Vacuum Infusion Advice

Discussion in 'Fiberglass and Composite Boat Building' started by GreenFreak, Dec 3, 2019 at 11:38 AM.

  1. GreenFreak
    Joined: Tuesday
    Posts: 1
    Likes: 0, Points: 1
    Location: Petawawa

    GreenFreak New Member

    Hello,

    I'm planning to make a Composite Whitewater Kayak as a hobby project and am looking for some advice. The boat I'm planning to make is very small, ~6'L x 2'W x 1'H. very similar to: PROJECT X 56 - BlackOut https://www.wavesport.com/en/products/project-x-56-blackout

    From the research I've done, vacuum infusion seems to be the way to go, although does have some quirks.

    My main question is around the need to use flow media in areas where I will have a foam core?

    The bottom of the boat is fairly flat though there is a small amount of curve both front-back & side-side and will be using a Corecell M80 Contour Scrim 6mm foam knife cut in 1 3/16" squares in this area.

    My layup will be:
    Vac-Bag
    ?Flow Media?
    Peel-Ply
    11oz Carbon Twill
    Foam Core
    11oz Carbon Twill
    11oz Carbon Twill
    Mold

    My concern is that if I use flow-media, the epoxy will flow too quickly across the top of the stack trapping air/not fully wetting out the tool side of the stack. Though the concern with not using it is that resin will travel too slowly, not filling the part before it gels. Trying to get a feel for folks experience with resin traveling through contour scrim foam.

    I'm planning to use Pro-Set Infusion Epoxy INF-114 with Extra Slow Hardner INF-213 which has a 500g pot life of 175 minutes @ 25C, viscosity of 325cP, and an approx working time of 10-hrs. I'm estimating a need to use ~2 gallons of epoxy so will likely be mixing in batches larger than 500g.

    I'm hoping with the rrreeeaaallllllyyy long working time I can get away without flow media in the areas where I have foam to help ensure full wet-out.

    Thanks!
     
  2. Hafidd Ali Omer
    Joined: Oct 2019
    Posts: 2
    Likes: 0, Points: 1
    Location: Yemen

    Hafidd Ali Omer New Member

    please advice where to put the resin in spiral tube over or beneath the peel ply ?
     
  3. fallguy
    Joined: Dec 2016
    Posts: 2,140
    Likes: 143, Points: 63, Legacy Rep: 10
    Location: usa

    fallguy Senior Member

    Who spec'd that layup?

    it seems a bit .. incongruous re: elongation

    I don't profess to be an infusion expert, but I was told I had to use media if the foam didn't come with channels for the resin..Gurit has a great tech line. I suggest you call them. They are exceptional. It must be noted; I opted to wet bag.
     
  4. ondarvr
    Joined: Dec 2005
    Posts: 2,030
    Likes: 153, Points: 63, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    What material is the wave sport kayak made from.

    And where did you get the info to build it with the materials you mentioned?
     

  5. fallguy
    Joined: Dec 2016
    Posts: 2,140
    Likes: 143, Points: 63, Legacy Rep: 10
    Location: usa

    fallguy Senior Member

    If you hit a rock with that layup; your carbon will probably break and delam most likely because the Gurit is able to elongate while the carbon is not.

    You want elongation properties to match better. I am guessing here without researching your elongation numbers and with my general, but limited, knowledge.

    Roughly speaking, I'd say your Gurit is about 8% and the carbon less than 2% on memory and guessing. Not sure on your resin; probably 6% before any post cure, but a total guess.
     
    Last edited: Dec 8, 2019 at 12:12 AM
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