[Public-list] Rot in bulkheads beneath chainplates

[Mike Lehman]

Brian

What is your hull #?

On the liner boats (I own #505 and co-own #567) both liner boats. I have 
noticed that on a lot [most] of the liner boats there is a deflection right 
at the point where the forward knees are attached. This is most noticable 
when sighting down the cove stripe. I had that too on 505 but repaired it by 
pushing out the hull [with tension off the rig] and glassing in the 
horizontal shelves in the forward cabin. The shelves are secondary 
structural members, but since they wre pop-riveted in place, they did not 
provide much lateral support. While I was at it I strenghtened the forward 
knees.



Mike Lehman
~~~_/)_/)~~_/)~~~




----Original Message Follows----
From: Brian Hofler <bhofler at shaw.ca>
Reply-To: Alberg 30 Public List -- open to all 
<public-list at lists.alberg30.org>
To: Alberg 30 Public List -- open to all <public-list at lists.alberg30.org>
Subject: Re: [Public-list] Rot in bulkheads beneath chainplates
Date: Sun, 18 Feb 2007 16:06:15 -0800

Is that why I have a depression on one side of the hull? The knees currently
do not fit tight to the underside of the deck. I assumed that it was to
prevent any obstruction between the hull and the deck when bonding the two
together. No sense in creating a hassle when in production mode - better to
leave the knees short and fully encased in fiberglass. Having said that...If
I release some of the tension on the shroud, release the rivets on the
bulkhead, use a jack and timber to carefully push the hull out, fill in the
knee to the deck and rebuild the structural flange to the bulkhead...do you
think that the hull will recover it's fair shape and overall produce a
stronger attachment point for the chain plates in that area?...I think I
have answered my own question...looking for support...

Brian

-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org]On Behalf Of George Dinwiddie
Sent: Sunday, February 18, 2007 1:12 PM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-list] Rot in bulkheads beneath chainplates

Rachel wrote:
 > On Feb 18, 2007, at 1:15 PM, George Dinwiddie wrote:
 >
 >>   Glassing in new knees should be relatively
 >> straightforward.  You might want to make them longer, at the same time,
 >> to spread the load over a larger contact with the hull.  Be sure to
 >> make
 >> the knees butt tightly against the underside of the deck.
 >
 > George,
 >
 > Just curious why you specify that the knees should butt tightly up to
 > the deck?  I know that, for example, on the Triton, the knees are an
 > inch or so shy of the deck on purpose.  I would think that you would
 > want all of the upwards stress on the hull and not the deck.  Now I'm
 > not saying that they can't get anywhere near the deck, but (and maybe
 > I'm missing something here), I wouldn't think that it would be
 > something to necessarily strive for.

Because if there's space, the knees will pivot to fill it, pulling in on
the sides of the hull.

--
   ----------------------------------------------------------------------
    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.
                 'The Middle' by Ogden Nash
   ----------------------------------------------------------------------



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