Vaccume baggin advice

Discussion in 'Boatbuilding' started by BSR001, Sep 23, 2008.

  1. BSR001
    Joined: Sep 2008
    Posts: 6
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    Location: PA

    BSR001 Junior Member

    Im building freestyle jetski hulls and im looking into vaccume bagging.however i have a few questions.right now my layup scheadule is where im happy with question is if i do the same layup and bag it im gonna loose some of my thickness.does that mean i also loose the rigidity of the part do to it being thinner or will it not be enough to notice.
    Also is polyester or vinylester resing baggable.thanks
    here is a few pics of my hulls
  2. TeddyDiver
    Joined: Dec 2007
    Posts: 2,589
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    Location: Finland/Norway

    TeddyDiver Gollywobbler

    Basicly getting rid of excess resin increases strength. About rigidity not sure..
  3. Guest625101138

    Guest625101138 Previous Member

    Panel rigidity is a function of the elastic modulus of the glass used and the thickness to the third power. So thickness is extremely important for gaining rigidity. If you are effectively using excess resin as a filler to increase thickness then you gain in rigidity for the amount of glass used.

    This is not the most effective way to gain rigidity because there are much lower density fillers but making a cored panel is a more complicated layup particularly if it is a complex shape.

    If you vacuum bag to reduce excess resin in the same glass schedule you should expect that the strength will be the same, the weight a little less and the panels considerably more flexible. The latter may be undesirable.

    Rick W
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