Repair hull indentation/flat spot? - SailNet Community
 3Likes
Reply
 
LinkBack Thread Tools
post #1 of 21 Old 12-16-2011 Thread Starter
Senior Smart Aleck
 
jameswilson29's Avatar
 
Join Date: Aug 2009
Location: Richmond, Virginia
Posts: 2,152
Thanks: 34
Thanked 70 Times in 65 Posts
Rep Power: 6
 
Repair hull indentation/flat spot?

There is a hull indentation/flat spot in the starboard bilge area of my P28, photo attached: SailNet Community - jameswilson29's Album: Winter repairs: hull indentation - Picture

The inside of the hull is currently inaccessible due to the hull liner. I could gain access by cutting ports in the starboard cabin berth locker.

Is this worth repairing?

I am considering trying to pop out the indentation and adding additional fiberglass laminate and stringers to strengthen the area.
jameswilson29 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 21 Old 12-16-2011
Member
 
raisin56's Avatar
 
Join Date: Jul 2008
Location: Tampa, Florida
Posts: 45
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
The real question is how did it get there?
Not knowing the history of the vessel I would suspect a repair by a PO that wasn't fared properly. I would strip the paint off down to the gel/glass and see what I find. A repair could be hard to detect if they were good a gel work, but if they were that good they should know how to fare the hull. Look for any stress fractures around the flattened area if it is not a repaired area. Glass doesn't "pop" like sheet metal on a car would, other means of repairing damage would be needed.
If you don't find any stress fractures and aren't planning on making it a fast racer the put on a new bottom coat and enjoy the sail.

Dan
raisin56 is offline  
Quote Quick Reply Share with Facebook
post #3 of 21 Old 12-16-2011
Junior Member
 
Join Date: Dec 2002
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
It might be damaged from hitting an object but I would not rule out improper keel support if the PO used jack stands. Nonetheless, I agree with Dan, if no serious damage, just verify, and don't worry about it.
Traveling Light is offline  
Quote Quick Reply Share with Facebook
post #4 of 21 Old 12-16-2011 Thread Starter
Senior Smart Aleck
 
jameswilson29's Avatar
 
Join Date: Aug 2009
Location: Richmond, Virginia
Posts: 2,152
Thanks: 34
Thanked 70 Times in 65 Posts
Rep Power: 6
 
Surveyor surmised it was the result of improper jack stand placement and recommended inspection by professional fiberglass repairer. I understand hull indentations are often found on Pearsons from this era because of combination of relatively heavy displacement and light construction aft of the cabin bulkhead.

I doubt it was previously repaired as there is no access to the area, except outside the hull.
jameswilson29 is offline  
Quote Quick Reply Share with Facebook
post #5 of 21 Old 12-16-2011
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,521
Thanks: 104
Thanked 309 Times in 299 Posts
Rep Power: 10
     
As you say, Pearsons are known for being what some call 'soft shell' boats and can suffer from this kind of indentation, usually from improperly placed pads/stands. Usually, though, they'll tend to pop back on their own once the force is removed.

The fact that this has not occurred makes me wonder if the laminate is fractured slightly in that area... that's kind of tough to be sure about, esp as the area is inaccessible from inside.. can you at least 'see' if the inner surface is intact? (not that that is any guarantee of the integrity of the area..) Any difference in the 'sounding' in that area and adjacent 'normal' appearing parts of the hull?

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Faster is offline  
Quote Quick Reply Share with Facebook
post #6 of 21 Old 12-16-2011 Thread Starter
Senior Smart Aleck
 
jameswilson29's Avatar
 
Join Date: Aug 2009
Location: Richmond, Virginia
Posts: 2,152
Thanks: 34
Thanked 70 Times in 65 Posts
Rep Power: 6
 
Sounds different to amateur...

Yes, I was rapping on it with the handle of the scraper I was using and it sounded different from the surrounding area, although it is difficult to tell because aft of it is a cabin bulkhead, below is the reinforced bilge sump area, forward is the main bulkhead...

I would have to cut into the liner to access this area for an inspection. I am not sure I would recognize the difference between damaged laminate and undamaged laminate.

Could I pop the area out using a jack between the hull and the liner or tapered wood pieces hammered into place temporarily?

Would there be any harm in adding laminate and stringers to reinforce this area?

(I did not intend for this to be a "project boat", although it seems to be becoming one; the boat is inexpensive enough I am hesitant to pay for professional fiberglass repairs.)

Last edited by jameswilson29; 12-16-2011 at 11:21 AM.
jameswilson29 is offline  
Quote Quick Reply Share with Facebook
post #7 of 21 Old 12-16-2011
Senior Moment Member
 
SloopJonB's Avatar
 
Join Date: Jun 2011
Location: West Vancouver B.C.
Posts: 11,371
Thanks: 59
Thanked 67 Times in 64 Posts
Rep Power: 5
 
Quote:
Originally Posted by jameswilson29 View Post
Yes, I was rapping on it with the handle of the scraper I was using and it sounded different from the surrounding area, although it is difficult to tell because aft of it is a cabin bulkhead, below is the reinforced bilge sump area, forward is the main bulkhead...

