[Public-list] Cockpit coamings.

[Jonathan Whittingham]

Tom S. wrote:

> Jonathan ..... As I read your comment on plywood coamings I conjured 
> up an imige of 5/8 inch CDX (construction roof sheathing). I have seen 
> hatch boards about this bad.
>
> It might be alright if you used a very high quarity marine grade 
> plywood with teak or mahogany veneer and covered all exposed edges 
> with solid teak or mahogany (matching the veneer) epoxy these edges 
> with splines or biscuits. Then finish with several coats of a prefered 
> varnish, Cetol, or such.
>
> I believe however by doing the above you would spend more time, more 
> money and experience more frustration then by just buying a good 
> quality teak or mahogany and reproducing thr original boards which 
> seem to be doing very well on most of these boats. My Alberg was made 
> in 1970 and I am sure these are the original coamings.
>
> I do plan on trying to remove them this summer and  refinish them. If 
> they end up getting damaged in this process I will use them as a 
> pattern and cut new ones from solid teak or mahogany (probably teak)


Deat Tom,
              Well. I am now rapidly moving back into the traditional 
camp. I have tracked some Honduras mahogany at a reasonable price( 
compared to teak). I still intend to support the ends with a cross peice 
under the traveller and probably expand the length of the winch bases. 
One question: How easy is it to bend the boards into the curve? Regards 
Jonathan.

>
> tom s
> A 30 412
> ----- Original Message ----- From: "Jonathan Whittingham" 
> <whittle at shaw.ca>
> To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
> Sent: Wednesday, December 21, 2005 8:29 PM
> Subject: Re: [Public-list] Cockpit coamings..
>
>
>> Tom S. wrote:
>>
>>> Plywood coamings?
>>> Ouch!
>>>
>>> tom s
>>
>>
>>
>>   Well, I knew that I would get some negative response to the 
>> suggestion below. Fair enough. However I would really appreciate an 
>> expanded argument regarding the use of high quality plywoods, 
>> especially if the coamings are finely edged and epoxied. My 
>> contention is that the existing design of the coamings is flawed in 
>> that the bending stresses encourage the splitting of the tailing 
>> section if sideways pressure is inadvertantly applied, which is 
>> precisely what has happened to mine. I would propose further heresy 
>> by attaching the tail ends to a cross piece of timber, which would be 
>> bolted to the deck area immediately behind the rear cockpit, thus 
>> protecting the timber from any side pressure stress. Perhaps,Tom, you 
>> could advise as to whether your "Ouch!" is relevant to form or 
>> function? Or both, perhaps. If so, I would much appreciate further 
>> elucidation on the matter. Regards Jonathan.
>>
>>>
>>> Jonathan Whittingham wrote:
>>>
>>>>    2. I am considering rebuilding the coamings out of marine grade 
>>>> plywood
>>>
>>>
>>>
>>>
>>>
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>>
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>
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