Winterizing Standing riggging? - SailNet Community
 6Likes
  • 6 Post By RichH
 
LinkBack Thread Tools
post #1 of 7 Old 12-05-2017 Thread Starter
Junior Member
 
Chris Arias's Avatar
 
Join Date: Oct 2017
Location: Virginia
Posts: 2
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Winterizing Standing riggging?

Hi

I recently read, it is suggested to loosen the standing rigging for the winter and then re-tune in the spring. Now this contradicts another article I read on metal fatigue, that stated loose and then stressed steal cable will increase the rate of fatigue on rigging and shorten their life and a constant tension is best. This article was referencing the proper tension on the rigging is important and a poorly tune rig, one that the lee shrouds slacken and then come under tension when to windward, is bad. The first article is more about relieving tension over the winter.

Can anyone expand on this or have any thoughts?

Thanks
chris
Chris Arias is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 12-05-2017
Lake Sailor
 
cb32863's Avatar
 
Join Date: Oct 2009
Location: Minneapolis, MN
Posts: 1,082
Thanks: 0
Thanked 19 Times in 19 Posts
Rep Power: 10
 
Re: Winterizing Standing riggging?

Can you post a link to the article? My boats rig does the lee slack all the time and I have mine tuned to the specs of the manufacturer. How are the lee shrouds supposed to stay in tension anyway? They are not under load.

Umquam Porro

Seeker 1992 Beneteau First 235


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cb32863 is online now  
post #3 of 7 Old 12-05-2017 Thread Starter
Junior Member
 
Chris Arias's Avatar
 
Join Date: Oct 2017
Location: Virginia
Posts: 2
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Winterizing Standing riggging?

At the moment I cant. It was a mental note and i dont know the source right off hand. My guess is I read it in Practical Sailor in the past year but I also subscribe to Sail and World Cruiser as well, but then again I read a lot of books and online articles so that needle is in one of those haystacks. Ill look around to see what I can find.
Chris Arias is offline  
 
post #4 of 7 Old 12-05-2017
Senior Member
 
RichH's Avatar
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 5,042
Thanks: 54
Thanked 328 Times in 312 Posts
Rep Power: 21
   
Re: Winterizing Standing riggging?

Hopefully this will point you in the right direction .....

Sailboats typically have aluminum masts and stainless steel rigging.
Such metals expand and contract upon changing temperatures. Aluminum has a higher rate of expansion/contraction due to temperature changes than does stainless steel. In wintertime the Aluminum will contract faster than stainless steel .... the 'shrinking' aluminum mast will unload tension in the rigging.

Fatigue ....
Common (300 series) stainless steel has a fatigue endurance limit of approx 30,000 psi, it also 'can' have a yield strength (permanently changes dimensions) at approx the same 30,000 psi (equivalent to approx. 30% rig tension!!). This is for common stainless steels; 300 series stainless steel can have 'better' values based on 'heat treatment and other metal forming processes'

Fatigue in 300 series stainless 'starts' to become a serious problem when the fatigue endurance limit (~30,000 psi) is repetitively (cyclically) exceeded -- usually at greater than ~1 million load cycles at greater than the fatigue endurance limit (~30,000 psi), at which time there's a high probability that such a 'part' will simply fall apart/shatter from the accumulated fatigue.

So, with your wintertime mast shrinking faster than the stainless rigging, which unloads the rigging; the normal (summertime) ~15% tension in rigging becoming less as it and the mast gets colder; the rigging tension remaining well under the fatigue endurance limit of 30% of ultimate tensile .... there's damn little potential for fatigue in your rigging during wintertime .....
...... unless your boat is heeled over to greater than about 45++ during during a 'blow' in excess of ~Cat 5 and/or any 'gusts' causes extreme mast vibration that would add up to ~1 million load cycles that exceed that 30% tensile strength ....

... the 'real' answer is:
If the rig didn't have severe oscillations from the wind in summertime, it will probably have LESS potential for vibratory oscillations when the rig relaxes during the winter.
You dont need to do 'anything' with the rigging for wintertime, it automatically unloads itself.

;-)

Last edited by RichH; 12-05-2017 at 05:11 PM.
RichH is offline  
The Following User Says Thank You to RichH For This Useful Post:
Chris Arias (12-06-2017)
post #5 of 7 Old 12-05-2017
Junior Member
 
Norahsark1's Avatar
 
Join Date: Oct 2015
Posts: 21
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 0
 
Re: Winterizing Standing riggging?

For the boat with slack lee shrouds, look for flex in the boat. The mast step is the first place I would look, if it is compressing under load you have a mast that is effectively getting shorter under load and no amount of rig adjusting can overcome that.
If it's not the mast step look at everything else that holds the rig up.
Norahsark1 is offline  
post #6 of 7 Old 12-06-2017
Senior Member
 
pdqaltair's Avatar
 
Join Date: Nov 2008
Location: Deale, MD
Posts: 3,582
Thanks: 4
Thanked 121 Times in 119 Posts
Rep Power: 11
 
Re: Winterizing Standing riggging?

I wonder if the issue here is not the rigging, but the sustained force applied to the hull. This is a factor on some light boats.

Heck, I release tension every time I finish sailing, but that is an extreme case and the boat is built for it. But it is certainly not a fatigue issue; the loads are too low at the dock.

I would have some concerns regarding galling the screws by doing this frequently. Hopefully the turnbuckles are bronze (most are, either chromed or with bronze inserts) and lubing EVERY TIME with Tefgel.

Writing full-time since 2014
Author--Rigging Modern Anchors

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


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

"Keeping a Cruising Boat for Peanuts"
"Faster Cruising for the Coastal Sailor"
"Singlehanded Sailing for the Coastal Sailor"
pdqaltair is online now  
post #7 of 7 Old 12-08-2017
Lake Sailor
 
cb32863's Avatar
 
Join Date: Oct 2009
Location: Minneapolis, MN
Posts: 1,082
Thanks: 0
Thanked 19 Times in 19 Posts
Rep Power: 10
 
Re: Winterizing Standing riggging?

Quote:
Originally Posted by Norahsark1 View Post
For the boat with slack lee shrouds, look for flex in the boat. The mast step is the first place I would look, if it is compressing under load you have a mast that is effectively getting shorter under load and no amount of rig adjusting can overcome that.
If it's not the mast step look at everything else that holds the rig up.
While that could be an issue, it is rarely the case. As in this tip from Sailing World on maintaining boat speed; "No. 4 Every boat has its optimal rig tension. Find out what it is and maintain it. Most boats sail best with the rig just tight enough so that the leeward shroud starts to go slack when it's blowing 10 to 12 knots."

Umquam Porro

Seeker 1992 Beneteau First 235


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cb32863 is online now  
Reply

Quick Reply
Message:
Options

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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Winterizing GaiaOrion General Discussion (sailing related) 0 10-25-2013 04:04 PM
Winterizing AlanInSeattle Gear & Maintenance 26 01-02-2010 10:46 AM
Winterizing Popsbear Newport 0 11-08-2007 09:33 PM
Winterizing drynoc Gear & Maintenance 4 11-24-2005 02:35 PM
How much winterizing do I need? foxglove Gear & Maintenance 7 09-18-2004 12:22 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome