Making this boat self righting.

Discussion in 'Stability' started by zurk, Apr 22, 2014.

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  1. PAR
    Joined: Nov 2003
    Posts: 19,133
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    This is a silly thread, by an equally silly poster. He seems to think we don't do much and that which we do, is just barely adequate and not very timely. What a bunch of insult laden, obviously ill informed, non-educated BS. This poster is clearly either too young to understand the realities, of the processes involved or is blatantly ignoring or in denial of them.

    Are you nuts? My latest racer went undefeated for it's first season and I wasn't very far out of the box, considering the rules package I had to conform to. Did you see the last America's Cup with sailboats dancing around at 50+ MPH in 20 MPH wind strengths? Yeah, these where just "barely built to standards". You're an indignant fool. Screw you. I make every effort to insure the safety of the crew and exceed the SOR's performance envelop, when possible, given the typical, conflicting restraints.

    "Statement Of Requirements" and the very first thing any professional will ask of the client on any project. It simply defines the goals of the project, so you have targets to shoot for. Anything less is just a joke.

    Another, obviously uninformed but of ridiculousness. It takes years to develop a new car model and they aren't designed for every eventuality, just ask the families of the 40,000+ MVA's fatalities (or the much larger number of injured) that occur in these "every eventually" designs each year. More rhetoric from a no nothing kid?

    Never been in knock down or capsize? I have, and this is just prove of what you don't know. A knock down or capsize is a violent event. It's not the movies where the "Poseidon" slowly rolls over and everyone gets a chance to walk on the walls, then the overhead. It's fast, usually very unexpected and the crew is tossed around the interior of the boat like rag dolls, with enough force to kill them. Then there's the flying debris from every nook and cranny, each capable of crushing a head (mass x speed). If the crew is in the cockpit, they'll be in the water, maybe after being bashed in the head by a piece of under engineered, poorly assembled, inadequate equipment, that broke free of it's insufficient fastenings, of course intended by the incompetent engineers and installers.

    You have a fair weather boat, so asking it to take on force 10+ conditions, means it's all wrong for this task. There are boats that can take on hurrcanes and come out, mostly okay (there's always going to be some damage in these events). These types of boats look like submarines, more so than a fishing boat. They're tight, completely, easily dogged down, very little windage, no exposed cabins, no open cockpits, usually just a self draining foot well and they roll, man do they roll, with a fraction of the initial stability of the boat you've shown. It's CG will be low, really low compared to what you have, plus countless other consideration, most of which haven't anything to do with inflatable bags or fixed floatation.

    So, spare us the lack of any clue you might think you own, about how things are designed or built, you simply don't have any idea. Your 5,000 pound straps will break, the first time they're ask to perform. I just finished up a design for a 26' sailboat, which weighs in at 4,500 pounds. The breaking strength of the lower shroud clevis pin (the weak link) is nearly 12,000 pounds, because I've calculated the forces involved in a knock down, let alone a capsize. By the way, if this boat is capsized, she will roll upright, but the rig will be gone, in spite of the 12,000 weakest link clevis pins. You haven't the slightest idea. It's taken 10 years to get the first conceptual sketches of the 787 to production. It took 4 years for the new Honda Civic to go from a model, to rolling out of a factory and this used existing engineering and platform interchangeability.

    Get a grip, by a book, go to school and show some respect for folks that have spent countless tens of thousands and many years on education , plus the decades of practical and industry experience. Better yet, fill a buddies jon boat half way up with water and try to bail it out. You'll learn a lot.
     
  2. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    The Zurkster does have a tendency to not listen to naysayers, which is OK if you are Einstein, otherwise not so much. In any case, even if zurk manages to achieve his self-righting aims, his boat will likely turn into a dog, what with all the extra hardware added in to it.
     

  3. Boat Design Net Moderator
    Joined: Feb 2010
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    Location: www.boatdesign.net

    Boat Design Net Moderator Moderator

    It's probably best to close this thread at this point before it gets out of control; not sure if the post with the word professionals in quotes was aimed at anyone who replied or if it was unintentionally very offensive without thinking of how it would be received, but it seems this thread has hit the rocks, so in an effort to try and keep the forums more positive and away from threads where people are more upset or offended than inspired to help, this thread is being closed at this point.
     
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