Hull form evolution for high performance superyacht.

Discussion in 'Sailboats' started by Guillermo, Oct 25, 2006.

  1. Guillermo
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    Guillermo Ingeniero Naval

  2. Raggi_Thor
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    Raggi_Thor Nav.arch/Designer/Builder

    Interestiing and well written, I'll read it :)
     
  3. Stephen Ditmore
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    Stephen Ditmore Senior Member

    Very impressive presentation! But I have some questions & caviats. The shape of the immersed deck wing (best viewed in the inclined waterline view) might impart a turning moment to windward.... no? I haven't read through the entire paper yet.... does the author address the issue of heeled turning moment / weather helm?

    I would also caution that the Gary Hoyt manta, with a similar form, was not entirely successful (problematic in waves), and led to Hoyt and designer/partner Richard Roake parting company. Also note the skeptical reception Doug Lord's ballasted trimaran (or monohull with training floats) has received in these forums. This is a road that has been explored before....
     
  4. xarax

    xarax Previous Member

    This is a water ballasted trimaran, isn’t it? When the hull is SO concave, we can no longer describe the boat as a monohull.
     
  5. Raggi_Thor
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    Raggi_Thor Nav.arch/Designer/Builder

    Yes, it would not be allowed in any racing rule, but this is not a "rule beater", but a 30m fast yacht independent of rules :)
     
  6. Guillermo
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    Guillermo Ingeniero Naval

    Well, it seems like if Sailboat Technology site has dissapeared!
    Just in case, I attach here the article.
     

    Attached Files:

  7. brian eiland
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    brian eiland Senior Member

    Shades of Hoyt's Manta

    When I first saw the aft-wing form in the paper, Hoyt's "Manta" was the first thing that came to mind.

    Does anyone have some 'Manta' literature and/or photos they might post on this subject thread or another?? I can't seem to find any readily available.
     
  8. brian eiland
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    brian eiland Senior Member

    Tri Hull Stabilization Configurations

    Interesting some of the similarites with some power vessel projects:rolleyes:
    Dick Newick Tri-Hull Power Vessel
    http://www.yachtforums.com/forums/16142-post55.html

    Trimarans & the Blade Runner
    http://www.yachtforums.com/forums/13353-post20.html

    White Rabbit & Trimaran Yachts
    http://www.yachtforums.com/forums/general-yachting-discussion/3328-white-rabbit-trimaran-yachts.html
     
  9. brian eiland
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    brian eiland Senior Member

    Another Wing Form

    The carbon fibre hull of Maiden Hong Kong is extremely narrow with a maximum waterline beam of 3.46 metres, and extends to 8 metres on account of the wings. Each wing has the capacity to hold 5 tons of moveable water ballast used to provide additional righting moment to the canting keel as well as to alter the fore and aft trim of the boat.

    Juan Kouyoumdjian
    http://www.juanyachtdesign.com/
    http://www.dkyachts.com/p2_115.htm
    http://www.sailingscuttlebutt.com/photos/04/pong0808/


    Another feature of the boat is the rotating and canting mast which can be inclined up to 7 degrees and rotated up to 60 degrees each side.
     
    Last edited: Nov 29, 2006

  10. Guillermo
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    Guillermo Ingeniero Naval

    Thanks, Brian.
    'Shining', from German Frers jr, was a precursor to Juan's 'Maiden Hong Kong'. GF designed the ballasted wings to avoid the using of canting keel, and Juan put both things together, making beam much narrower.
    But those were racing boats. What's interesting about Matteo Polli's design (also inspired in Shining) is to add extra stability when heeled, thanks to the submerging wings, and then bring the idea to performance cruising yachts.
    The objective in this design was getting a fast and comfortable maxi, designed to sail in not very heavy conditions. Do you think the idea could be applicable to smaller boats, something in the 40-50 feet range?
    Cheers
     
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