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Re: [Michalak] Re: Plywood thickness... What does it effect?

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  • Andre Basso
    Clear as crystal Anders ! Understood and agreed. All the best, Andre. ... [Non-text portions of this message have been removed]
    Message 1 of 46 , Aug 1, 2013
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      Clear as crystal Anders !

      Understood and agreed.

      All the best,

      Andre.

      On 01-08-2013 22:11, Anders Bjorklund wrote:
      >
      > Well, the discussion got sidetracked into some minute details that
      > probably
      > aren't worth clarifying. But I think you get the point I was trying to
      > make
      > (for some silly reason). If you use thicker plywood on the bottom of the
      > boat that is built over a defined internal framework, the extra thickness
      > increases the external volume of the boat. That generally increases its
      > available carry capacity. But the extra plywood also adds weight, which
      > reduces the carrying capacity. There should be a net gain, because plywood
      > is less dense than the water it displaces.
      >
      > I can see why the statement of mine that you quoted below caused
      > confusion.
      > But extra external volume could conceivably be added to the hull in an
      > area
      > that would never be submerged. Like on the transom, or high on the bow. In
      > that case it wouldn't increase the hull's carrying capacity. It would only
      > add weight, which would reduce the available carrying capacity. Does that
      > help to clarify anything Andre? It's really just a bit of trivia, anyway.
      >
      > Cheers,
      > Anders
      >
      > On Thu, Aug 1, 2013 at 6:33 PM, abasso5 <basso.asb@...
      > <mailto:basso.asb%40gmail.com>> wrote:
      >
      > > Maybe I have missed some messages on the subject. If it is the case
      > please
      > > forgive me.
      > >
      > > Could please comment further on that statement ?
      > >
      > > "Only the extra thickness that is submerged will increase the carrying
      > > capacity"
      > >
      > > On my thoughts the volume of water displaced is a function of the
      > external
      > > boundaries of the boat. Ideally, if we could build a boat with the
      > thinnest
      > > and lightest material possible (keeping that volume), the weight of the
      > > boat could be neglected and all displacement capacity would be for
      > carrying
      > > crew and loads.
      > >
      > > With this (maybe mis)conception in mind I see no way of building a boat
      > > with thicker plywood (that will replace air internally when compared
      > to the
      > > thinner plywood) and end up with larger loading capacity.
      > >
      > > Going further: If we keep the same interior volume, the thicker plywood
      > > will expand the external volume and therefore displacement. Assuming the
      > > material used floats, will enlarge carrying capacity for sure.
      > >
      >
      > [Non-text portions of this message have been removed]
      >
      >



      [Non-text portions of this message have been removed]
    • Scott Souder
      Well I appreciate all the feed back on the topic. Jim gave his blessing for the thicker bottom and the responses seem that the positive far outweigh the
      Message 46 of 46 , Aug 6, 2013
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        Well I appreciate all the feed back on the topic. Jim gave his blessing for the thicker bottom and the responses seem that the positive far outweigh the negatives. I think I've made up my mind.
        Thanks to all,
        Scott

        [Non-text portions of this message have been removed]
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