[Public-List] Bulkheads

[Chip Dance via Public-List]

George,
It is difficult for me to visualize the twisted knees and dimples. I've
looked through many of the pictures in the gallery, but haven't seen
anything that looks like what you are describing. Could you point me
towards one?

Thanks
Chip

On Sun, Feb 7, 2016 at 1:42 PM, George Dinwiddie via Public-List <
public-list at lists.alberg30.org> wrote:

> 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
>>>
>>
>>
> --
>  ----------------------------------------------------------------------
>   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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