What is the type of ship whose variation of trim will great during listing(heeling)?

Discussion in 'Boat Design' started by xichyu, Apr 25, 2016.

  1. xichyu
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    xichyu Junior Member

    What is the type of ship whose variation of trim will great during listing(heeling)?
     
  2. gonzo
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    gonzo Senior Member

    Do you mean what kind of shape will make the trim change as the list increases?
     
  3. xichyu
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    xichyu Junior Member

    Thanks!
    My English is poor
     
  4. gonzo
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    gonzo Senior Member

    Only a shape that is symmetrical will not change the trim as the list increases. If there is a difference in shape between the aft and fore ends, the submerged volume will be different as the list changes (measured from the original center)
     
  5. philSweet
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    philSweet Senior Member

    Look up metacentric shelf method. It is a design method, or a design evaluation method, which quantifies the trimming moment due to heel.
     
  6. TANSL
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    TANSL Senior Member

    You should specify which metacenter you're talking about. But in any case the trimming moment does not depend on the metacenter situation.
    Sorry if my English is not very correct. I prefer to have clear concepts though I can not express myself very well.
     
  7. xichyu
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    xichyu Junior Member

    Thanks
     
  8. xichyu
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    xichyu Junior Member

    How many kinds of that ship?
     
  9. xichyu
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    xichyu Junior Member

    I want to know the types of that ship
     
  10. TANSL
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    TANSL Senior Member

    xichyu, I'm not talking about any specific type of ship. That's valid for any floating object.
     
  11. Heimfried
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    Heimfried Senior Member

    But to deal with "heel" and "trim" there must be a certain similarity to a ship hull (co-ordinate directions, espacially a logitudinal direction must be given, which a floating lump hasn't). Otherwise you can't decide, what is "upright", what ist "transverse" and so on.
     
  12. TANSL
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    TANSL Senior Member

    You are quite right. What a thought so deep!. Technically it is impeccable.
     
  13. gonzo
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    gonzo Senior Member

    Designating xyz axes is required to be able to solve the problem. For a vessel, those are agreed as length, beam and depth.
     
  14. TANSL
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    TANSL Senior Member

    What is for you the coordinates origin ?. That is also important. To you, we all know how much you like precision, that should be as important as what the axes are.
     

  15. gonzo
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    gonzo Senior Member

    If we use angles it doesn't matter. For distances, they are relative, so it it possible to use the point designated by the designer as (0,0,0)
     
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