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Thread: "1290" Class M Hard Multi Chine Hull

  1. #21
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    Default Re: "1290" Class M Hard Multi Chine Hull

    Sanding of plug completed.
    A lot of very fine dust, hope the vacuum cleaner will not suffer too much !!
    Cleaning with dry tissue only. No water !
    Next, coverage with packing tape.
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  2. #22
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    Default Re: "1290" Class M Hard Multi Chine Hull

    Packing tape applied, one layer only.
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  3. #23
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    Default Re: "1290" Class M Hard Multi Chine Hull

    While waiting for better weather conditions, lower RH, here a 'dual table' about Sail's & Rig Data used for a Class M model.
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  4. #24
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    Default Re: "1290" Class M Hard Multi Chine Hull

    Before lamination and for precautionary reasons, I have applied two layers of Wax.

    Today I manage to laminate "Wet on Wet" 3 glass - epoxy layers.
    1 of 85g/mē
    2 of 105g/mē.
    Notice the second layers just laying on previous laminated one of 85g/mē without adding any epoxy.
    The 2nd layer is acting as a sponge absorbing the excess of resin like a "peel-off" tissue.
    No need to add too much resin, just what it is needed to cover the full surface.
    This is the way I use to keep the overall weight inside the rule of thumb : 50/50.
    Similarly for the 3rd layer.

    According to my calculations the hull surface is of 40.50dmē, therefore :
    (0.85g/dmē + 1.05g/dmē + 1.05g/dmē) x 2 for resin = 5.9g/dmē x 40.50dmē of hull = 238.95g .

    238.95g is the expected weight of the bare hull out of mold.
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    Last edited by claudio; 03-26-2017 at 01:44 PM.

  5. #25
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    Default Re: "1290" Class M Hard Multi Chine Hull

    Removed the excess of glass-epoxy and let now cooking under the sun !!! Close to the Canal du Midi (construction 1666- 1681), and for those who like to knows more : https://en.wikipedia.org/wiki/Canal_du_Midi
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    Last edited by claudio; 03-27-2017 at 07:47 AM.

  6. #26
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    Default Re: "1290" Class M Hard Multi Chine Hull

    the Sun is gone and cloudy and windy again !!

    Although only 24h are gone, being impatient, I decided to de-mold the hull with the help of tiny fiberglass blades and hull got away without problems.

    The Master is still perfect !

    The bare hull weight is 259g instead of 238.95g. Too much resin ? Probably yes but less then the budget allocation !

    Now is arrived the moment to draw and cut the hollow shadows to allow hull "setup" assembly.
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  7. #27
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    Default Re: "1290" Class M Hard Multi Chine Hull

    Claudio,

    Coming along quite nicely. Looking good!

    Seeing your work makes one want to start another boat project.

    Cheers,
    Clark

  8. #28
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    Default Re: "1290" Class M Hard Multi Chine Hull

    Hi Clark,
    apparently I'm progressing without troubles except weather conditions.
    Also happy that the balsa mold came out in perfect shape, there was some fear at the begin.
    The basic idea to post my "build logs" is to let others to do similar things.
    My work is often an experimental one. If the results are good then I can think about a racing model of the kind.

    After reading some papers about the performances of a Chine Hull, I decided to make one model to verify what learn.
    In the past I did the "Delta Rig" based on 4 panels, a way to make a hull rapidly since the hull was not my major concern at that time.
    Today I have chosen a 6 panels Chine Hull after various considerations, in spite of the difficulties to draw a 6 panels hull, that may also explain why there are only few around.
    At the begin I drawn the 5 panels and 6 panels Hulls and the choice finally was for a 6 panels.

    The attached figure will probably explain why.

    In others words, it my understanding is that the 6 panels hull may have some advantages over the 5 panels.

    Above 6 panels the hull is getting close to a round hull and probably some chine hull peculiarities are lost.

    Since sensitive to the hull draft, the 6 panel is offering the lowest value as well a flat panel during low heeling conditions.
    A long flat surface may offer a better lifting like a surf.

    Further, the 6 panels exhibit larger surface orientation angles that could better acts as an anti-drift hull.

    Of course all that it is simply my opinion and the way I look at, nevertheless open to any other points of view.
    Hollow Shadows are drawn and ready for cutting
    Cheers
    Claudio
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    Last edited by claudio; 03-28-2017 at 12:37 PM.

  9. #29
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    Default Re: "1290" Class M Hard Multi Chine Hull

    I forgot to consider the thickness of the lamination (about 0.55mm) and now I have to rectify the shadows one by one !!!
    Only 3 made so far....
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  10. #30
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    Default Re: "1290" Class M Hard Multi Chine Hull

    As per today ! not very satisfied of the hollow shadow cutting and the manual remedy rather boring. Shimming will be necessary in many places. The important matter now is to ensure that the beam width at each station is the one drawn. Because of the chine form, the edges/corners will ensure the hull form stability.
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    Last edited by claudio; 03-29-2017 at 12:58 PM.

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