Daggerboard position: Maneuverability VS. Acceleration

Discussion in 'Hydrodynamics and Aerodynamics' started by hashtag_laeuft, Mar 22, 2024.

  1. CarlosK2
    Joined: Jun 2023
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    Location: Vigo, Spain

    CarlosK2 Senior Member

    What Eric Hiscock did with Wanderer I ...

    put a bowsprit on the bow

    We move the Mast forward and, loading the lateral force of the wind on the leeward wave, we hide Mr. Munk under the rug.

    Later sailing with big Waves ... the bow sinks, Mr. Munk goes crazy, gets very angry, and capsizes the sailboat.
     
  2. CarlosK2
    Joined: Jun 2023
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    Location: Vigo, Spain

    CarlosK2 Senior Member

    In most cases the yacht does not capsize, because the waves are not huge, but the autopilot burns out or the sailor has a bad time instead of enjoying the waves and the functional beauty of a well-designed device.
     
  3. CarlosK2
    Joined: Jun 2023
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    Location: Vigo, Spain

    CarlosK2 Senior Member

    Screenshot_2024-07-25-18-11-25-53.jpg

    With an extremely powerful sailboat that carries about 40 (!) square meters per Ton in its basic configuration (StaySail + MainSail) ...

    with so much force there is speed for the hull to create Lift based on High pressure and fly with the bow out of the water

    Yes, but not all sailors go to high competitions, the majority of mortals sail with 10 square meters per Ton.
     
  4. CarlosK2
    Joined: Jun 2023
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    Location: Vigo, Spain

    CarlosK2 Senior Member

    IMG_20240725_184146.jpg

    (Center of Flotation)

    A very simple solution would be to move the centre of flotation forward with a wider, spoon-shaped bow and a slender stern

    Good downwind behaviour is a sum of

    good longitudinal hydrostatic balance

    stable balance of lateral pressures, that is: the sum of the lateral forces of the hull, centreboard/keel and rudder must be aft of the yacht's centre of gravity

    good attitude of the hull, either with high vertical pressure at the bow, or with low pressure, suction, at the stern or with a sum of high and low pressures
     
  5. NirvanaManana
    Joined: Jun 2024
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    Location: Ireland

    NirvanaManana Junior Member

    Many thanks for the concise reply.
     

  6. CT249
    Joined: May 2003
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    Location: Sydney Australia

    CT249 Senior Member

    Twenty knots? On that boat? Where is this data?

    Where, also, is the evidence "the wind force by its leverage arm" resulted in the sinking of the Valkyrie, and since Satanita was nothing like the modern boats you dislike where is the evidence that it is relevant?

    Why do you say the "problem" occurred in 1880-90?
     
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