Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 19-05-2018, 16:15   #1
Registered User

Join Date: May 2018
Location: Rockhampton Australia
Boat: Cavalier 32
Posts: 3
Chainplate Cavalier 32

Hi - I am new to this forum and am hoping someone can help me with some information. I own a Cavalier 32 and had a chainplate fail while sailing. Inspection of the piece which has come out through the deck looks like it has been subject to both stress and corrosion. It appears that the chain plate rests against the inside of the hull and is glassed over. It has a knee where it exits the deck. I would be very grateful if any one could supply me with any information about removal and replacement of chain plates on this or similar type of yacht

Thank you
__________________

brucesagnol is offline   Reply With Quote
Old 19-05-2018, 16:41   #2
Registered User
 
Snowpetrel's Avatar

Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,919
Re: Chainplate Cavalier 32

Its a pretty common problem on older boats. Stainless is very subject to stress corrosion cracking and crevice corrosion. Your other chainplate is probably also suspect, and maybe even backstay and forestay fittings. Basically any embeded stainless, even stainless bolts are suseptible to this failure mode.

It may be possible to fit new chainplates just inside the existing ones. Or otherwise carefully cut out the old ones and renew. Another approach would be internal chainplates that tie to through bolted deck mounted chainplates.

At least those cav 32's have a decent reputation for being built tough.
__________________

__________________
My Ramblings
Snowpetrel is offline   Reply With Quote
Old 19-05-2018, 17:33   #3
Registered User
 
Snowpetrel's Avatar

Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,919
Re: Chainplate Cavalier 32

The cav 32 has chainplates reasonably close to the deck edge. A quick and strong fix is external chainplates. This is what I did on my old 26 foot boat, drilling through the suspect internal chainplates. In you case is would look much less sleek, and effect the genoa sheeting angles. reducing pointing ability in flat water.

You have fore and aft lowers, so six suspect chainplates to replace. Its a biggish job, but once a system is sorted out it should go quickly. Some photo's of the internal structure and chainplates on deck would probably help sugest a few practical solutions.

At least you didn't loose the mast.
__________________
My Ramblings
Snowpetrel is offline   Reply With Quote
Old 20-05-2018, 02:57   #4
Senior Cruiser
 
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 34,605
Images: 240
Re: Chainplate Cavalier 32

Greetings and welcome aboard the CF, Bruce.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is online now   Reply With Quote
Old 30-06-2018, 20:34   #5
Registered User

Join Date: Jun 2018
Location: New Zealand
Boat: Cavalier 32
Posts: 3
Re: Chainplate Cavalier 32

Hi, just wondering how you are getting on with your chainplate replacements?
We are preparing our Cav32 to go offshore and are just in the process of having a marine engineer draw up alternative chainplate designs for our fwd/cap/lower shrouds. It's looking likely that we are going to go for an external chainplate, possibly circular design.
We have been feeling like we are just being somewhat super paranoid at the thought of grinding the glassed-in old chainplates off just so that we can inspect them as we haven't had any fail on us.... Yet! So, sorry to say this, but we are actually glad to have found your post and to hear that another Cav32 has had a chainplate fail.... We feel less paranoid now!
Did it do much damage? Which chainplate failed?
A previous owner had definitely changed the design of our fwd lower chainplate (which doesn't seem to be an improvement and also seems to have let in water below deck).
Anyhow we could talk about chainplates forever, so we will keep it brief (mildly obsessed with the subject atm).
Let us know where you are up to and we will be happy to share ideas! Cheers
Sony126 is offline   Reply With Quote
Old 01-07-2018, 01:12   #6
Registered User

Join Date: May 2018
Location: Rockhampton Australia
Boat: Cavalier 32
Posts: 3
Re: Chainplate Cavalier 32

Hi
I have inspected the other chain plates and have found various degrees of corrosion in the 4 other of others as well. The starboard cap shroud chain plate had been replaced previously and has no corrosion however I am not happy with how it was done as it appears the new one was glassed over the top of the old one. I will be replacing them all (including back stay) with the same design as I also am looking to go well offshore in the future. The one that failed was the port side forward lower. It was under a lot of tension at the time as we were going to windward in 17 to 20 with the back stay hard on. No other damage done, the mast remained well supported. We didn't push our luck and dropped sail once we figured out what had made the loud bang and shudder. (The shroud did not come clear of the deck - just lost all its tension.)

If you send me your email address I would be happy to email you photos I have taken with cabinetry removed so you can get an idea of where to look.


Cheers
brucesagnol is offline   Reply With Quote
Old 01-07-2018, 01:35   #7
Registered User
 
Alan Mighty's Avatar

Join Date: Mar 2014
Location: Scarborough Boat Harbour, Moreton Bay
Boat: US$4,550 of lead under a GRP hull with cutter rig
Posts: 1,296
Re: Chainplate Cavalier 32

Stress crack corrosion and crevice corrosion are par for the course with 316 stainless steel. 316 can be thought of as a compromise (or a compromised material): it has a relatively short service life.

