Cruisers Forum
 


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 20-04-2021, 18:24   #1
Registered User
 
finefurn's Avatar

Join Date: Jan 2013
Location: Mason, NH
Boat: 1984 Hunter 27
Posts: 104
Shroud tension

What is the correct tension for the shrouds on a 1984 Hunter 27, and how do I go about measuring. Should this be done on the hard on in the water, does it make a difference.
finefurn is offline   Reply With Quote
Old 20-04-2021, 18:54   #2
Registered User

Join Date: Jul 2020
Location: SoCal
Boat: Beneteau 323
Posts: 245
Re: Shroud tension

You can get a tension gauge, it should come with a chart of tension values. Usually, you want it to be around 10% of breaking strength for a particular size of cable.

That said, you set tension and rigging not to 10% of breaking strength per-se, but to proper mast geometry AND tension. That means that some will be slightly higher or lower in value as needed to create geometry optimized for your boat, rigging, sails, skills, handling preferences.

It can be done on the water or on land, but you need to be careful not to have significantly different tension on various sides. You want them to always be within a reasonable small difference of each other.
George_SD is offline   Reply With Quote
Old 20-04-2021, 22:11   #3
Registered User

Join Date: Oct 2020
Boat: Coast 34 Sail
Posts: 148
Re: Shroud tension

One method that helped us when we were new was to have a professional tune the rig and then take tension measurements as a guide. Tuning a rig is part art part science so finding the right rigger and tension for your boat may be a process but it has been a rewarding part of our experience.
Tomodore is offline   Reply With Quote
Old 29-04-2021, 09:18   #4
Registered User
 
Orion Jim's Avatar

Join Date: Dec 2008
Location: Noank, Ct. USA
Boat: Cape Dory 31
Posts: 2,338
Images: 8
Re: Shroud tension

Every Tom, Dick, and Mary will have an opinion on how to tune a rig, the vast majority are subjective and based on their own set of biases. The best method of objectively tuning your rig is to use a tension gage, such as a Loos gage. With this method you will obtain PRECISE tension measurements.
Orion Jim is offline   Reply With Quote
Old 29-04-2021, 09:45   #5
Registered User
 
Cheechako's Avatar

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 23,678
Re: Shroud tension

I just final adjust mine under sail, usually in a decent breeze going to weather. Adjust the lee side then tack and adjust the other.
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 29-04-2021, 09:49   #6
Registered User

Join Date: Nov 2016
Location: Sarnia ON
Boat: S2 9.1
Posts: 200
Re: Shroud tension

Tension gauges are handy but you can tune a rig without one.

Basically you want start with your uppers, using the main halyard measuring from side to side to get your mast head centred. Then tension your shrouds, keeping the mast in column.

They are tight enough, if when sailing up wind in a moderate breeze, the mast is straight,or the upper portion is falling off slightly, and your leewards shrouds are not excessively loose.

Good luck
Gary Mc is offline   Reply With Quote
Old 29-04-2021, 09:56   #7
Registered User

Join Date: Mar 2016
Location: Portsmouth, VA
Boat: Morgan 382
Posts: 298
Re: Shroud tension

For an explanation, read "Sail and Rig Tuning" by Ivar Dedekam.
The short of it is that the _starting_ point is 10%-20% breaking of the wire. There are several ways to measure that. But that is the starting point. To get it correct, you need to go sailing. The leeward shrouds should not go slack, and the mast should stay straight and not bow to leeward. There is an order to it, and it's different for different types of rigs, etc.
__________________
-Warren
wholybee is offline   Reply With Quote
Old 29-04-2021, 10:10   #8
Registered User
 
Tsuru's Avatar

Join Date: Feb 2019
Location: Hood River Ore
Boat: Catalina 36 MK2
Posts: 82
Re: Shroud tension

I agree with the posters above. Everyone has an opinion and tune the rig to your boat instead of an arbitrary tension. It’s ok to do the initial adjustment on the hard but it really needs to be done with the boat in the water.

I think of rig tuning as a journey instead of a one time deal. Start the journey but going to every sailmaker and read what they say about rig tuning. They have a vested interest in getting it right. The first one that I came across was North - https://www.northsails.com/sailing/e...-tune-your-rig
Tsuru is offline   Reply With Quote
Reply

Tags
shroud

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Shroud tension on a cat pillars Seamanship & Boat Handling 14 06-06-2017 12:32
Aluminum vs Carbon Steel for Shroud Support / Shroud Design Load Norado Construction, Maintenance & Refit 1 30-05-2017 07:43
Spreader End Cap on Shroud - Tension? Capt Ben General Sailing Forum 12 22-05-2013 18:23
Shroud tension on a two spreader (backwards) no backstay rig JuanCH Monohull Sailboats 1 29-06-2011 20:18
Proper Shroud Tension dijon Monohull Sailboats 0 19-09-2010 09:03

Advertise Here


All times are GMT -7. The time now is 15:28.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.