Displacement problem maxsurf stability

Discussion in 'Stability' started by Endarkwolf, Dec 22, 2016.

  1. Endarkwolf
    Joined: Dec 2016
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    Endarkwolf Junior Member

    Wow it really works!! How did you do that?? My new model (when I said it's resolved) is a brand new model with new size so that's why I think it's worked, but yours? It's the same one! Amazing!!

    I'm going to use yours instead if I may.. Really,, thank you thank you very much!!
     
  2. Rabah
    Joined: Mar 2014
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    Rabah Senior Member

  3. Endarkwolf
    Joined: Dec 2016
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    Endarkwolf Junior Member

    Hello Rabah,

    No, I made the model with only bow and hull shaped particularly. The other shape is conditional, and since I don't know the good shape for them, I just made it like that.

    I'll accept any guidance to make it better..

    And thanks for the post link!! It really helps!

    Thank you..
     
  4. Rabah
    Joined: Mar 2014
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    Rabah Senior Member

    Hi Endarkwolf,
    It is called a triple-hulled vessel /trimaran/ with outlines type „Volatile seagull”. It is used at motorboats with smaller ship dimensions. It has a main displacement body in CL and two additional laterals which call "sponsons". The reference for them is the following rule - keel lines of two sponsons always are above the keel line of the main body in CL.
    Major triple-hulled vessels like ferryboats and aircraft-carriers have three separate displacement bodies joint only with the Main deck.
    If we shall make scaling of this model with coefficient 5 we shall receive the following motor boat dimensioned:
    Loa = 4m; B = 1,2m; H = 0,75m; T = 0,36m
    ________________________
    NA Razmik Baharyan
     

    Attached Files:

    Last edited: Dec 27, 2016
  5. Endarkwolf
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    Endarkwolf Junior Member

    Hello again Rabah..

    Oh you mean making them fully trimaran? I'm afraid I can't, as my assignment is "design one monohull ship as creatively as possible". So if I make it trimaran my professor aren't going to accept it..

    Yours is a very superb design though, I hope I'll be as good as you one day haha..
     
  6. Rabah
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    Rabah Senior Member

    Hi Endarkwolf,
    And what you will say about this variant - see the files?
    _______________________
    NA Razmik Baharyan
     

    Attached Files:

  7. Endarkwolf
    Joined: Dec 2016
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    Location: Depok, Indonesia

    Endarkwolf Junior Member

    Hello rabah,

    Once again,, it's awesome. What the name of this type? Can I use this design as reference? I guess if it's like this my prof can still count it as single hull.
     
  8. Rabah
    Joined: Mar 2014
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    Rabah Senior Member

    Hi Endarkwolf,
    It in effect is a mono-hull. The additional bodies are received only for additional volume at heel because augment the righting moment, that is augment the stability.
    There is no problem to use the model - I was made it for you. You can scale on what size you want.
    And on your old question how I have managed to make so fast this model the answer is very simple - all over again in Rhinoceros v.4 and then I unclose the file in Maxsurf Modeler /see http://www.boatdesign.net/forums/de...odeler-ready-model-other-programs-55792.html/
    ________________________
    NA Razmik Baharyan
     
  9. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    Sorry to interfere in your conversation but my ignorance of the hydrodynamic concepts that you two are managing is huge so I wonder if a hull of the same length, breadth and depth, monocoque, would not have much less friction resistance and much less resistance by wave formation. The interference between the hull waves produced by the "tri-hull" would disappear and, probably, the power necessary to reach the same speed would be smaller.
    What do you think about it?
     
    Last edited: Jan 1, 2017
  10. Endarkwolf
    Joined: Dec 2016
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    Endarkwolf Junior Member

    Hello Rabah,,

    Thank you so much, you really help me a great time.

    Hello TANSL,

    Yes, it would disappear. In fact making it semi trimaran and flat hull will increase the resistance. My professor and seniors still conducting a research about this topic. But since I'm still a junior I don't know that much. I'm sorry.
     

  11. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    A trimaran can be good in certain cases and even necessary. But three hulls so close together can never be good.
     
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