[Public-list] Cockpit coamings.
Jonathan Whittingham
whittle at shaw.ca
Fri Dec 23 09:00:10 PST 2005
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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