[Public-list] Mast step repair

[George Dinwiddie]

Putting brain in gear, since it's a newer boat, it's not the beam itself 
that's sagged, but the bulkheads that hold it up.  Sometimes they're not 
cut to fit snugly in the lower liner, and sometimes the liner itself has 
sagged.  If either has happened, I would fix that problem, first.

If only the cabin top has sagged, at the aft end of the step because the 
beam is at the forward end of the step, then probably jacking the deck 
back into place before recoring will be sufficient.  The strength of the 
stress-skin pannel formed by frp bonded on each side of the core is what 
holds the mast up; the inner liner is not structural.

I recall Read Beigel describing how he built a new oak stiffener for the 
port head bulkhead that was wider at the top, extending aft from the 
bulkhead, to provide extra support.  I don't remember what boat that was 
for.

  - George

George Dinwiddie wrote:
> Peter,
> 
> If your liner is bulging, then the deck has sagged significantly. 
> Probably that means that the beam has sagged.  Once you repair that, 
> jacking it back to it's original place in the process, the sag in the 
> liner should go away.  Possibly it will need a little help with a jack, 
> but it should go back.  I don't think you need to epoxy it to the 
> underside of the deck, as it wasn't done so originally.
> 
>  - George
> 
> Peter Amos wrote:
> 
>> I am clear in my mind how to go about the topside procedure for this
> 
> project but not so sure about fixing the bulging liner below.Two methods
> seem possible,drill some holes in the GRP below the core and pump in
> some thickened epoxy,then jack up the liner so that it spreads out ,then
> carry on with the topside work.Alternatively finish the topside
> work,remove the jack,drill some holes in the liner from below pump in
> epoxy and jack the liner up again.In both method the liner is bonded to
> the deck GRP.Am I looking at this the right way?
> 

-- 
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   When I remember bygone days                         George Dinwiddie
   I think how evening follows morn;            gdinwiddie at alberg30.org
   So many I loved were not yet dead,           http://www.Alberg30.org
   So many I love were not yet born.
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