Hard points question

Discussion in 'Fiberglass and Composite Boat Building' started by fallguy, Aug 3, 2017.

  1. fallguy
    Joined: Dec 2016
    Posts: 1,756
    Likes: 94, Points: 48, Legacy Rep: 10
    Location: usa

    fallguy Senior Member

    Any concern over developing hardpoints with this schedule:

    Exterior to inside-
    22 oz triax n epoxy
    12mm M80 corecell
    22 oz triax n epoxy
    bulkheads (no pads planned) 6", 6", 8" tapes (bulkheads are 18oz biax n epoxy both sides)

    Designer is not too worried about it since there is 44 oz of fabric.
    Post cure is planned, which might help.

    Please don't post the picture with the pads, I already know the convention, but I didn't do the drawings and I'd have to revise the drawing/cutouts for any padding and I don't have enough experience to argue with the designer. I just want some expert opinions. And thanks.
     
  2. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    It might help to mention what boat is planned.
     
  3. jorgepease
    Joined: Feb 2012
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    Location: Florida

    jorgepease Senior Member

    Yeah if it's a dinghy no big deal otherwise 22 oz of glass isn't going to prevent hardpoints, a nice big fillet will help though.
     
  4. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    The foam core should prevent the bulkhead from creating a hard spot.
     

  5. Mr Efficiency
    Joined: Oct 2010
    Posts: 7,408
    Likes: 234, Points: 63, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    I'd prefer to see at least a tapered thickening of the inner skin at the point of intersection with the bulkhead. But as jorgepease says, it won't matter too much for a small, light boat, unless there is high impact loading. And if the hull is strongly curved longitudinally, it will matter less.
     
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