[Public-List] Bulkheads

[Mike Lehman via Public-List]

I have found that the dimples in the sides of the hull at the forward lowers 
in the liner boats (which is quite noticeable when you sight down the cove 
stripe), is due to the fact that the shelves in the forward cabin were not 
glassed to the hull (like they were in the older boats), rather they were 
pop-riveted to a horizontal flange. I removed my forward shelves in a 
collision with another Alberg so I had to reinstall them. I did so by 
relieving the tension on the forward lowers and then pushed the hull back 
out to the original position and then glassed in the forward shelves. These 
are secondary structural members and help to support the knees and the hull.

-----Original Message----- 
From: George Dinwiddie via Public-List
Sent: Saturday, February 06, 2016 9:57 PM
To: Chip Dance ; Alberg 30 Public List -- open to all
Subject: Re: [Public-List] Bulkheads

Chip,

If you look at most newer boats, there are dimples in the topsides where
the knees are attached. This is due to the knees not being flush with
the underside of the deck, and as the chainplate pulls the knee up, it
rotates slightly and pulls the hull inwards.

I think it would be best if the knee were flush with the underside of
the deck. I've thought about inserting shims, but have never done so.

  - George #543

On 2/6/16 7:26 PM, Chip Dance via Public-List wrote:
> I think someone, earlier in this thread, mentioned the knees supporting 
> the
> deck (or something along those lines). I'm curious about this. on #456 it
> appears as though there was a liner around the knees that was cut out by a
> PO, but from what I can tell, the knees don't appear to ever have been in
> contact with the deck, or even the liner. Can anyone shed some light on
> this for me?
> Since I will be rebuilding the knees, is there any concern with tabbing 
> the
> knees to the underside of the deck? Is flexibility between the deck & the
> hull a necessity?
>
> The link below shows a photo of what I'm talking about.
>
> https://www.dropbox.com/s/erhr89fwfju6ikm/SAM_0896.JPG?dl=0
>
> Thoughts?
>
> Chip
> #456

-- 
  ----------------------------------------------------------------------
   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.                          also see:
                'The Middle' by Ogden Nash     http://idiacomputing.com
  ----------------------------------------------------------------------



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