[Public-List] Strengthening Soft Bulkheads.

[Jonathan Bresler via Public-List]

Noodling on this a bit
Guessing that

   - the bolts through the bulkhead resist the upward pull of the shrouds.
   - the end of the bolt at the chainplate is being pull upwards
   - the structure of the bulkhead has to resist the upwards pull
   - the incompressibility of the bulkhead is what provides the resistance
   - might be good to obtain a piece of G10 that extends the length of the
   chainplate plus a bit, laminate the G10 to the bulkhead, through bolt the
   chainplate to the G10 and the bulkhead.
   - at that point, guessing that it would be the G10 that is resisting the
   upwards pull rather than the bulkhead, and the G10 is transferring that
   force to the portion of the bulkhead that the G10 is laminated to.
   - punkiness in specific small areas of the bulkhead would not matter as
   the G10 is laminated to a much larger area and that area as a whole would
   have to fail for the G10 to move.
   - might be good to do this two shrouds at a time with the chosen pair of
   shrouds fully loosened.

Thoughts ?

Jonathan

On Thu, Jan 28, 2016 at 6:21 PM, Wes Gardner via Public-List <
public-list at lists.alberg30.org> wrote:

> And of course, the disclaimer - only you can evaluate the effectiveness of
> any repair vs. replacement and as Jeff points out, how well you'll sleep at
> night. :-)
>
> Sent from my iPhone
>
> > On Jan 28, 2016, at 5:24 PM, Michael Connolly via Public-List <
> public-list at lists.alberg30.org> wrote:
> >
> > Hi all,
> >
> > The Lorrie Rose has many problems among them bulkheads which are suspect.
> >
> > She has wood-grained Melamine laminated to her primary bulkheads.
> Tapping with a small hammer in the vicinity of the chain plates produces a
> hollow sound. I suspect at minimum the laminate has detached from the
> plywood substrate.  There is relatively little apparent water damage in
> this area, but there is evidence of water intrusion.
> >
> > I plan to remove the chain plates and peal back or lift off the Melamine
> where it has delaminated, revealing the condition of the plywood beneath.
> >
> > My question to those on the list is.  If there is no wholesale rotten
> plywood, i.e., delaminating plies, missing pieces or punky holes but
> perhaps some soft or tender but intact plywood, would it be possible to
> consolidate the exposed plywood with some sort of penetrating epoxy
> product?  Git-rot (R) comes to mind.
> >
> > I would most likely redo the tabbing to the hull and deck.  Perhaps
> lay-up some epoxy saturated fiberglass cloth to the consolidated surface of
> the bulkhead. In other words, if the damage is not extensive or covering a
> large area, can the bulkheads be repaired/strengthened without wholesale
> replacement?  Has anyone attempted to do this in lieu of replacing the
> bulkheads?
> >
> > Thanks for your thoughts,
> >
> > Michael #133
> >
> >
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-- 
Jonathan M Bresler
Alberg 30 #262
Annapolis/Eastport MD