So what went wrong???

Discussion in 'Boat Design' started by ondarvr, May 19, 2014.

  1. ondarvr
    Joined: Dec 2005
    Posts: 2,808
    Likes: 487, Points: 83, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

  2. ondarvr
    Joined: Dec 2005
    Posts: 2,808
    Likes: 487, Points: 83, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

  3. messabout
    Joined: Jan 2006
    Posts: 3,238
    Likes: 384, Points: 83, Legacy Rep: 1279
    Location: Lakeland Fl USA

    messabout Senior Member

    From the looks of it, it seems that it is absurdly top heavy.

    Was that travesty designed by a credentialed NA? I think not. Is the builder complicit in the disaster? Let us hope that the builder had some ironclad disclaimers legally recorded.
     
  4. Grey Ghost
    Joined: Aug 2012
    Posts: 194
    Likes: 9, Points: 0, Legacy Rep: 94
    Location: california

    Grey Ghost Senior Member

  5. Skyak
    Joined: Jul 2012
    Posts: 1,396
    Likes: 111, Points: 63, Legacy Rep: 152
    Location: United States

    Skyak Senior Member

    I agree it looks crazy top-heavy. The density change from below waterline to above would have to be wild. I can't imagine this boat could be safe unless they tried to float it without engines. The waterline is about 5% of total height.
     
  6. upchurchmr
    Joined: Feb 2011
    Posts: 3,275
    Likes: 251, Points: 83, Legacy Rep: 579
    Location: Ft. Worth, Tx, USA

    upchurchmr Senior Member

    I would think that the 82K# of fuel and the engines would have made it stable. Looks like not enough weight down low.

    Of course it looks like those absurd cruise liners with too much tophamper.
     
  7. Ad Hoc
    Joined: Oct 2008
    Posts: 7,324
    Likes: 1,218, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    It also depends on "how" it was launched too.

    But in general launching is not straightforward at all. One must check the GM as the water touches and progressively until the vessel is floating free, using the as launched estimated displacement and LCG and VCG. What you find it that there is a localised "sweet spot" where the GM is very low or sometimes negative in the launched condition, and thus, must be mitigated. If you don't...you're gonna end up with a nice news story like above!
     
  8. Rurudyne
    Joined: Mar 2014
    Posts: 1,170
    Likes: 40, Points: 48, Legacy Rep: 155
    Location: North Texas

    Rurudyne Senior Member

  9. Rurudyne
    Joined: Mar 2014
    Posts: 1,170
    Likes: 40, Points: 48, Legacy Rep: 155
    Location: North Texas

    Rurudyne Senior Member

    I wonder if the owners manual advises against having less than 50% full tanks?
     
  10. powerabout
    Joined: Nov 2007
    Posts: 2,931
    Likes: 66, Points: 48, Legacy Rep: 719
    Location: Melbourne/Singapore/Italy

    powerabout Senior Member

    a yard in thailand also sunk a 55m megayacht by a down the slipway launch which is asking for trouble unless its a fishing trawler
     
  11. Mr Efficiency
    Joined: Oct 2010
    Posts: 10,401
    Likes: 1,035, Points: 113, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    $10 million for a 90 foot boat ? Is it 18-carat or 24-carat ?
     
  12. powerabout
    Joined: Nov 2007
    Posts: 2,931
    Likes: 66, Points: 48, Legacy Rep: 719
    Location: Melbourne/Singapore/Italy

    powerabout Senior Member

    Just for the claim
     
  13. Poida
    Joined: Apr 2006
    Posts: 1,189
    Likes: 51, Points: 48, Legacy Rep: 497
    Location: Australia

    Poida Senior Member

    It was a question I was going to ask of the forum members.

    When you look at boat designs sometimes you see photos of the finished boat and sometimes just the drawing, indicating it is a boat design that no one has built yet.

    The question is, is it safe to build a boat directly from a design.

    I guess this thread answers that question.

    Poida
     
  14. powerabout
    Joined: Nov 2007
    Posts: 2,931
    Likes: 66, Points: 48, Legacy Rep: 719
    Location: Melbourne/Singapore/Italy

    powerabout Senior Member

    my 5 year old can design boats too
     

  15. Rastapop
    Joined: Mar 2014
    Posts: 278
    Likes: 5, Points: 18, Legacy Rep: 46
    Location: Australia

    Rastapop Naval Architect

    How would you launch a 55 m yacht?
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.