ship shell expansion

Discussion in 'Boat Design' started by nfadhliellah, Sep 23, 2014.

  1. nfadhliellah
    Joined: Sep 2014
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    Location: perak, malaysia

    nfadhliellah New Member

    hi there,
    this is my first post.
    i want to know about shell expansion.
    what method that u all use to expand the plate to get the actual value of length of plate?
    and what software that be using to this method?
    i've found that rhino and defcar software but i don't know how to get it.
    this is my final year project on my study at university.
  2. Ad Hoc
    Joined: Oct 2008
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    Location: Japan

    Ad Hoc Naval Architect

    Welcome to the forum Nfad...h

    Since you're a student, I would suggest you get a lines plan..any, and then assume sheets of plate of 4 x 2m. Then by simple girths establish where you can place the plating to meet the 4x2m sheets. All by hand. NOT by computer. It takes a bit of time..but once you have done several you get the gist and quickly become very proficient. Much more so than anyone just pressing buttons or finding the "develop" command in a bit of software. It also shows initiative...much lacking these days with students of NA!!
  3. nfadhliellah
    Joined: Sep 2014
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    Location: perak, malaysia

    nfadhliellah New Member

    hi ad hoc.
    thanks for the replying.
    now i'm doing the reverse engineering.
    i've built aluminium boat before and it comes like pre cast from New Zealand.
    the plate is already cnc with some measurement.
    when i assemble it become actual size from the drawing.
    now i already have the drawing and cutting drawing.
    this drawing both i get already made it.
    so i want to know what method that they use to expand the shell to know a actual length.
    is there have manual calculation to get the actual length from curve?
    i actually just to do nesting drawing for 5.6m fishing boat only for my final year project.
    i just intern with New Zealand company but in Malaysia.
    they did all of that from New Zealand.
  4. rwatson
    Joined: Aug 2007
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    Location: Tasmania,Australia

    rwatson Senior Member

    They use a CAD program, like Rhino.

    yes - and as Ad Hoc mentioned, you can work it out from the lines plan

    " reverse engineering."

    So you are trying to calculate the lines plan from the kit - why ?

    Why don't you just get the lines plan - or are you not licensed to have that information ?
  5. nfadhliellah
    Joined: Sep 2014
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    Location: perak, malaysia

    nfadhliellah New Member

    I do the reverse engineering that means i already have a boat.
    So the drawing i have drawn then shell expansion i don't do it yet.
    I also had review rhino.
    How about shipconstructor 2014?

  6. TANSL
    Joined: Sep 2011
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    Location: Spain

    TANSL Senior Member

    As has already been mentioned, the development of the plates nowadays is obtained automatically by some specialized CAD programs.
    As AdHoc says, it would be very useful for you you to made that from a body lines plan, but that plane can be digitized and in 3D, and use the precision you get with "buttons" to make a much more accurate job than handmade.
    Reverse engineering is another problem because, in general, is very difficult for an application accurately reflects the surfaces that pass through your transversal sections. Most applications have a large tendency to pass very near but not by the sections. If the hull has knuckles, work can be stressful.
    If you want you can analyze my application "Formas" because, perhaps, do better than others what you need. It can be downloaded from my website:!software
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