Recent content by abourgault

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    Thermo forming foam core

    In that video, starting at 44 sec., you see how Falcon catamaran does it.
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    Aluminum vs carbon steel for supporting chainplates / shroud load calculation

    An aluminum beam with the same dimensions (height, width and thickness) as your steel beam will deflect 3 times more under the same load. If you want the same deflection you have to increase it's moment of inertia. If you have enough room you can use a beam with more height to achieve the same...
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    Cutting core cell

    The best way I can see would be using a hot wire with a guide on each side of the sheet. The sheet would have to be backed by a plywood sheet to remain flat in each direction to work. I've not try that though.
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    General Infusion Strategies

    You can heat the core to make it conform to the curvature. If the core is of the plastic kind.
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    Repair to a daggerboard

    Thanks every one for the help. I was hoping thast just filling the hole would be sufficient and from your comments that's what I will do. AB
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    Repair to a daggerboard

    I understand what you are talking about but it's not the case here. The location of the hole would leave only 6 inches of board protruding under the hull. There's no gelcoat in the hole. It has been drilled afterward and the main reason is there's no such hole in the other daggerboard and I had...
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    Repair to a daggerboard

    Thanks PAR. I was hoping that it would be that simple. AB
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    Repair to a daggerboard

    Hi all, I have bought a beach catamaran that had a daggerboard in which a 5/16 hole has been drilled. The board protrude about 39 inches under the hull and the hole is at 10 inches under ther hull. The transverse location of the hole is at about the middle of the board. the maximum...
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    Epoxy over laminating polyester.

    If you spray PVA (polyvinyl alcool) over the tacky polyester it should fully cure. After it's cured, clean with water.
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    Foam core sandwich question

    I would say it depends on how it is loaded. To illustrate that, imagine the vertical portion is fixed and the load induce a upward bending on the top horizontal laminate. The skin under that top laminate will get in tension and could delaminate from the vertical foam. If that happen, the...
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    Porosity in gelcoat applied with a roll

    On the hull after a repair. I have applied it with a roll and it went fine. Lot of sanding but otherwise it has been ok.
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    Porosity in gelcoat applied with a roll

    Hi, I have read that if gelcoat is applied with a roll it will be porous. Will the porosity be through the whole thickness or just to the surface? If it's through the whole thickness what's the point of using a roll. Is it better to apply it with a brush? Thank you, AB
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    Repairing dent in foam cored hull

    Par, The size of the dents are specified in my 2 post. Mr Efficiency, the core seems to be divinicel. The boat is a Nacra Inter 18. Maybe some one knows the kind of foam they used.
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