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Thread: Esterel 45

  1. #51
    Join Date
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    Default Re: Esterel 45

    Finally I got the new 4mm brass rod material.
    Pieces ready to be bonded.
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  2. #52
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    Default Re: Esterel 45

    Brass rods bonded.
    Actual plywood core 118g, that's suggest a final weight of 173g.
    Hope will be stiff enough !

    With that, the full construction should stays around 990g therefore just inside the total Budget.
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  3. #53
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    Default Re: Esterel 45

    I have made a mistake, the expected weight of plywood core Fin is much more than expected and with the additional 2x2 layers of 160g/mē the final weight will be close to 200g, thus no need to continue in that direction. A lot of sanding for nothing !!!

    I will keep the Fin I have and going to concentrate on the Hull and Rig.

  4. #54
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    Default Re: Esterel 45

    I seem to have LOTS of those moments lately.
    May the Force be with you!!

  5. #55
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    Default Re: Esterel 45

    Andrew, just forgot that the carbon layers were supposed to be 4 (2+2) and not only 2.
    It may be possible to come back with a full balsa core of 6mm thick to get a profile of 8% instead of 6.5/7.0%.
    Actually a friend told me that I could ask a manufacturer to make it for me, they use special manufacturing processes.

  6. #56
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    Default Re: Esterel 45

    Being silent for a while, main reason my back pains.
    This gave me the time to think about !
    The Fin affair was discussed with a Master in the Fin-Rudder domain like Dave Creed and for him the failure to met the flexural rigidity is due to the 'non use' of UD carbon tissue.
    Ordered therefore UD carbon tissue of various weights : 300g/mē, 250g/mē and 200g/mē. The core will balsa. All in stock now.
    Need to recover a bit before starting manual work.

    I have also reviewed the Esterel 45 design to see if something could be changed before starting 'cutting metals'.
    The major parameter considered is the Hull Wet Area against Draft.
    Came to the conclusion that the actual design could be improved.
    See below images of Main shadow:
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  7. #57
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    Default Re: Esterel 45

    Updated Esterel 45 with model 1b. A bit narrower than previous design ending up with a DSPL of 3852g against previous 3801g.
    Thus narrower but with 51g extra volume.
    Since nothing is for nothing, the draft is passed from 47mm to 50mm.
    Note:
    Shadow 6 immersed perimeter is 1.8% shorter than previous design indicating smaller wet area although not measured yet.
    Attached Thumbnails Attached Thumbnails Click image for larger version

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    Last edited by claudio; 10-17-2017 at 06:53 AM. Reason: added note

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