Compression Post Blues - 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 > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 10-04-2009
Junior Member
 
Join Date: Jun 2009
Location: Alaska
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
lavery is on a distinguished road
Compression Post Blues

Sailors,
I would like to discuss a possible mast compression problem with people who have been there, done that, and have the t-shirt.

I am looking at a Southern Cross 31 with lots of deck crazing, cracking around stanchions etc. A survey has turned up no concerns about deck or hull integrity. My concern is the apparent slight crushing or dishing of the cabin top in the area of the mast step. Also, there are parallel cracks in the fiberglass surface where the cabin top meets the deck in the area of the mast.

The survey did not determine a reason for the dishing. The surveyor looked but did not observe a compression post problem.

First, does deck dishing around the mast step indicate a serious problem?

If so, might hidden compression post problems exist that require disassembly for observation? What parts of mast removal and compression post disassembly require yard expertise and what can be done by a do-it-yourselfer? What $ values might be assigned to different repair scenarios?

Any light you can shed is greatly appreciated.

Jim Lavery
__________________
lavery
s/v Polar Bear
Reply With Quote Share with Facebook
  #2  
Old 10-04-2009
jmolan's Avatar
Member
 
Join Date: Sep 2009
Location: Alaska/Mexico/Oregon
Posts: 67
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
jmolan is on a distinguished road
Lavery, I would post this question over at Brion Toss's site.

SparTalk - Powered by vBulletin

There is a number of riggers and plenty of boat guys there who check in. Good bunch.

Jack
__________________
(time spread between) Alaska, PNW, & Mexico


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.


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

Last edited by jmolan; 10-04-2009 at 08:04 PM.
Reply With Quote Share with Facebook
  #3  
Old 10-04-2009
Junior Member
 
Join Date: Jun 2009
Location: Alaska
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
lavery is on a distinguished road
Thank you Jack. I'll do it.
__________________
lavery
s/v Polar Bear
Reply With Quote Share with Facebook
  #4  
Old 10-04-2009
Senior Member
 
Join Date: Jul 2008
Location: chesapeake bay
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
scottyt is on a distinguished road
lavery over at sailboatowners.com there are also some post replacement right ups there too. they may not be for your boat but they can still help
Reply With Quote Share with Facebook
  #5  
Old 10-04-2009
Junior Member
 
Join Date: Jun 2009
Location: Alaska
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
lavery is on a distinguished road
Thank you Scottyt - I'll head over there right now.
__________________
lavery
s/v Polar Bear
Reply With Quote Share with Facebook
  #6  
Old 10-04-2009
Senior Member
 
Join Date: Jul 2008
Location: chesapeake bay
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
scottyt is on a distinguished road
Quote:
Originally Posted by lavery View Post
Thank you Scottyt - I'll head over there right now.
i just looked... if you do a search on compression post you will get 4 pages of results. it will cover all boat types.
Reply With Quote Share with Facebook
  #7  
Old 10-05-2009
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,071
Thanks: 0
Thanked 68 Times in 59 Posts
Rep Power: 7
mitiempo will become famous soon enough mitiempo will become famous soon enough
It's not a rigging problem, but a structural problem. Whatever post/bulkhead or beam that is designed to support the mast in the Southern Cross is failing. Find out what method was used by investigation. Sometimes there is a block under the cabin sole and if wood it can rot over time allowing the post to sink slightly. Sometimes the beam under the cabin top will sag. When you know how it was designed and built you can plan for a fix. Until then you are just guessing.
Brian
Reply With Quote Share with Facebook
  #8  
Old 10-05-2009
Stillraining's Avatar
Handsome devil
 
Join Date: Jan 2008
Location: LaConner,Washington
Posts: 3,477
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
Stillraining is a jewel in the rough Stillraining is a jewel in the rough Stillraining is a jewel in the rough
Quote:
Originally Posted by mitiempo View Post
It's not a rigging problem, but a structural problem. Whatever post/bulkhead or beam that is designed to support the mast in the Southern Cross is failing. Find out what method was used by investigation. Sometimes there is a block under the cabin sole and if wood it can rot over time allowing the post to sink slightly. Sometimes the beam under the cabin top will sag. When you know how it was designed and built you can plan for a fix. Until then you are just guessing.
Brian
Agreed..Its either in the deck core or the post top or post base or what the post sits on above the keel. It ain't rocket science figuring it out... that's not meant meanly by the way....just check all the options and you will find the culprit.
__________________
"Go Simple...Go Large"

Relationships are everything to me..everything else in life are just tools to enhance them.


The purchase price of a boat is just the admittance fee to the dance...you still have to spend money on the girl...so court one with something going for her with pleasing and desirable character traits others desire as well... or you could find yourself in a disillusioned relationship contemplating an expensive divorce.
Reply With Quote Share with Facebook
  #9  
Old 10-05-2009
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,071
Thanks: 0
Thanked 68 Times in 59 Posts
Rep Power: 7
mitiempo will become famous soon enough mitiempo will become famous soon enough
I tried to research how the mast is supported but got nowhere on the web. I did find an original brochure on the 28 http://www.msogphotosite.com/MSOG/pd...cross28bro.pdf , but doesn't mention the mast support.
Brian
Reply With Quote Share with Facebook
  #10  
Old 10-05-2009
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,071
Thanks: 0
Thanked 68 Times in 59 Posts
Rep Power: 7
mitiempo will become famous soon enough mitiempo will become famous soon enough
Here's a drawing of the layout showing what looks like a vertical post just to port of the head. I do know that some of these hulls were sold for owner completion so your interior may not be the same. If it is I think either the deck is crushed under the mast or the post's support under the floorboards may have issues. But I don't think the post could move much without affecting the bulkhead/door arrangement. If it moved the door(s) would not fit properly.
Brian
Attached Thumbnails
Compression Post Blues-sc31.jpg  
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
Compression Post by Thomas Wright mcollins07 Pacific Seacraft 6 11-06-2009 11:14 PM
Building a Rudder Newport 30 Armchairprotest Gear & Maintenance 5 04-07-2009 01:11 PM
Eliminate Compression Post? Calculation of Force kaakre Gear & Maintenance 3 10-29-2006 04:01 PM
Compression Post? SailOntario Gear & Maintenance 11 08-24-2006 09:03 AM
C&C25 compression post jimgre Gear & Maintenance 2 03-28-2001 07:03 AM


All times are GMT -4. The time now is 03:01 PM.

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

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