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Correcting list by loading cargo off the centre line.

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  • Correcting list by loading cargo off the centre line.

    Hi guys Im currrently doing OOW SQA stability paper for march 2005 and have gotten stuck on a question.

    It wants to know how much cargo ishoould load at a given distance off the centreline, im struggling because all the ggh formulas need final displacement which is impossible if you arent told what wait to add. any help would be much appreciated.

    cheers,

    Aengus

  • #2
    Transpose the formula so that Final Disaplacement = rest of formula
    “Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do. So throw off the bowlines, sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.”

    – Mark Twain
    myBlog | @alistairuk | flickr | youtube Views and opinions expressed are those of myself and not representative of any employer or other associated party.

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    • #3
      Tanθ = (weight of cargo x Distance from Centreline)/Final Displacement + weight of cargo

      How can i get the final displacement if im not given the weight of cargo to load?
      for refrence here is the question:

      A box shaped vessel is presently at a mean draught of 6.24m and is listed 4 degrees to port.

      KG 8.2; KM 9.0(Constant); TPC 32; Disp. 10400

      Calculate the quantity of cargo to be loaded in the tween deck 13.5m off the centre line in order to be finished upright.

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      • #4
        so if initial listing moment = initial disp. x GGH : 10400 x 0.05594
        = 581.8 TxM to prot

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        • #5
          54 t ?

          Tanθ = (weight of cargo x Distance from Centreline)/Final Displacement + weight of cargo
          .:. Tan4 = (y x 13.5) / ((10400 + y) / y )
          .:. Tan4 = 13.5y / 10400
          .:. 10400 x Tan4 = 13.5y
          .:. y = (10400 x Tan4) / 13.5
          .:. y = 53.86

          Disclaimer: May or may not be right, im in the middle of packing and not paying much attention.
          “Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do. So throw off the bowlines, sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.”

          – Mark Twain
          myBlog | @alistairuk | flickr | youtube Views and opinions expressed are those of myself and not representative of any employer or other associated party.

          Comment

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