generating catamaran model from a given offset of single hull

Discussion in 'Multihulls' started by shrijeet mishra, Feb 27, 2020.

  1. shrijeet mishra
    Joined: Feb 2020
    Posts: 2
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    Location: india

    shrijeet mishra New Member

    Hi everyone.
    I am doing project over making a catamaran ambulance vessel
    I need your kind help in regard with modelling the catamaran hull surface with help of the offset of single hull am having which I used to make lines plan and other preliminary checks to have it in maxsurf software or any other software which you suggest for it and the markers you provide will be used in it and there by do its capacity and stability check of trim and GZ and heel and turning radius.

    Hope to get some help ASAP since I got less days to present my preliminary design of trim and stability.

    thank you

    Attached Files:

  2. bajansailor
    Joined: Oct 2007
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    Location: Barbados

    bajansailor Marine Surveyor

    Welcome to the Forum Shrijeet.
    I am not too sure what sort of help you are asking for - and it appears that everybody else is not too sure either, as you have had no replies.
    Are you looking for somebody to input your offsets into MaxSurf to generate a lines plan for you?
    If you cannot do it in MaxSurf, try doing it by hand on paper the traditional way - this should be possible if you have offsets?
  3. trip the light fandango
    Joined: Apr 2018
    Posts: 326
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    Location: Rhyll Phillip Island Victoria Australia

    trip the light fandango Senior Member

    Have a look around for available designs on the web and use one that is suitable, ask here what could be changed a little so that it is more"your" concept, plagiarise[better still contact the designer] and get help here from experts that are free without asking for too much is my suggestion. The ambulance idea is yours, position equipment and berths, put the heaviest things in the middle, there's a start. Only release some of the details to start with...customise when you have more time.
    Last edited: Feb 28, 2020
  4. TANSL
    Joined: Sep 2011
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    Location: Spain

    TANSL Senior Member

    My impression is that the OP needs: "help in regard with modelling the catamaran hull surface". Therefore drawing the body lines plan by hand on paper will not be useful for him.
    What he should do is learn to model in Maxsurf or in any other software to perform the naval architecture calculations. If he copies an existing model (yes, it is a way to start), he will never learn to model and will have to adapt his design to the model he has been able to create and not otherwise create the exact model that his design needs.
    In short, my advice is to forget about easy paths or shortcuts and do his job. Having to always depend on another person to make the models is a very expensive toll.
  5. shrijeet mishra
    Joined: Feb 2020
    Posts: 2
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    Location: india

    shrijeet mishra New Member

    hi sir
    no sir i was trying to get someone to use my offset table to make a catamaran model in maxsurf.
    i tried myself and got something about which i wanted.
    the excel am attaching and also the maxsurf model
    maybe later helps someone for reference.
    thank you.

    on this occasion id also like to get some guidance over the calculation of resistance of high speed catamaran(mine is 30 knots offset based on NPL high speed catmaran model) using molland method and its peculiarities or advantages.
    also more important is the my hull is of GRP structure and ive chosen IRS classification but i didn't get any such formulas or rules to get the demihull weight cross structure weight of superstructure and outfit weight for light ship calculation. can someone guide me in that part for the lightship and other capacity calculation of ship.

    what i have done is considered demihull part of eppillsoid and other structre found its SURFACE AREA n assumed thickness of 1.5 thus giving the mass of GRP hull in structures.

    but its too much approximation. if someone give me some excel or pdf where i can use it for weight calcution. or can be used for IRS GRP HULL midship deisgn.

    i tried uploading excel but am not able to do it.
    ill do it later

    thank u all for your kind advice and time.

    keep helping and guiding.
  6. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    Is this for a contract to build a ship or homework?

  7. TANSL
    Joined: Sep 2011
    Posts: 5,898
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    Location: Spain

    TANSL Senior Member

    @shrijeet mishra, I apologize because apparently I have misinterpreted your intentions and I appreciate the offset table you have shown us, for what it is worth.
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