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RE: [bolger] Bolger, Sharpie Catamaran Concept 24ft6in x 14 ft

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  • Jay K. Jeffries
    Cats depend on long, narrow hulls with minimal displacement (minimum immersed surface area) for their performance. If you don t follow these maxims a real dog
    Message 1 of 8 , Feb 16, 2011
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      Cats depend on long, narrow hulls with minimal displacement (minimum immersed surface area) for their performance.  If you don’t follow these maxims a real dog results.  Currently working on my cat design for the Westlawn program.

      R/Jay

       

      From: bolger@yahoogroups.com [mailto:bolger@yahoogroups.com] On Behalf Of Kent
      Sent: Wednesday, February 16, 2011 4:06 PM
      To: bolger@yahoogroups.com
      Subject: Re: [bolger] Bolger, Sharpie Catamaran Concept 24ft6in x 14 ft

       

       

      Bruce, thanks for posting this. I couldn't find anything else about
      this design on the Web. Where can I learn more?

      I think this is a fascinating concept. Its looks could be improved a
      lot by designing some curves and non-90-degree angles into the
      deckhouse. But I see some possible problems:

      - I'm not sure if a sharpie hull is the best for a catamaran. Some
      of the sharpie's advantages only apply when it heels, and cats don't
      do much of that. The shape doesn't look easier to build than a
      V-shaped Wharram type. I'm not expert enough to know how the
      performance compares.

      - A single keel and rudder in the middle is simpler than having one
      in each hull ... or is it? Which is easier to build, really? I
      don't see any clear advantage for the central appendage. Also, it
      increases the draft quite a bit, unless perhaps it's meant to rotate
      sideways and up? But if it did that, the rudder would go with it, so
      you lose your steering.

      Any thoughts?


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