GOP Home Build

Discussion in 'Boat Design' started by schultzfactor, Oct 25, 2013.

  1. schultzfactor
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    schultzfactor Senior Member

  2. Mr Efficiency
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    Mr Efficiency Senior Member

    OK, 5 metres.
     
  3. schultzfactor
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    schultzfactor Senior Member

    Ok so you mean I should insert a 5meter centre hull?
     
  4. Mr Efficiency
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    Mr Efficiency Senior Member

    No, I was just interested in the overall length of the boat. What do you expect the finished boat to weigh, less engine(s) ?
     
  5. schultzfactor
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    schultzfactor Senior Member

    300kgs maybe. Its probably around 200 now. I can still lift the transom relatively easily.
     
  6. Mr Efficiency
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    Mr Efficiency Senior Member

    That is extremely light, I would have concerns it can withstand the rigours of use.
     
  7. schultzfactor
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    schultzfactor Senior Member

    The construct is 3mm Ply with 2 layers of 600GSM Biaxial Fibreglass plus one layer of 200GSM glass on the outer hull. All sheets of FG are overlapped by about 100mm so these lines have four layers of 600GSM. Once it is turned I will fibreglass all inside joins with 600GSM Biax strips. And cull as much Redundant timber as I can. After this, reassess, and add additional scantlings if required. I will then install the Deck which is going to be 7mm Ply with 600GSM Over top. I will then drill into the deck and pour in expanding foam. After which the idea is to install the centre console with the petrol tank inside the Centre Console. Is this understrength, if so i might need to add more layers of Glass?
     
  8. Yobarnacle
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    Yobarnacle Senior Member

    The foam will add a fair amount of strength. If it's the hard yellow polyurethane. I have used foam and expanded steel mesh to temporarily repair 600 foot ocean barges.
    Longitudinal strength might be an issue. You might ask the engineers and architects here, what additional internal structure would insure sufficient strength. The additional weight might be minimal. A laminated box girder keelson inside the length of each hull maybe.
    Scantlings refers to the size and thickness of timbers. Heavier scantlings means more robust frames and thicker skin, for example. In what sense were you using the phrase "add additional scantlings if required"? Not criticizing, just trying to understand your intent.
     
  9. schultzfactor
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    schultzfactor Senior Member

    No worries yobernacle I wasn't sure if this was the right context, thanks for the correction.
    Yeah it's the hard Aerofoam I think it's called.. I thought scantling a referred to the bracing in the hull. I would have called it cross members?
     
  10. Yobarnacle
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    Yobarnacle Senior Member

    Frames, bulkheads(walls), deck beams, floors (deck beams in bottom of boat), go athwartship (side to side).
    Keel, keelson, kingplank, longitudinals, harpin, strakes, run fore and aft.

    I may have left out a couple structural members. :)
     
  11. schultzfactor
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    schultzfactor Senior Member

    HeHe yeah man, cant keep up with all the jargon.
     
  12. Yobarnacle
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    Yobarnacle Senior Member

    Takes awhile to learn the correct names of stuff.. But boats are different from items built for use on land. They are used in a completely different environment. so of course they are built differently than houses. Boats have unique parts with unique names.
     
  13. schultzfactor
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    schultzfactor Senior Member

    The Hope

    This is what I'm aiming for.
     

    Attached Files:

  14. schultzfactor
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    schultzfactor Senior Member

    Compression Tunnel

    What if, I built a stepped tunnel. Utilising the center pod and creating a pressure tunnel aft.
    Theory: with the rapidly decreasing tunnel size, would this create an increase in air pressure and induce lift?
     

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  15. JRD
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    JRD Senior Member

    Maybe - but it will also add quite a lot of drag too.
     
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