Jackline system - 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 > General Interest Forums > General Discussion (sailing related)
 Not a Member? 


Like Tree3Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 04-29-2013
Member
 
Join Date: Sep 2012
Posts: 73
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 2
Joel H. is on a distinguished road
Jackline system

After reading everything I could on safety harnesses and Jacklines, (with the conclusion being to stay out of the water and on deck), I came up with a system to allow me to move about my 27' Catalina while assuring that I cannot end up overboard. (It's not easy on a small boat like mine to have a workable system that won't end up being too loose/long to actually keep you on deck).
Anyway, attached are some photos of my system for tensioning a jackline on the centerline of my boat regardless of weather the hatch is open or closed, or any other variable. Also, I can use the same type of device to make my lanyard adjustable to be able to shorten or lengthen it as necessary, while moving about.

The neat little device you see in the pic that makes it all possible is from the mountaineering world and is called a "TIbloc" They work with a carabiner and any reasonable size line to lock the line at any point, (like a Jumar).
I welcome any thoughts or criticisms.
I won't bore everyone by describing every fixture, I'm hoping that the photos will be self explanatory. But if it interests you I will answer any questions.
Joel H.
Attached Thumbnails
Jackline system-0428131257a.jpg   Jackline system-0428131258.jpg   Jackline system-0428131258a.jpg   Jackline system-0428131258c.jpg   Jackline system-0428131300.jpg  


Last edited by Joel H.; 04-29-2013 at 09:54 PM.
Reply With Quote Share with Facebook
  #2  
Old 04-29-2013
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,390
Thanks: 63
Thanked 160 Times in 157 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Re: Jackline system

I'd suggest you use webbing rather than line.. it doesn't 'roll' underfoot like rope can.. also if you put a lot of twists in the webbing it's much easier to 'snag' when you want to clip in. (webbing lying flat on deck can be difficult to get a shackle/snaphook underneath it) Stretching the whole package up off the deck a bit helps too.. your setup may work well with that.
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Reply With Quote Share with Facebook
  #3  
Old 04-29-2013
Member
 
Join Date: Sep 2012
Posts: 73
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 2
Joel H. is on a distinguished road
Re: Jackline system

Oh, yes the pic doesn't show it but the line/adjuster is only at the companionway it is webbing from there foreword. I like your recommendation for twisting the webbing, thanks.
I highly recommend people check out these "Tiblocs" made by Petzl. They are cheap and quick to attach to a line for any reason, as well as ascending the rig. They seem like great emergency gear.
Cheers,
Joel H.
Attached Thumbnails
Jackline system-0428131257b.jpg  

Last edited by Joel H.; 04-29-2013 at 10:32 PM.
Reply With Quote Share with Facebook
  #4  
Old 04-30-2013
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,585
Thanks: 9
Thanked 41 Times in 36 Posts
Rep Power: 14
RichH will become famous soon enough
Re: Jackline system

The problem with tubular or flat double or triple ply webbing is the undue stretch that occurs under (shock) load when wetted. For 'climbing' this is good as it adds 'shock resistance' during impact (increases the 'time' of the impact); but, on a boat may cause the geometry to cause one to 'rebound' outside the limits of the lifelines.
In mountain rescue we hardly ever use 'webbing' for situations where the 'tether' attachments are at near horizontal and where the impact loads are perpendicular to the restraint line (ie. Tyrolean Traverse, etc.), we use 'rope' for all 'horizontals' (a similar config. to the jacklines set on boats); plus, all such 'traverse' lines are always set up 'slack' and allow a LOT of stretch so that the trigonometry of configuration does not develop infinite force in the traverse lines. If such a line is 'taught' and you push/pull at 90į to the run of the line and the line does not 'stretch', the force can be multiplied many times (can approach infinite force) that of the applied perpendicular force. In trigonometry, such a situation would be equal to "dividing by the trigonometric SINE of the deflection angle" of the line from its attachment point ... Inotherwords, apply force at 90 degrees to a very taught line and the attachment connections of that very tight line can possibly develop forces that approach INFINITY, which can break the rope, pull the connections out, etc.

The good thing with webbing used as jacklines is that the stretch upon impact, etc. allows the attachment angles to increase to comparatively very large angles with a corresponding lessening of the induced tension developed in the 'rope'/webbing. The downside is when webbing becomes wetted and unduly and increasingly stretches and you 'can' have a functional failure .... your body at full impact load can now be beyond the boundary of the deck.

Simple speak Rx: when setting up webbing jacklines on a boat, run them across the cabin top instead of the deck and leave them slightly 'slack', NEVER bar-tight!!!!!! Wet them thoroughly and TEST them with your body weight (impact) to be sure that youre getting large angles of deflection from the axis between the connection (to the boat) points when fully loaded by impact of your body weight perpendicular to the 'run' of the jackline .... but test them and adjust them so that the 'stretch' that occurs, keeps you onboard. When testing, If little 'stretch' occurs in the jackline and the connection 'angles' remain less than ~10į when you (test) impact, you risk pulling the connection points out, due to the possibility of the generation of infinite force along the axis of the webbing. Rope/wire cable doesnt stretch like webbing, so you have to set up with more 'slackness'.
I use a tether with three connections: one to the harness, a connection at the terminal end of the tether (in the cockpit usage), and one close (about midway) to harness for moving along the deck.

