front section has semi-elliptic plan and exponential profile...

Discussion in 'Multihulls' started by idkfa, May 12, 2008.

  1. idkfa
    Joined: Sep 2005
    Posts: 329
    Likes: 6, Points: 18, Legacy Rep: 79
    Location: Windward islands, Caribbean

    idkfa Senior Member

    Hi,

    Can anyone help with "front section has semi-elliptic plan and exponential profile, while the rear section has exponential plan and semi-elliptic profile". It’s the shape that complies with the "(Multi)Hull Resistance Calculator - based on the equations and formulae in chapter 3 of "21st Century Multihulls" by Joseph Norwood Jr."

    A drawing would make it clearly perceptible, thanks...

    idkfa
     
    idkfa, May 12, 2008
    #1
  2. tspeer
    Joined: Feb 2002
    Posts: 2,319
    Likes: 303, Points: 83, Legacy Rep: 1673
    Location: Port Gamble, Washington, USA

    tspeer Senior Member

    The quote describes a shape that is backwards from every other boat I've seen. Norwood's boat would have a blunt bow, sharp stern, and a rocker that sloped down gently from the bow, then turned up abruptly at the stern.

    I think I'd rather base my resistance calculations (and design) on Michlet than Norwood's formulae.
     
    tspeer, May 13, 2008
    #2
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