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  1. #16
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    Howdy Robert,

    I've put some pics of a beth building and one sailing on my first post in this thread so ppl can see what we are talking about
    http://www.woodworkforums.ubeaut.com...226#post649226

    No - you have it wrong! Probably my fault for being to verbose!

    1/ It is possible to build the bottom of the boat out of 6mm ply as per the plans without any additional bottom stiffening.

    2/ If using gaboon it is possible to use 9mm without increasing the weight of the boat. The bottom will weigh the same as that part of the original boat.

    Thanks for correcting my memory with the plywood for Beth.

    I think a good strategy is to ignore this discussion about longitudinal bottom stiffeners and build the boat without them. If there is a problem then it is pretty easy to add them later. If the bottom ply is 5-ply (5 layers) it will be much better than my original Beth anyhow!

    I would suggest using the lightest ply of good quality that you can get for the rest of the structure if you can't get gaboon.

    Best wishes
    MIK

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  3. #17
    Join Date
    Oct 2007
    Location
    Poland
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    Quote Originally Posted by Boatmik View Post
    1/ It is possible to build the bottom of the boat out of 6mm ply as per the plans without any additional bottom stiffening.
    Michael ,
    Thanks for all - I want to build bottom of 6 mm (5 layers) plywood wihout any additonal stiffening (You've written in your manual of Beth building plans -page no 8: "If skids are fitted to the bottom they should be a reasonably hard, long wearing timber, but must be kept small. My Beth has no skids and though the bottom flexes it has not effected the durability and doesdn't seem to effect speed.")
    Stop discussion about it.
    Aloha!
    Robert Hoffman
    http://robhosailor.blogspot.com/


  4. #18
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  5. #19
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    Quote Originally Posted by robhosailor View Post
    Marine plywood available in Poland:
    okoume - circa 460 kg/m3 ....but expensive but look there:
    http://www.sklejka-pisz.com.pl/144 (550-700 kg/m3!!!)
    spruce/pine (marine plywood) - circa 550-620 kg/m3
    alder (marine plywood) - circa 580 kg/m3
    beech (marine plywood) - circa 720 - 800 kg/m3
    oak (marine plywood) - circa 720 - 800 kg/m3 (to haevy... but excellent quality!)
    I have checked where from divergences in weight of okoume/gabon plywood are:

    Light one is probably okoume ply with okoume core layers (all layers are from okoume/gabon wood).
    Heavier ones are produced with core layers from other species of wood - only external layers from okoume/gaboon wood are.
    Aloha!
    Robert Hoffman
    http://robhosailor.blogspot.com/


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