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Thread: Esterel 45

  1. #21
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    Default Re: Esterel 45

    Bonding process continue...
    Only the central beam is bonding, while leading and trailing edges will be bonded later.
    The weight is very close to 130g ! Hope the strength will be also there !
    Part of the aluminum trailing edge will be removed and a hard wood leading edge will be probably added.
    According to my records, the epoxy resin weight used up to now is 17g.

    Actual weight 126g before leading and trailing edges bonding, therefore the total epoxy resin used so far is 20g.
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    Last edited by claudio; 08-22-2017 at 08:02 AM. Reason: added new weight

  2. #22
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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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  3. #23
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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 7300cm², the Appendages areas may vary from 438cm² and 474cm. The Fin will use 3/4 of that area = 328cm² to 355cm²
    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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  4. #24
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    Default Re: Esterel 45

    Balsa Fin preparation ...
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  5. #25
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    Default Re: Esterel 45

    A Bad News that become a Good News !!! While I was cutting the Aluminum stripe excess a strange noise pop up indicating local dis-bonding. Decision taken : Remove the aluminum stripe all together, removing at the same time the risk of cutting my fingers when manipulating around the trailing edge and at the same time reducing the Fin Weight !!!....

    I'm getting old and forgetting some tricks, in the past the "123" Fin was made by using an Aluminum stripe plenty of holes to ensure better bonding !!!
    After discussion with my friend Mechanical Engineer, I decided to let thinks as they are, further a sharp truncated trailing edge of 1mm of thickness appears to be more efficient hydro dynamically.
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    Last edited by claudio; 08-24-2017 at 01:33 PM. Reason: added text

  6. #26
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    Default Re: Esterel 45

    The Aluminum stripe is replaced by epoxy resin as in the picture.
    Actually the Fin appears very stiff, but test with 3.0kg bulb will be made at the end of next week and not before.
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    Last edited by claudio; 08-27-2017 at 03:07 AM.

  7. #27
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    Default Re: Esterel 45

    For the Balsa-Carbon Fin I changed my mind, instead of one carbon square tube I introduced two carbon carbon tubes. Don't ask me why, just a guess for strength. Full Carbon Fin is "resting" waiting for total polymerization (one week).
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    Last edited by claudio; 08-28-2017 at 06:46 AM.

  8. #28
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    Default Re: Esterel 45

    Basic Fin components are bonded except the leading edge.
    Only one face sanded.
    Actual weight 70g, this include the addition of Leading Edge carbon Rod and epoxy resin used for bonding.
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  9. #29
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    Default Re: Esterel 45

    Standby for a while due to annual shops holiday.
    Missing carbon tissue
    Wood plates for clamp
    Soft foam

    Carbon Fin bending test with 3kg bulb will be carried out this week according to that setting :
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  10. #30
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    Default Re: Esterel 45

    As planned, today after 9 days from assembly, I have performed the 'bending test' of the carbon Fin with the 3Kg Bulb.
    The results are not the ones I would have hoped, but still inside for a future use.
    With a 5.5mm thick Fin is probably the max I could achieve.
    5.5mm / 80mm chord = 6.8% thus better than 7% if all that has some meaning for our models.
    Of course under water the 3.0kg Bulb will become 2.72kg and the Fin will bent less..!
    These are all excuses to justify the Fin use !!!!

    No shape hysteresis noted.
    The test will be repeated next WE when the polymerization will be more mature.
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