewing or riveting? Thx!
What about using a water knot or suchlike, through the eyes of cleats and other attachment points? Sure, there is the likelihood of having a knot roll under your feet as opposed to flatness of webbing everywhere else- but it will only be at either end of the jackstrap. In this case there is no need to rely on stitching or rivets, but on tried and tested knots used by the climbing community. Thoughts?

Oh ok, just read some more posts- not the most original thought was it? But glad to see other people think this way.
__________________

__________________
Kerry1 is offline   Reply With Quote
Reply

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
Rivet or ? mainsailman Construction, Maintenance & Refit 4 02-09-2015 10:03
Sew Clean for Marine Tanks, Heads and Hoses? silverp40 Plumbing Systems and Fixtures 14 12-06-2013 14:37
For Sale: Tuff Sew Zig Zag Machine SeaKing Classifieds Archive 11 01-02-2012 09:07
Pop Rivet Experts ? skipmac Construction, Maintenance & Refit 21 12-11-2010 05:06
Good bye "Sew Good" Wahoo Sails The Sailor's Confessional 6 06-12-2006 05:13



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 18:28.


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.