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  1. 22nd February 2009, 06:59 AM #1
    wsalter
    wsalter is offline New Member
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    Default GIS buttstrap question

    I've begun construction of a GIS and have a question about the directions for buttstrap placement on the sides. The plans call for the buttstraps to be held back 50mm from the sheer and chine lines. However, since the chinelog is 45 mm wide, and overhangs the chine by 10mm, shouldn't the buttstrap be carried to within 35mm of the chine? Likewise, the inwhale is 45mm, so shouldn't the buttstrap end at 45mm from the sheer? Admittedly the difference on the sheer is small, but I am concerned, especially at the chine about leaving the buttstrap short of the chine/inwhale and having a portion of the joint on the side panels unsupported.

    Thanks for and advice.

    Bill
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  2. 22nd February 2009 06:59 AM # ADS
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  3. 22nd February 2009, 07:44 AM #2
    MiddleAgesMan
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    I did it per the plans, figuring MIK calls for the straps to be a tad short so you have some wiggle room while fitting parts that follow. IIRC I needed that wiggle room in the bottom.
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  4. 22nd February 2009, 10:32 AM #3
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    Boatmik
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    Howdy Bill,

    MAM is spot on. It gives a little bit of space to move things around. I provide about the same gap with all my boats in plywood.

    There have not been any issues to date with any of the boats.

    However you are welcome to make the fits closer if you want, everyone does details a little bit differently. Though you may need a rebate plane handy to take a hairbreadth or three off as the boats fit together.

    It won't be an issue with the chinelog as you can move that to where you want. However the sheer clamp often needs quite a bit of fiddling space to get it perfect as eyeballs used well are always much sweeter for final details than the most accurate measurements in the world.

    The other place you will have to provide 2 or 4 mm of wiggle space is the centrecase space in the bottom panel buttstrap.

    Best wishes
    Michael.
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  5. 22nd February 2009, 12:38 PM #4
    CCBB
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    Bill, As Mik, says you can add a few mm to make a closer fit. But structurally, the joint is strong. Once that butt joint is locked into a monocoque structure and backed up by the neighboring chine log joint and the rest of the structure, that butt joint is not stressed at all. It is very strong even the several mm's w/o the strap.

    Clint
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  6. 22nd February 2009, 11:21 PM #5
    wsalter
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    Thanks for the replies. As usual I was maybe overthinking things just a bit...

    Bill
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