SF3300 concave hull question

Discussion in 'Boat Design' started by pironiero, Apr 13, 2021.

  1. pironiero
    Joined: Apr 2020
    Posts: 174
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    Location: saint-petersburg, Russia

    pironiero Senior Member

    I don't know how to put this, but is there any proof that concave shape of the hull at transom of the boat is working as advertised?
    I got this question after looking at more recent class 40 hull lines; it seems that no-one is using concave in class 40 or imoca, or am i wrong?
     
  2. JSL
    Joined: Nov 2012
    Posts: 811
    Likes: 61, Points: 28, Legacy Rep: 41
    Location: Delta BC

    JSL Senior Member

    Can you post this advertisement of the 'class 40' so we can see what the claim is
     
  3. Dolfiman
    Joined: Aug 2017
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    Location: France

    Dolfiman Senior Member

  4. pironiero
    Joined: Apr 2020
    Posts: 174
    Likes: 10, Points: 18
    Location: saint-petersburg, Russia

    pironiero Senior Member

    i dont get it
     
  5. pironiero
    Joined: Apr 2020
    Posts: 174
    Likes: 10, Points: 18
    Location: saint-petersburg, Russia

    pironiero Senior Member


  6. David L. Dodd II
    Joined: Jun 2020
    Posts: 35
    Likes: 31, Points: 18
    Location: New York

    David L. Dodd II Junior Member

    It always amazes me how the old becomes new again and is called innovative, or a first. This abomination now called a double concave keel line has always worked as a way to cheat racing rules based on length and sail area. It crops up in increasingly freakish boats until the rule makers make changes to rule out such horrid designs. Here is an example from over a century ago, from the drawing table of no less than Starling Burgess. If you think this boat is ugly and disfunctional you would be half right. Due to a high sail area to waterline length ration this boat screams along. It is still garbage though.

    [​IMG]
     
    pironiero likes this.
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