Best Free or Low Cost Marine Design Software? (2006)

Discussion in 'Software' started by Admin, Jan 1, 2006.


Which free or low cost hull modeling program(s) do you use?

Poll closed Jan 1, 2007.
  1. Bearboat

    0 vote(s)
  2. BioDesign

    1 vote(s)
  3. Carene

    2 vote(s)
  4. Carlson Design Hull Designer

    7 vote(s)
  5. Free!ship

    63 vote(s)
  6. HullCAO

    0 vote(s)
  7. Hull Form Free Version

    7 vote(s)
  8. PolyCAD

    3 vote(s)
  9. SDN

    0 vote(s)
Multiple votes are allowed.
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  1. Chris Ostlind

    Chris Ostlind Previous Member


    Hi Steve,

    No specific ideas, as I've never had actual holes in the IGES file, if that's what you mean.

    Can you post the IGES file in question or send it to me at:
    Chris at wedgesail dot com

    I'll drop it in my computer and give you the best guess scenario based on my black hole of vast knowledge on Rhino stuff ;-)

    I have seen sections of IGES files out near the ends of rather slender panels, and those that have a good deal of allowable twist, where the otherwise single IGES surface breaks into a grouping of 3 to 5 extra, tiny surfaces to describe the ends of the larger surface. The Curve From Edges command does not fully integrate those tiny surfaces, so you have to go way into zoom mode to get them to conform.

    The attachment shows a collection of the tiny dudes in cyan.

    Hey, the tunnel flats skiff design that you posted at FreeShip was a very nice effort. I see real potential in that form once a couple of details are worked through in a scale model, perhaps. Nice work, Steve.

    Your work is really taking you to new places.


    Attached Files:

  2. lewisboats
    Joined: Oct 2002
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    Location: Iowa

    lewisboats Obsessed Member

    On the way.

    Thank you was actually in response to a thread here. It would need some testing to get the tunnel to flow right and the back sponsons to support the motor so the A** end isn't dragging too much. With the prop in the tunnel and enought draft to keep it wet, I was thinking that a mesh guard along the bottom of the tunnel would allow water through but help protect the prop from nasties. You could get it high and dry that way and still keep it intact.

  3. Rick Loheed
    Joined: Mar 2006
    Posts: 57
    Likes: 2, Points: 0, Legacy Rep: 16
    Location: Maryland, USA

    Rick Loheed Junior Member

    Export from Rhino

    Say, I downloaded FreeShip too, and like it a lot. Kudos to Martijn!

    I write software in Delphi as well, but alas only have Delphi 5 and it appears it is written in Delphi 7...very interesting and well written stuff. It would only take me a few years to get up to speed.....

    Being a Scow sailor I wish it could do heeled hydrostatics and resistance, but that seems to be on the list too.

    I did read the help file, and wrote this VBscript for export from Rhino to FreeShip. Try it out, I had some success and some unhappiness.

    Read the FreeShip PDF manual, page 17 (Also very nice- the best I've seen EVER for free software....) for what FreeShip expects from you in Rhino- my script will write the file no problem.

    Adjust the closed curve seams to the same end!

    Attached Files:

  4. ballywho
    Joined: Apr 2006
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: New York, USA

    ballywho New Member

    I am looking to make some of my line drawings that I've made when I'm bored into actual 3D designs. They're all high performance sailboats. I assume everyone here will agree that free!ship is my best bet? I want it to be fairly easy to use and learn, it's really just something for me to play around with.
  5. Gilbert
    Joined: Aug 2004
    Posts: 525
    Likes: 5, Points: 28, Legacy Rep: 28
    Location: Cathlamet, WA

    Gilbert Senior Member

    Yes, freeship is fun.
    And it's capability per dollar ratio has to be the best of any marine design software.
    Coordinates of your design's sections can be imported in a txt file to create markers. And then freeship makes a mesh that approximates your design. If you've been playing with it a few days you probably already know this.
  6. pashbe1
    Joined: Jun 2006
    Posts: 56
    Likes: 2, Points: 0, Legacy Rep: 41
    Location: usa

    pashbe1 Junior Member

    holes in Rhino?

    Real Holes or simply Rhinos not so great graphics capabilities? If the holes are simply graphics try joining the two surfaces and then unjoin them again. This accomplishes the visual part. If there are genuine gaps between surfaces I can't help.
  7. westlawn5554X
    Joined: Aug 2006
    Posts: 1,332
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    Location: home lazy n crazy

    westlawn5554X STUDENT

  8. snakefeet
    Joined: Sep 2002
    Posts: 24
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Savannah, GA, USA

    snakefeet Junior Member

    lewisboats, are they actually holes in or between the surfaces? Or does it look like there are jagged gaps between surfaces when you shade the model? If it is the latter, go to Tools -> Options -> Mesh and dial up the mesh quality.

    There is some good info on mesh settings in the help under "Document Properties Mesh Settings"
  9. Raggi_Thor
    Joined: Jan 2004
    Posts: 2,457
    Likes: 64, Points: 0, Legacy Rep: 711
    Location: Trondheim, NORWAY

    Raggi_Thor Nav.arch/Designer/Builder

    In Rhino, try Joining the surfaces to apolysurface, the ShowEdges, "naked egdes" and the JoinEdge.

    Or, MatchSrf (without Join).

  10. Jeff
    Joined: Jun 2001
    Posts: 1,368
    Likes: 71, Points: 58, Legacy Rep: 923
    Location: Great Lakes

    Jeff Moderator

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