Mooring Force & Winch Capacity calculation

Discussion in 'Boat Design' started by ociship, Dec 2, 2009.

  1. ociship
    Joined: Dec 2009
    Posts: 11
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    Location: vietnam

    ociship Junior Member

    When calculation for 56K B/C
    I have some inform. as below:
    - L.B.P = 182.50M
    - BREADTH = 32.26M
    - DEPTH = 18.30M
    - DRAFT AT BALLAST DRAFT = 5.77M

    I DON'T KNOW HOW CAN I CALCULATE SOME SHIP'S CONDITION Below:

    - WIND PROFILE AREA AT BALLAST DRAFT = ?
    - WETTED SURFACE AREA AT BALLAST DRAFT = ?
    - WETTED PROFILE PROJECTED AREA = ?
    - WIND SPEED DURING MOVING = ?
    - WIND SPEED DURING MOORING = ?


    Please help me to calculate it and supply some FORMULA and some document to calculate.

    Thank you very much.
     
  2. Velsia
    Joined: Oct 2008
    Posts: 92
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    Location: Jersey C.I

    Velsia Floater

    You cannot calculate accurately

    wind profile @ ballast draft
    wetted surface area @ ballast draft
    Wetted profile projected area

    Without having the plans for the ship.

    This will help you with the wind speeds http://www.sailingusa.info/true_wind_calculator.htm but I don't understand your definition of "mooring"

    Out of curiosity could you permit me to be nosey and ask for what reason you are asking this question?
     
  3. ociship
    Joined: Dec 2009
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    Location: vietnam

    ociship Junior Member

    Mean "mooring" all ship is included "bollard, anchor, roller, winch...etc." to be used keeping ship or boat at harbour.
    Thanks your help, if more, please give me.
     
  4. marshmat
    Joined: Apr 2005
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    Location: Ontario

    marshmat Senior Member

    Your wind profile area and wetted profile projected area can be extracted from the drawings of the ship: just look at the profile view, take the total area above water, and then the total area below water. The wetted surface should be known from the main particulars table. These aren't particularly precise formulae, that you'd be using, more likely they're empirical approximations. Close enough plus a safety factor is the best you can likely hope for.
     

  5. ociship
    Joined: Dec 2009
    Posts: 11
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    Location: vietnam

    ociship Junior Member

    Thank you for your help, and then finally you kindly tell me "take the total area above water and total below water" is mean plus including "Port side, Starboard side, forward and after area" or only Port side or starboard side?
     
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