Line for main halyard - Page 3 - SailNet Community

   Search Sailnet:

 forums  store  

Quick Menu
Boat Reviews  
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Hatches and Portlights
Interior And Galley
Marine Electronics
Other Items
Plumbing and Pumps
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here

Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
Old 01-31-2012
JimsCAL's Avatar
Senior Member
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,673
Thanks: 2
Thanked 60 Times in 55 Posts
Rep Power: 9
JimsCAL is on a distinguished road
I would avoid the standard polyester double braid and go with a low stretch line. Something with a poly-dyneema blend core and a poly cover will give you good performance and still be reasonable in cost. I have used the rigging service at Defender many times. Good price on the line and quick turnaround on the splices. Remember if you get a parallel core line, you need to do a core-to-core splice which is not for beginners.
Reply With Quote Quick reply to this message Share with Facebook
Old 01-31-2012
zz4gta's Avatar
I don't discuss my member
Join Date: Aug 2007
Location: Chesapeake Bay
Posts: 2,527
Thanks: 0
Thanked 31 Times in 31 Posts
Rep Power: 8
zz4gta is on a distinguished road
Not a lot of people using kevlar anymore. Dacron double braid stretches a lot in comparison to modern line. Imho, no real reason to use stretchy line these days. Too many better options out there. And if you shop around, the price ain't bad either. Stop using 1/2" line for everything, and save some money.

Dyneema is probably the best (all around performer), but it does creep (which is different than stretch), not a big deal on sheets and halyards. One downside to dyneema as a core material is that the poly cover will stretch and slip over the core. Usually making it hard to hold in a clutch (the clutch holds the cover, but the core slips through). A simple lock stitch will help this or you can coat the core in maxi jacket. Also, a thicker line helps, you can add a small line like 3mm-4mm inside the core of where the clutch grabs to help hold it. I may do this on my 1/4" Endurabraid main halyard.

Everything stretches. Even wire. Here's an 'ok' chart showing some lines and their stretch under load.

Please note that the chart is not drawn to scale. This makes it look like low stretch lines are not a big deal, and in actuality, they are. This is only 8mm line at 500 lbs of load over 30' of line. Most boats will have more than 30' of line and a higher load applied. Do the math.

40'x 0.018 = 0.72'
0.72x12" = 8.64"

I don't know about you, but not having 8+" of hoist on my main, makes a HUGE difference in performance. As stated above, the stretch comes at the worse possible time, during a puff. And just think, your sail is stretching too, and your main sheet, traveler, outhaul, etc. Why not limit as much stretch as possible?
Merit 25 # 764 "Audrey"
Reply With Quote Quick reply to this message Share with Facebook
Old 01-31-2012
smurphny's Avatar
Over Hill Sailing Club
Join Date: Feb 2009
Location: Adirondacks NY
Posts: 3,187
Thanks: 76
Thanked 87 Times in 84 Posts
Rep Power: 7
smurphny is on a distinguished road
That's a good drawing. I don't think you'd get the full 8" of stretch because the boltrope is prestretched inside the luff and there is the strength of the sail material added to the boltrope once the downhaul is tightened. Still....even 1" of stretch is a significant amount for a well set up rig to be changed. Wire certainly does stretch a little. One method of rig tuning is to measure the stretch in the shrouds as you tighten the turnbuckles.
Alberg 35: With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship.
Reply With Quote Quick reply to this message Share with Facebook

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


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

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
Main Halyard on P-30 TBG P30 3 08-02-2011 04:58 PM
Main Halyard Fix bushrat Gear & Maintenance 4 08-05-2008 09:46 PM
Main Halyard theArchitect General Discussion (sailing related) 12 06-11-2007 10:17 PM
main halyard Sailmale Gear & Maintenance 5 06-20-2002 09:25 PM
Rereaving the Main Halyard Dan Dickison Racing Articles 0 02-11-2002 07:00 PM

All times are GMT -4. The time now is 11:01 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) LLC 2000-2012

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