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Thread: Esterel 45

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  1. #1
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    Default Esterel 45

    Man & Speed game !

    Since some months I was thinking about a New Model to be competitive in terms of speed against the ones sitting in the range of 39 and 50 Inches of length.
    In my opinion, this development may be satisfied since many technologies has changed in the recent years and Rules did not changed very much to stay with the modern times !

    I do recall the progress in the Digital Servos, Batteries, Keel construction techniques, and more recently the 3D Printing.
    How long we shall ignore them ?

    Old models developed in the 1930 and in 1988 are now out of date from technological point of view in spite of their excellent spread at International level.

    My new model is called ESTEREL-45 and long 114.5 cm.

    I have prepared a short PDF file describing the reasons behind this Design approach.

    Comments are welcome !

    ClaudioD
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    Last edited by claudio; 04-28-2017 at 05:41 PM.

  2. #2
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    Default Re: Esterel 45

    I love the idea of just making something that goes fast.
    I shall make one one day!!!

  3. #3
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    Default Re: Esterel 45

    Keeping my fingers crossed while carbon-carbon Fin is under bonding process, I drawn a possible back up using a classic construction method similar to the one I used before.

    This is what I have found ...
    of course the tissue will be crossed 0 -45.
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  4. #4
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    Default Re: Esterel 45

    Removed all excess of lamination. Weight down to 127g .
    I'm pretty sure that this fin will not be rigid enough and addition lamination may be needed after previous sanding.
    Waiting one week for complete polymerization before deciding what to do.

    Actual surface (both faces) + one additional carbon layer will be : 7.8dm x 1.6g/dm x2 epoxy = 25g + 127g actual Fin = 152g or a bit less because of previous sanding.
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  5. #5
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    Default Re: Esterel 45

    the world's most famous kitchen scale!!!

  6. #6
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    Default Re: Esterel 45

    Often the time bring better solutions to an existing design project.
    During my forced "rest time" I reviewed the Esterel 45 project.
    Based upon the fact that, all the rest being equal, the lightest boat should be the faster.
    The technology evolved and what was initially considered 4300g a good displacement, with more careful construction considerations, I found out that this limit can be lowered toward 3800g.
    Of course not all parts are yet constructed, but I can anticipate that the major contributors to a potential weight reduction are the Servos and Fin and to a certain extent also to the Rig and as well the Hull and Deck material choice.
    The recent class M "1290" construction proved that the Multi Chine shape generated a very strong hull.
    There, I did used 3 coats of fiberglass of 80g/m. Today I would use only 2 layers.
    In 2001 my "Studio 2", a class M, was made with Carbon and Kevlar layers and weighted only 147g ! Probably it would not supported a lateral shock !
    Considering that the Esterel 45" make use of only one Chine, but it is a smaller Hull than a M, I could make use of a stronger tissue than glass by using 93g/m Carbon tissue combined with 68g/m Kevlar or Carbon/ Kevlar.
    The truth will be pop up once the model will be made. Noting that the shorter LWL will allow some margin of error before reaching the LOA.
    Here below the actual Budget
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  7. #7
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    Default Re: Esterel 45

    Revisiting the Balsa Fin Design some width dimensional data are changed because of the Carbon Skin thickness that modify the end product dimensions.
    Generally I use to make the Appendage's Areas equivalent to 6/6.5% of Sail Area.
    Taking an average Sail Area of 7300cm, the Appendages areas may vary from 438cm and 474cm. The Fin will use 3/4 of that area = 328cm to 355cm
    Taking into account final dimension, I reduced the balsa width dimensions. See Profiles.
    Since I do have introduced a 4x4mm square tube as well the 4mm brass rod the fin thickness will be constant from top to bottom and by consequence the profile thickness will change from 6.2 at the Top to 7.0% at the Bottom.

    Meanwhile the Trailing Edge on the Full Carbon Fin is bonded and Leading edge under way.
    I think the Final Carbon Fin will be some few grams above the expected weight. Off course the trimming of aluminum trailing edge will partially compensate.
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  8. #8
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    Default Re: Esterel 45

    Here below my last design trial aiming to total weight reduction. From 4300g down to 3800g/3850g and Sail Area of 73dm
    Not an easy model make to reach the design weight unless Carbon Tissue is used.
    Many internal supports are based upon Carbon square tubes available with 4x4, 6x6, 8x8 mm
    Some Options are supposed to increase weights.
    Preferred solution Flat Deck with booms as close as possible to deck
    Under consideration a 3 servos configuration: Main, Jib and Jib Trimmer/Backstay
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    Last edited by claudio; 08-10-2017 at 07:28 AM. Reason: added text

  9. #9
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    Default Re: Esterel 45

    Balsa Fin preparation ...
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  10. #10
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    Default Re: Esterel 45

    Yes, very old !
    After the deception about the flexibility of the second balsa core Fin and 2x160g/m carbon tissue only, a new Fin design started with a plywood core, not only but also decided to increase (power of 4 oblige) the profile thickness up 7.5/8.0%. My friend Pierre persuaded me that 7 or 8 % is no matter versus performances at this Reynolds level as well additional 20/30g in the total budget, therefore I decided to make a new Fin.
    Lot of precision sanding waiting for me !!!

    Of course I will adds 1 additional 160g/m carbon layer to the first Fin. Certainly I will gain in rigidity, but also increase the weight !
    Stay tuned the saga continue...
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