Catamaran aluminum yachts announced by Metal Shark

Discussion in 'Boat Design' started by DCockey, Sep 27, 2020.

  1. Squidly-Diddly
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    Squidly-Diddly Senior Member

    wave piercing bows with several levels of big horizontal strakes is kinda like my Saw Bow concept, except I figured you want the top level to be spray defecting. Maybe they figured spray defection would be nice for those on foredeck when hitting smaller waves, but for bigger waves no one is going to be sunbathing and you want real wave piercing.
     
  2. Ad Hoc
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    Ad Hoc Naval Architect

    WPB's have been done to death, like noted HERE, yet for whatever reason most seem to ignore the science, and prefer to go with their "feelings" on the subject..... :oops:

    Spray rails, on these type of hulls are merely owing to the shape of the hull not sheading the water that is attached to the hull.
    In some cases, it is a sign of poor design or a designed in feature to be a more production friendly hull...like on the damem axebows....they use a round tube at the stem, rather than a sharp fine joint... which creates the stagnant pressure at the bow.
     
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  3. Squidly-Diddly
    Joined: Sep 2007
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    Squidly-Diddly Senior Member

    the bar graph at "HERE" only mentions bulbous bows, but lots of different superstructures. Are you saying no diff between boat motion regardless of bow type? various videos of wave piercing bows in action in big waves SEEM to show them working as advertised, but few if any show conventional bow along side for comparison.
     

  4. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    In the link of HERE and that post also has many other links for ref too.

    With all the R&D we have done, and many others, correct. There is no hydrodynamic silver bullet that many "feel" or "see" or "think", it is not supported by actual hydrodynamics.
    It is only measurable in terms of decimal places of sensitivity analysis, i.e none.
    But like most things, each has their own 'sweet spot'... but the gains are still very minor and very limited across the spectrum of operations. Ergo = no winner.
     
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