Hull Design

Discussion in 'Boat Design' started by emsnoel, Mar 2, 2010.

  1. TANSL
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    TANSL Senior Member

    bhnautika, I do not know what kind of boat are you designing. I think you're very lucky. I can tell you that dealers of Maxsurf advised me to use Rhinos to make the 3D model of my ships.
    As a teaching example, please, try to make the body plan for a GRP boat you have to build from an existing mold............
     
    Last edited: Apr 25, 2013
  2. bhnautika
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    bhnautika Senior Member

    TANSL If on the rare occasion of having to create a hull model of an existing mold in maxsurf I would use the add on “prefit” to get the surfaces from the offsets. I do all hulls in maxsurf and nearly everything else in Rhino then all working drawings in a 2D drafting package. I find this gives me a good forward workflow without to many file back compatibility issues (trimmed surfaces etc).
     
  3. TANSL
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    TANSL Senior Member

    bhnautika, probably my ignorance is that I have not sufficiently explored the possibilities and tools in Maxsurf. Could you please elaborate on the procedure that you use?. Thank you.
    I have to work many times for yards that have various molds and use them for different boats, which can vary in length, beam or depth but they use the same mold, with slight modifications or additions.
    Another of my jobs, frequent, is to make the inclining test of existing ships which, after the years, and for various reasons, change their forms (adding a bulbous bow, for example) or their lightship weight. This forces me to create the model from an existing body plan, often on paper.
    It will help the procedure used by you.
    Thanks again
     
  4. samana
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    samana New Member

    I'd agree that Maxsurf can be a little difficult to get a hull that *exactly* matches a table of offsets, existing hull, or whatever. It depends on how long you want to spend on the model, the precision required, and the intricacies of the hull shape.

    I've found that some simple hullforms can be reproduced without too much pain, especially if only needing the hull for a stability analysis or similar. However, there have been some others that required numerous surfaces and excessive rows/columns of control points to match a hull that came from a different modeling package.
     
  5. rasel02232129
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    rasel02232129 Junior Member

    bhnautika Thanks for your reply and kind co-operation.
     
  6. bhnautika
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    bhnautika Senior Member

    TANSL here is a link which shows the process. You can use a DXF file for markers to import past or present drawing files or create new markers in maxsurf. www.youtube.com/watch?v=KgHmvT-Zbyk
     
  7. TANSL
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    TANSL Senior Member

    bhnautika, I really appreciate your efforts and I greatly appreciate you the link.
    I know the process of the markers. It hepls to make a surface that resembles the boat but is NOT the boat. If you study carefully where the surface is going, you will see that it goes not by markers, but very close to them. This, in many cases, is not sufficient.
    Do you know how much work there is to do, the hundreds of points to be adjusted when the boat has keel and several knuckles?. And speaking only of monohulls.
    I've been around three years working with Maxsurf and more than 20 projects. From the third project I decided to make AutoCAD models and export them to Maxsurf. The first three models made ​​me kindly Maxsurf representative in Spain. The third, even they were not able to do. They had to send it to Australia. The comment was that "better remove the knuckles" because they greatly complicated the model, I advise me to use Rhinos
    Now, with some software developed by myself, which helps me to make some gorgeous models with AutoCAD, plus the help of Maxsurf to calculate, I get solve all my problems.
    I am convinced the wonders it has Maxsurf but modeling is not his strong point. I know many other professionals use programas to model and exported to Maxsurf. In fact, Maxsurf has a command to import Rhino.3dm files, which is a proof that something is not perfect.
    Cheers and thanks again.
     

  8. bhnautika
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    bhnautika Senior Member

    TANSL it’s obvious you require a specialised set of software to achieve the modelling you require and the accuracy. I think it’s a bit harsh to say that maxsurf is not good at modelling just because of some issues with reverse modelling from molds. I have been using maxsurf from beta testing in the 90’s and on most standard hull shapes have found maxsurf quick and easy. I have on occasion done some hulls in rhino but mainly just superstructure. In the end its up to what gets the job done.
    For fun bird modelled in maxsurf
     

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