Intact Stability

Discussion in 'Boat Design' started by Sea Dog, Feb 20, 2006.

  1. Sea Dog
    Joined: Feb 2006
    Posts: 2
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Nova Scotia

    Sea Dog New Member

    Can anyone offer a short definition of INTACT STABILITY ? I require a short definition for a paper I'm writing. I have looked in many texts and looked at douzens of websites, and every potential source I've checked talks around the term, but never defines it. Can anyone even suggest a good website to check ?
    Thanks if you can help.
     
  2. Pelle
    Joined: Oct 2005
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Göteborg, Sweden

    Pelle Naval Architect

    In my mind the words intact stability refers to the stability properties of an undamaged ship or boat. If some damage such as a leak occurs one speaks of damaged stability.
     
  3. Guillermo
    Joined: Mar 2005
    Posts: 3,644
    Likes: 183, Points: 63, Legacy Rep: 2247
    Location: Pontevedra, Spain

    Guillermo Ingeniero Naval

    Good question. As everybody I know what intact stability is, but I also cannot find a definition in written, after consulting several books, papers and internet sites (!)

    A possible definition could be: "The stability of a body in watertight integrity condition"
     
  4. Thunderhead19
    Joined: Sep 2003
    Posts: 506
    Likes: 3, Points: 0, Legacy Rep: 21
    Location: British Columbia, Canada

    Thunderhead19 Senior Member

    Maybe "The capability of an undamaged vessel to resist a heeling force" or "The righing characteristics of a vessel in the abscence of any downflooding"
     
  5. SamSam
    Joined: Feb 2005
    Posts: 3,437
    Likes: 106, Points: 63, Legacy Rep: 971
    Location: Coastal Georgia

    SamSam Senior Member

    Well, here's a good website but it's not in it either. Sam

    http://taylormadegroup.com/glossary/index.html
     
  6. SamSam
    Joined: Feb 2005
    Posts: 3,437
    Likes: 106, Points: 63, Legacy Rep: 971
    Location: Coastal Georgia

    SamSam Senior Member

    Maybe here somewhere....
    http://www.google.com/search?hl=en&lr=&q=stability&as_q=intact

    I found this...

    "Intact Stability Package - If you are interested only in the undamaged (intact) condition calculations, you can select our Intact Stability Package. It contains all of the same programs, except for the Longitudinal Strength Module. It can define appendages, but no internal compartment shapes and no compartment calculations are allowed."

    at this site...
    http://www.newavesys.com/prod02.htm
    and that is as close to a definition as I can find. Sam
     
  7. Bill C
    Joined: Feb 2006
    Posts: 3
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Maine

    Bill C New Member

    Stability as defined by Introduction to Naval Architecture (Gilmer and Johnson p313 Naval Insititute Press, Annapolis Maryland 1982 in case you need a cite for your paper), is "The tendancy of a ship to remain upright or the ability to return to her upright position when heeled by the action of waves, wind, etc.)

    I'll expand on that a little, as you specifically asked about intact stability. Intact stability evaluates stability in an undamaged condition from a transervse perspective at small angles of heel (initial stability), longitudinal perspective (longitudinal stability), and again transverse at large angles of heel (sometimes called general stability also evaluates free surface effect, swashing, etc).

    Damage stability represents the stability characteristics of a vessel when damaged, generally considered in the form of compartmnental flooding. This is an iterative process (guided by class society and government regs) that helps the designer locate watertight bulkheads. Ultimately this will result in a damage stability booklet that ship masters and salvors can use to keep a vessel upright in a damaged condition.

    I hope this helps you. All of this is answered from a large steel ship perspective, if anyone has a more user friendly small vessel definition I'm all ears.
     

  8. Sea Dog
    Joined: Feb 2006
    Posts: 2
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Nova Scotia

    Sea Dog New Member

    Thanks my fellow sailors for your contributions to my search for a definition of Intact Stability. You's have ended an elusive search of texts and websites.
     
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.