I would have to cut into the liner to access this area for an inspection. I am not sure I would recognize the difference between damaged laminate and undamaged laminate.

It's usually pretty obvious, likely you'll recognize it when you see it.

Could I pop the area out using a jack between the hull and the liner or tapered wood pieces hammered into place temporarily?

Yes - I wouldn't use a jack though - you might be able to pop it out by hand with a piece of broom handle or similar. Go easy at first and increase the pressure slowly, don't START by smacking it with a big hammer.

Would there be any harm in adding laminate and stringers to reinforce this area?

Nothing but good could come from this.

(I did not intend for this to be a "project boat", although it seems to be becoming one; the boat is inexpensive enough I am hesitant to pay for professional fiberglass repairs.)
ALL boats are "project" boats. It's just a matter of how much of a project they are.

P.S. If you do decide to cut into the liner, plan it carefully so you can make it look good later - like a planned and designed access port. Nothing screams "uncaring owner" quite like crude holes hacked in a moulded liner.

I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.

Last edited by SloopJonB; 12-16-2011 at 08:06 PM.
SloopJonB is offline  
Quote Quick Reply Share with Facebook
post #8 of 21 Old 12-16-2011
Senior Member
 
Tim R.'s Avatar
 
Join Date: Mar 2003
Location: Portland, Maine
Posts: 1,543
Thanks: 1
Thanked 27 Times in 26 Posts
Rep Power: 13
 
That vintage Pearson 28 does not suffer from any lightly built areas in the hull. In fact this is the first I have ever heard anyone say that this Model and vintage Pearson was anything less than well built. What are these claims based on?

This is likely not a deflection from an improperly placed boat stand. This is a poor repair. Once you strip it down to the glass you will be able to see what was done.

If it is a repair, then there is probably no gel coat where they did the repair. No reason to cover an epoxy based repair with gel coat just to be covered by AF paint. Gelcoat is cosmetic. Once you remove the paint, it should be obvious. Maybe it is a poor repair because they did not do any work from the inside. Where on the inside of the boat does this repair line up?

Tim R.
Out cruising
1997 Caliber 40LRC

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

-----------------------------------------------------

Last edited by Tim R.; 12-16-2011 at 08:38 PM.
Tim R. is offline  
Quote Quick Reply Share with Facebook
post #9 of 21 Old 12-16-2011
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,521
Thanks: 104
Thanked 309 Times in 299 Posts
Rep Power: 10
     
Prying against the liner would probably be a bad idea.. it may crack itself.

Jon's got a good point - cut into the liner in a way that you can install an inspection port so it looks OK afterward. If the laminate is damaged, once you get a peek you should see some surface splintering.. but the difficulty is that even if you don't it's no guarantee that there isn't internal fracturing.

Adding stiffeners or reinforcement may require (at least temporary) removal of most of that section of liner...

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Faster is offline  
Quote Quick Reply Share with Facebook
post #10 of 21 Old 12-16-2011 Thread Starter
Senior Smart Aleck
 
jameswilson29's Avatar
 
Join Date: Aug 2009
Location: Richmond, Virginia
Posts: 2,152
Thanks: 34
Thanked 70 Times in 65 Posts
Rep Power: 6
 
Pearson hull deflections

I am a big Pearson fan - this is my second Pearson. Nevertheless, I realize that every boat has its weak points, including Pearsons, which can suffer from hull deflections when improperly blocked. I do not blame Bill Shaw or Pearson for not anticipating boneheads working in marinas. If you search the internet for hull deflections/flat spots/indentations, Pearsons frequently come up as the subject vessel, usually one of the more popular models, such as the P30. Here is a previous instructive sailnet thread on the subject: pearson 30 1973

I have seen a number of others on different websites.

On my P29, the area is starboard aft of the keel forward of the aft cabin bulkhead. I may be able to access it under the sink or the starboard cabin berth locker. Here are some more photos: http://www.sailnet.com/forums/member...dentation.html .

I believe the thru-hull in the photos is the galley sink drain (icebox drains into the bilge).

Last edited by jameswilson29; 12-16-2011 at 09:29 PM.
jameswilson29 is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

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









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
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Black Rot Spot on Teak Bulkhead Repair dougshipl Gear & Maintenance 11 09-28-2014 10:07 AM
Cored deck soft spot repair sync Gear & Maintenance 80 08-01-2014 11:53 PM
Found soft spot on hull after putting on trailer dflyin1 Gear & Maintenance 11 02-18-2008 11:37 PM
Hull Hard Spot leading to Interior Refit Blueskyzephyr Sailboat Design and Construction 9 01-16-2008 04:44 PM
Flat Spot on Hull mathislaw1 Boat Review and Purchase Forum 12 01-19-2007 01:04 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