;-)

Last edited by RichH; 04-30-2013 at 11:08 AM.
Reply With Quote Share with Facebook
  #5  
Old 04-30-2013
Barquito's Avatar
Barquito
 
Join Date: Dec 2007
Location: Madison, WI
Posts: 1,810
Thanks: 0
Thanked 12 Times in 12 Posts
Rep Power: 7
Barquito is on a distinguished road
Re: Jackline system

How does is work when the hatch is closed? Would is tend to push the hatch open again? Is is difficult to get through the hatch?
__________________
Bristol 27
Cirque
Reply With Quote Share with Facebook
  #6  
Old 04-30-2013
dvuyxx's Avatar
s/v Tiger Lily
 
Join Date: Jun 2009
Location: Washington, DC - Annapolis
Posts: 509
Thanks: 41
Thanked 11 Times in 9 Posts
Rep Power: 5
dvuyxx is on a distinguished road
Re: Jackline system

Which is preferable? A life vest with the harness built in our a separate harness?
__________________
David
Severna Park, MD
Pearson 35 - s/v Tiger Lily
Reply With Quote Share with Facebook
  #7  
Old 04-30-2013
BayWindRider's Avatar
I'm Jon, I'm a sailaholic
 
Join Date: Jan 2010
Location: Woodbridge, VA
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
BayWindRider is on a distinguished road
Re: Jackline system

I also use a jackline system while onboard my Catalina 27. I crisscross two 30ft sailboat jackline straps (steel hooks on one end) that are attached to the pedestal and the bow cleats. If itís really bad weather I can attach the stern straps to the stern cleats. I use to repel in the Army so I donít trust a PFD with a steel ring as much as a dedicated harness. Heck, I still remember how to tie a swiss seat for repelling, but I wouldnít want to be dangling from it for any period of time. I use the mustang sailing harness and feel itís pretty comfortable under load. I also use the Stearns SoSpenders tether that attaches to the jackline and the mustang seat. This tether has a quick release that you can untether rapidly. The jacklines run along the inside of both deck handrails. I find this system adequate and really love the extra protection while taking down the mainsail in a chop. I do recommend that you test your system out while at the dock. This way you can adjust how far will it stretch under load, how the seat feels under load, and if any parts of it fail.
__________________
S/V Dulcinea, Catalina 27
Reply With Quote Share with Facebook
  #8  
Old 04-30-2013
BayWindRider's Avatar
I'm Jon, I'm a sailaholic
 
Join Date: Jan 2010
Location: Woodbridge, VA
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
BayWindRider is on a distinguished road
Re: Jackline system

Quote:
Originally Posted by dvuyxx View Post
Which is preferable? A life vest with the harness built in our a separate harness?
I would say harness since I wouldn't want a vest to support my body weight. If your hanging from a vest the weight will be at your armpits. The harness would shift the weight to your hips freeing your arms to pull yourself up. Just my .02 cents.
__________________
S/V Dulcinea, Catalina 27
Reply With Quote Share with Facebook
  #9  
Old 04-30-2013
jimgo's Avatar
Asleep at the wheel
 
Join Date: Sep 2011
Location: Pennsylvania
Posts: 2,776
Thanks: 69
Thanked 103 Times in 101 Posts
Rep Power: 3
jimgo is on a distinguished road
Re: Jackline system

I think the idea wasn't that this was just a life vest, but rather a vest with the harness built in, like these:
Mustang Deluxe Inflatable Life Jacket / PFD with Harness
__________________
- Jim
Home: Western Philly 'burbs
1980 Allmand 31
1975 Albacore 15


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
  #10  
Old 04-30-2013
TakeFive's Avatar
If it's blowin' I'm goin'
 
Join Date: Oct 2009
Location: Swarthmore, PA
Posts: 2,292
Thanks: 1
Thanked 26 Times in 26 Posts
Rep Power: 5
TakeFive will become famous soon enough
Re: Jackline system

OK guys, I have NO experience with clipping in, but I will be singlehanding this weekend so I've been studying up.

There is a real problem on the 27' and smaller boats with getting a tether that's long enough to have room to move around, yet that length allows you to dangle over the side. This is especially a problem on the foredeck where the boat gets narrower.

Some of us who have furlers also have an extra unused halyard from the masthead. What about clipping onto that halyard in addition to a traditional tether when on the foredeck? In the event of a fall, the halyard keeps you from dangling in the water, and the traditional tether keeps you from getting a "wild ride" off the side of the boat if the mast sways in rough water. It seems like the two in combination would be a good combination.

This was suggested to me by a guy on the Catalina 25 forum, who says he read about it in one of the Pardeys' books on cruising. It would seem to me that the halyard would allow you to use a longer tether on the bow.

What do you guys think?
__________________

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

Formerly posted as "RhythmDoctor"
1998 Catalina 250WK Take Five (at Anchorage Marina, Essington, on the Delaware River)
1991 15' Trophy (Lake Wallenpaupack)
1985 14' Phantom (Lake Wallenpaupack)
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
Help choosing my barrier coat system: Interprotect vs. West System vs. Other? Beersmith Gear & Maintenance 30 02-09-2011 01:10 PM
Jackline: to stern or not to stern dreuge Gear & Maintenance 10 12-24-2009 12:23 PM
Jackline Breaking Strength sailak Gear & Maintenance 5 05-27-2009 11:14 PM
System Three LPU dgr Gear & Maintenance 5 03-17-2009 12:11 AM
12v system and 24v system on 1 boat at same time? BigCatOne Gear & Maintenance 5 05-21-2007 07:55 PM


All times are GMT -4. The time now is 04:48 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