[Public-List] Bulkheads

[George Dinwiddie via Public-List]

Yeah, that too. The shelf should be a stiffener. The shroud pulling the 
inboard edge of the knee upward until it hits the deck causes a 
significant inward pull on the lower part of the knee, causing it to 
rotate if it's allowed.

  - George

On 2/7/16 3:36 PM, Mike Lehman via Public-List wrote:
> 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
>

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