I've a different design and I removed and changed chainplates a few years back.

I avoided 316 and went instead for duplex stainless steel, specifically 2205 and 2504. Much stronger and with much longer service life than 316. Longer as in 2.5x longer.

You're a few days sail north of me, but for what it is worth following this link will lead you to mention of the people I used for 2205 plate and for fabrication: Chainplate Replacement

With luck, you'll find someone who can supply and cut the plate and someone to do the fabrication closer to you.
__________________
“Fools say that you can only gain experience at your own expense, but I have always contrived to gain my experience at the expense of others.” - Otto von Bismarck
Alan Mighty is offline   Reply With Quote
Old 12-07-2018, 16:16   #8
Registered User

Join Date: Jun 2018
Location: New Zealand
Boat: Cavalier 32
Posts: 3
Re: Chainplate Cavalier 32

Hi again,
sorry for the delay getting back to you.... we have started remodelling our forward cabin and it's taking up all our spare time atm.
I don't think I mentioned that we had all our rigging overhauled and upgraded in Feb this year at which time we removed both our fore and backstay chainplates. Our backstay chainplate had a some pitting but my husband noticed a decent stress fracture that we actually opened up and it broke in half, just bending it by hand! We felt very lucky this hadn't happened on the water. It is a different configuration to the others though as it consists of 2 separate SS pieced bolted together through the deck. The lower section is like an upside down U that fits over a knee? (think that is what it is called).
I will see if I can post some photos.
Our drawings came back from the engineers and they have designed external chainplates made from 12mm SS flat bar that is mounted onto thick plates of fibreglass (also on the outside of the hull). By doing it this way they have designed it so that we don't need to have backing plates - just large washers (hopefully eliminating the need to remove the old ones so that we can just cut them off below and seal up the deck totally above). Still waiting to see the bill for the design.... but we are happy!
email is sony_126@hotmail.com

Thanks again for sharing!
Sony126 is offline   Reply With Quote
Old 12-07-2018, 16:35   #9
Registered User

Join Date: Jun 2018
Location: New Zealand
Boat: Cavalier 32
Posts: 3
Re: Chainplate Cavalier 32

Here are a couple of photos from Feb when we had de-masted. The first one is our old backstay chainplate with the fracture just visible.
the other 2 (sorry I forgot to rotate them first) are of the starboard fwd lower shroud. I think I mentioned before that we are sure the fwd lowers had been replaced before as they are a different design to the others. Just a really long flat bar of SS bolted through the bulkhead and at a totally different angle to the stay. Although the stainless was in good condition they both definitely leak water down into the cabin and along the bulkhead so we were keen to redesign and remove asap.
Hope this all makes sense....
Attached Thumbnails
Click image for larger version

Name:	IMG_8703.JPG
Views:	34
Size:	283.7 KB
ID:	173483   Click image for larger version

Name:	IMG_8640.jpg
Views:	42
Size:	414.9 KB
ID:	173484  

Click image for larger version

Name:	IMG_8641.jpg
Views:	51
Size:	418.1 KB
ID:	173485  
Sony126 is offline   Reply With Quote
Old 12-07-2018, 18:16   #10
Registered User
 
Snowpetrel's Avatar

Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,919
Re: Chainplate Cavalier 32

Wow, lucky the backstay held together as long as it did!
__________________
My Ramblings
Snowpetrel is offline   Reply With Quote
Old 08-04-2019, 19:03   #11
Registered User

Join Date: Apr 2019
Location: New Zealand
Boat: Cavalier 32
Posts: 1
Re: Chainplate Cavalier 32

[QUOTE=brucesagnol;2635497]Hi - I am new to this forum and am hoping someone can help me with some information. I own a Cavalier 32 and had a chainplate fail while sailing. Inspection of the piece which has come out through the deck looks like it has been subject to both stress and corrosion. It appears that the chain plate rests against the inside of the hull and is glassed over. It has a knee where it exits the deck. I would be very grateful if any one could supply me with any information about removal and replacement of chain plates on this or similar type of yacht

Thank you

I have a Cav 32 and I'm looking for the same information. Did you remove yours? If so, did you find out how they were installed?
__________________

Petronnella is offline   Reply With Quote
Reply

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
Cavalier 26 southernman Monohull Sailboats 28 29-04-2017 18:10
Cavalier 39 Technical Information sailingsam Monohull Sailboats 15 14-03-2015 17:49
For Sale: Chris Craft Cavalier prochip2011 Classifieds Archive 1 10-07-2011 18:04
Cavalier 39 - Any Thoughts ? Johnathon123 Monohull Sailboats 6 21-11-2010 02:04
Man Sinks His Own ChrisCraft Cavalier Soundbounder Off Topic Forum 15 16-03-2009 16:24



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:09.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.