What core material

Discussion in 'Materials' started by hardguy007, Dec 14, 2025.

  1. hardguy007
    Joined: Jul 2012
    Posts: 49
    Likes: 2, Points: 8, Legacy Rep: 10
    Location: Ballymoney

    hardguy007 Junior Member

    Hi,

    I’m building a single outboard pod and swim platform. Will be laid up separately and then bonded together.

    My plan for the layup of the pod is

    Gel
    300csm
    Cure
    2x450csm
    1st layer of ply (where ob bolts on)
    Cure
    1x600 woven roven & 1x450csm
    2nd layer of ply (where ob bolts on)
    Cure
    1x600 woven roven & 1x450csm
    Final layer of ply (where ob bolts on)
    Cure
    2x45o csm
    Cure
    Flowcoat


    For the swim platform I’m planning

    gel
    1x450csm
    Cure
    1x450csm
    1x600 woven roving
    Cure
    2x450csm
    Cure
    Flowcoat

    My question really is will I need any core material in the swim platform?

    I’ve suggested the layups above as that’s materials I’ve got here at the minute. Do they look suitable?

    thanks
     
    hardguy007, Dec 14, 2025
    #1
  2. TANSL
    Joined: Sep 2011
    Posts: 7,984
    Likes: 955, Points: 123, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    With that information, it's not possible to know if you need to install a core. What I can tell you is that I would place the CSMs close to the neutral axis, and if you need RWs, place them far from the neutral axis. Where you've placed them, they lose a lot of effectiveness.
     
    TANSL, Dec 14, 2025
    #2
  3. fallguy
    Joined: Dec 2016
    Posts: 8,595
    Likes: 1,986, Points: 123, Legacy Rep: 10
    Location: usa

    fallguy Boat Builder

    Gonna be pretty flimsy.

    Why are you putting glass between plywood layers on the transom?
     
    fallguy, Dec 14, 2025
    #3
    TANSL likes this.
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