[Public-list] Cockpit coamings.

[JOHN GRAVES]

Jonathan,
My cockpit coaming split in the same place. Mine is made of solid mahogany. I don't know if it is original or not. I plan to replace it in the future but I haven't decided of what material.
What have you found in high quality marine plywoods? I work at a container port and I have noticed around the container maintainence area a really heavy duty industrial plywood that they use to repair the floors of containers. It looks to be really strong. It has to be very strong because they have to withstand the weight of the cargo that can be many tons and the weight of the forklifts rolling in and out loading and unloading. It is also exposed to being soaked down by seas at times. When I get a chance I'm going to try to track down the source for this material. I am going to have to replace the bulkhead between the V-berth and the head and gearlocker. The one with the main beam over it that supports the mast. I want to use something that is bomb proof because the support of the mast is one of the most critical part of a sailboat.
John (Trelawney #15)
  ----- Original Message ----- 
  From: Jonathan Whittingham<mailto:whittle at shaw.ca> 
  To: Alberg 30 Public List -- open to all<mailto: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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