Recent Content by Dolfiman

  1. Dolfiman
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    Advanced learning material on hull shape design?

    1. Hull shape optimization for reduced resistance in displacement mode; For a sailboat, the main issue is the heeled hull drag versus the righting...
    Post by: Dolfiman, Apr 26, 2025 at 5:03 AM in forum: Boat Design
  2. Dolfiman
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    Monohull dinghy with amas above waterline just for stability

    Actually, it lacks preliminary outlines of your project to be able to debate consistently about the safety issue re. the capsize risk and the...
    Post by: Dolfiman, Apr 11, 2025 in forum: Sailboats
  3. Dolfiman
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    Monohull dinghy with amas above waterline just for stability

    The EPOH dinghy , with stabilisers above the water, seems close to your idea :What is the ePoh ? EPOH TRANSSONIQUE NEW DRIVER MADE IN FRANCE...
    Post by: Dolfiman, Mar 30, 2025 in forum: Sailboats
  4. Dolfiman
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    Dolfino - 7m classic keelboat for daysailing

    I have not yet designed such centerboard version with small cabin but for example François Vivier did, like these 2: Maraudeur L 4,83 m. B 1,71 m....
    Post by: Dolfiman, Mar 27, 2025 in forum: Sailboats
  5. Dolfiman
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    Dolfino - 7m classic keelboat for daysailing

    I'm reactivating this old post because a Dolfino was built at last, in fact by a shipyard that did a superb job, then completed by the owner...
    Post by: Dolfiman, Mar 26, 2025 in forum: Sailboats
  6. Dolfiman
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    Gene-Hull Sailboat 3.3 and its post applications Gene-Stab and Gene-VPP

    Please find attached an updated version 3.4 of « Gene-Hull Sailboat » and its post application Gene-VPP. The modifications and/or improvements are...
    Post by: Dolfiman, Feb 11, 2025 in forum: Software
  7. Dolfiman
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    Carlson Hull Designer Alternatives?

    You can test my Gene-Hull free applications developed within the frame of Open office, here is the one for sailing dinghy, the others are...
    Post by: Dolfiman, Feb 4, 2025 in forum: Software
  8. Dolfiman
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    Adding Ballast to Daggerboard

    I did the performance comparison with a light or an heavy daggerboard, all others things equal. For this study (here attached), I quickly modeled...
    Post by: Dolfiman, Dec 4, 2024 in forum: Stability
  9. Dolfiman
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    Adding Ballast to Daggerboard

    As regard the ballast : I also agree with all members that it is not necessary for your dinghy size. It is done for only large dinghy when the...
    Post by: Dolfiman, Dec 2, 2024 in forum: Stability
  10. Dolfiman
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    Marathon racing canoe design for cedar strip building?

    Here is my tentative design with respect to the H20 Slingshot 222 x 33/4 public specifications + the Gene-Hull Canoe file used.
    Post by: Dolfiman, Nov 5, 2024 in forum: Boat Design
  11. Dolfiman
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    Marathon racing canoe design for cedar strip building?

    Weight of a C2 cedar strip version can be say ~ 30 kg to compare with ~14 to 21 kg for an exotic fiber version. With a crew of 2, weight of 150...
    Post by: Dolfiman, Nov 5, 2024 in forum: Boat Design
  12. Dolfiman
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    Marathon racing canoe design for cedar strip building?

    Yes, you can … with using for example this application : Gene-Hull Canoe 3.0 - new version for Canoe, Peapod or Pointu projects...
    Post by: Dolfiman, Nov 4, 2024 in forum: Boat Design
  13. Dolfiman
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    DIY sailboat that can be carried on car roof

    Thanks for your kind words about Velocette. Actually, as it is explained in the pdf, it is Russ Whitford (« VeloceRuss » within Boatdesign forum)...
    Post by: Dolfiman, Aug 9, 2024 in forum: Boatbuilding
  14. Dolfiman
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    DIY sailboat that can be carried on car roof

    Is 1m wide really your limit ? Because with say ~ 1,30 m you can have a real sailing dinghy if it is your core programme, not just a canoe with...
    Post by: Dolfiman, Aug 8, 2024 in forum: Boatbuilding
  15. Dolfiman
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    Designing and Building a 1x rowing shell

    This is the key issue. For the intrinsic stability, I proposed to use the GM1° value computed with the canoe weight + the rower one when sit in...
    Post by: Dolfiman, Aug 6, 2024 in forum: Boat Design