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Thread: Esterel 45

  1. #41
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    Default Re: Esterel 45

    Opened the molding plates 21 hours after lamination. Surface appears rough. This was expected and this is why I added glass fiber layer of 48g/m. Sanding and probably some primer needed.
    Curious to see the final weight after removal of the excess of lamination.
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  2. #42
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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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  3. #43
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    Default Re: Esterel 45

    the world's most famous kitchen scale!!!

  4. #44
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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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  5. #45
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    Default Re: Esterel 45

    Leading edge bonding 3mm carbon rod on Plywood core Fin. Epoxy loaded with -balloons.

    Additional 160g/m carbon layer added to the first Fin, the one with 4 square tubes
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  6. #46
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    Default Re: Esterel 45

    Fin plywood section indicating the sanding 'guides limits' by the wood colors
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  7. #47
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    Default Re: Esterel 45

    x 4 carbon tubes Fin out of clamping tool.
    It was 128g at post 25.
    I do not think will come out at the end with less than 160g thus 30g above my specification and not yet tested for bending.

    PS : Some calculations based upon the actual weight for the not finished FIN, and assuming to shorten the FIN by 3cm, the weight will probably go down below 155g.

    This is confirmed by the theoretical added Carbon/Epoxy layer of 30.4 g from calculations. 128g + 30.4 = 158.4g

    It remain the rigidity verification in one week time
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    Last edited by claudio; 09-17-2017 at 12:36 PM. Reason: added PS:

  8. #48
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    Default Re: Esterel 45

    Contrary to my expectations !!!! the 4 square carbon tubes Fin is weighting 159g as is, with shortening could go down to 150g, but not foreseen for the moment. Anyhow still above the 130g specified.
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  9. #49
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    Default Re: Esterel 45

    Plywood core Fin sanded.
    Expected to be heavier than the Carbon Fin of previous post.
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  10. #50
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    Default Re: Esterel 45

    This morning again 2 hours of manual sanding and fine dust to reduce the Fin to a tapered shape.
    Wood weight 99g.

    Expected final weight :

    Fin surface 428cm (one face)

    4.28dm x 1.6g/dmx 2 layers x 2 epoxy x 2 faces = 54.78g
    54.78g carbon sheet - epoxy + 99g wood = 163g + brass rods

    To note that the previous carbon Fin surface is 370cm (one face)
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    Last edited by claudio; 09-19-2017 at 11:38 AM. Reason: added text

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