The "S" Number

Discussion in 'Multihulls' started by Pat Ross, Feb 13, 2011.

  1. Pat Ross
    Joined: Jul 2006
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    Location: Florida

    Pat Ross Corinthian 41 Tri #12

    In the February/March 2011 issue of Professional Boatbuilder magazine, the ROVINGS section by Dan Spurr, there was a summary of a section of The Design Ratios by Eric w. Sponberg of SPONBERG Yacht Design Inc. dealing with the S Number. The S Number is a formula that assesses relative performance of sailing yachts, giving values that range from 1 to 10
    The Multihull Dynamics, Inc. website has used the term Base SpeedTM to do comparisons of performance potential. It results in a projected Best Days Run speed over a 24 hour period under racing conditions.

    The article roused Cal Markwood’s curiosity, Engineering Analyst for Multihull Dynamics, Inc. He was interested in the applicability of the S# to catamaran sailboats and how it compared with Base SpeedTM as a method of evaluating performance potential.

    The S Number http://www.multihulldynamics.com/news_article.asp?articleID=232

    Pat Ross
     
  2. gonzo
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    gonzo Senior Member

    This is a multiple post
     
  3. Doug Lord
    Joined: May 2009
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    Doug Lord Flight Ready

    S number

    Warranted in this case because it applies to monohull and multihull sailboats. Thanks, Pat!
     

  4. Pat Ross
    Joined: Jul 2006
    Posts: 53
    Likes: 1, Points: 8, Legacy Rep: 11
    Location: Florida

    Pat Ross Corinthian 41 Tri #12

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