Fiberglass strength

Discussion in 'Boat Design' started by Ron Skelly, Mar 1, 2014.

  1. Ron Skelly
    Joined: Nov 2009
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    Ron Skelly RonS

    I plan to glass 3 layers of #6 cloth to my 13 foot long "foam" boat prototype.
    Are there any specifications/formulae on the strength this glass and solid foam this boat will deliver? From tests on the model it seems to have lots of strength to handle a summer of testing while carrying 1 or 2 adults.
     
  2. Mr Efficiency
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    Mr Efficiency Senior Member

    Are you using epoxy resin ?
     
  3. Ron Skelly
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    Ron Skelly RonS

    Yes and it works good on foam.
     
  4. Mr Efficiency
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    Mr Efficiency Senior Member

    I'd guess it all depends on what rigours you intend to put this boat through, but it sounds like the kind of laminate used where light weight, even ultra light weight, is required. Your project needs to be assessed in its entirety, with consideration to what kind of vessel and what its intended use is, before any meaningful assessment can be made of the adequacy of the lay-up. What suffices on the local duck-pond may be a hazard elsewhere.
     
  5. tom28571
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    tom28571 Senior Member

    An equal weight single skin of biax or triax will be stiffer and stronger than the woven glass. The issue would be fitting to
    compound surfaces.
     
  6. Ron Skelly
    Joined: Nov 2009
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    Ron Skelly RonS

    Triax/biax

    Thank you Tom...Do you think one layer of trimax would be sufficient? Would this be equal to 3 layers of #6 cloth - are there any fiberglass strength guidelines/formulae's that you are aware of?
     

  7. rwatson
    Joined: Aug 2007
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    Location: Tasmania,Australia

    rwatson Senior Member

    Ah - Ron, here you are on the big version of your weight issues.

    You are a bit short of details though. I am betting you are planning a solid foam hull.

    If you do, you are going to find it very heavy once glassed, compared to a hollow hull.

    However, as soon as you go hollow, the thickness of the hull will have a considerable affect on the fibre thickness required.


     
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