Tabbing

Can anyone help me with 2 items on a new (1980) sailboat for me. The tabbing inside the wet locker (this is of the same area as a bulkhead) of my pearson 26 has come undone. Any suggestions for a repair would be great.
Part two, there appears to be stress cracks in the same location outside of the hull on both sides of the boat. The boat was marked with lift marks at the same location which is also around where the stantions are. I want to try to add support to the inside of the hull but am confused. Should i add support vertical or horizontal on the hull insides or any other thoughts. SHould i epoxy something to the hull to do this or will that add a "hard spot"

 

Is it comming free of the bulkhead or the hull?

 

I will try to answer this correctly. The material has come off of the hull, so the remaining tabbing is still attached to the bulk head area. I can just get my fingers between the space of the hull and the bulk head. It is my understanding that a space should be there.

 

Has the tabbing itself failed (torn) or has it just come away from the the hull glass leaving an "L" shape? Is it all around the bulkhead (I assume it is the aft wet locker/mast compression one) or just one spot? Both sides? Is there any indication of a grounding, or falling off a stand, or hull compression?

Stress cracks on the outside skin in way of the bulkhead brings some questions. Any history?

 

The tabbing has come away from the hull and has left a L shape as you have said. It is the aft wet locker, i did not recall seeing it on the port side. The is no indication of grounding and it has been on a cradle. The stress cracks look as if they are just in front of the bulkhead area. They are very specific in one location but on both sides of the boat. They are more so on the starboard side, the same side that the tabbing is coming off. I have pictures but do not know how to get them on this forum.

 

http://www.boatdesign.net/forums/faq.php?faq=vb_read_and_post#faq_vb_attachment_explain

 

Take your time with this repair..

DREW,
While you do need to work out a repair, consider the following;
The bulkhead is normally fitted while the hull is still in the mould!
If you now have a 15mm (finger width) gap between between the hull and the bulkhead tabbing the hull must be seriously out of shape...I would be surprised if this (bulge) isn't visible from the outside.
It most certainly will be once you get a new shiny paint job after repairs.
I would be working out what has happened to the hull and try to relieve it so that the hull can go back to shape...this may mean grinding off tabs in the area....this I regard as important... the repairs are secondary and will be straight-forward...you will not get it perfect but the hull deserves your best effort...and every subsequent owner will curse your name if you botch the job.
I would use epoxy and CSM to effect repair...the epoxy has good adhesion to the old surface. Polyester resin, as you can see doesn't hold that well.
Your tabs sound a bit light on.
Each angle should be 2400gm/squ metre for 12mm-22mm ply...and be full thickness to 50mm and tapered out at not less than 20mm per 600gm of glass or 1 in 20 on thickness.
Need to see pictures for a better analysis.
Take your time with this one.
Cheers
Rob.

 

I get confused as to what is considered the "bulk head". This problem is in a locker in which i consider the inner skin of the boat is attached to the hull. As I have seen web sites where people "remove" bulkheads for repairs, this is not attacted to any wood bulkhead. Will attach pictures.

 

Bulkhead or furniture?

DREW,
A bulkhead is a major structural part of the hull, it can be longitudinal but is usually transverse.
The Bulkhead is a partition in the hull, (not necesarily watertight) that is essential to the rigidity of the hull.
A hull (skin) on it's own is unlikely to have enough strength to withstand all the forces on it....so designers add bulkheads, stringers, ring frames etc...
If what you have is cupboard side that has popped off the hull it's not anywhere near the problem I was concerned about.
I remember a few years back...about 15... when a local "french" imported charter boat pushed into a bit of heavy weather. The word was all the interior furniture in the fwd sections popped off the hull. This is not unusual...the tagging as you call it..while it may be sufficient to hold furniture it won't take the loads the skin can put on it.
Not sure what you mean here...
Quote "the inner skin of the boat is attached to the hull"
Cheers
Rob.

 

Only a guess.

The boat was lifted with the straps misplaced. Error to the side ot the bulkhead where the locker is on. The pressure from the strap flexed the hull, there by poping the locker loose, and creating cracks in the outside of the hull in the same area.

Pictures would help.

Maybe: clean out the broken joint by passing a rolled up piece of cloth backed sand paper thru and along the crack. See if the joint can be easily pushed up tight and back into position. If so, stick it with epoxy, prep the old fillet and add a few more layers of biaxel glass tape.