[Public-list] Cockpit coamings.

[Tom S.]

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)

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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