Dumb Pontoon Barge Stability

Discussion in 'Boat Design' started by Tevita Lauvili, Dec 8, 2014.

  1. Tevita Lauvili
    Joined: Nov 2014
    Posts: 8
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Fiji

    Tevita Lauvili Junior Member

    Need Help with the Stability calculations

    Is a dumb pontoon barge of length 6m x beam 2m x height 1.6m with a draft of 0.2m and weighs approximately 2.4 tonnes stable having a metacentre of 16.67m...????
     
  2. Ad Hoc
    Joined: Oct 2008
    Posts: 7,887
    Likes: 1,777, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    I think you have your numbers wrong by a simple decimal place, i.e power of 10.

    The BM = 1.66m.
    Since a box the KB = 0.1m
    Therefore your KM = 1.76m.
    So where is your KG?
     
  3. WindRaf
    Joined: Oct 2014
    Posts: 343
    Likes: 5, Points: 0
    Location: Italy

    WindRaf Senior Member

    Transverse metacentric height : 1.767 [m]
    Longitudinal metacentric height : 15.099 [m]

    is stable, if you put weights inside, if you put weights only top flips
     
  4. TANSL
    Joined: Sep 2011
    Posts: 7,583
    Likes: 775, Points: 123, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    To give a more accurate figure should be taken into account if we are talking about fresh water or seawater.
     
  5. Tevita Lauvili
    Joined: Nov 2014
    Posts: 8
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Fiji

    Tevita Lauvili Junior Member


    What are you trying to say WINDRAF...??
     
  6. TANSL
    Joined: Sep 2011
    Posts: 7,583
    Likes: 775, Points: 123, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    The center of gravity of the weights placed on deck could be above the transverse metacenter.
     
  7. WindRaf
    Joined: Oct 2014
    Posts: 343
    Likes: 5, Points: 0
    Location: Italy

    WindRaf Senior Member

    exactly
     

  8. WindRaf
    Joined: Oct 2014
    Posts: 343
    Likes: 5, Points: 0
    Location: Italy

    WindRaf Senior Member

    means that with the weight only on the top, when the barycentres coincide (and in your project are very close) , the pontoon capsize.
     
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.