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CDR_Ret

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Everything posted by CDR_Ret

  1. CDR_Ret
    Not to disagree with Bruce, but you can import separate images into all three standard views (see the attached image of Galilee when I was working on her stern). Not that it's easy to do so, and if you don't hold your mouth right, you can end up with all three images in one view! As Bruce said, you can import the model as a table of offsets. The manual describes how to do that, but it leaves out several gotchas and the terms they use for the different rows and columns in the text file are ambiguous. I would recommend starting your model this way if you have a CAD program that can display x and y coordinates for station and waterline intersections. If you try importing these into the program, it's going to look pretty messy until you create and designate the crease lines (edges where the curve of the surface is discontinuous). Considering you are doing an ironclad, I assume there will be a lot of those.
  2. CDR_Ret
    Larry, I can help get you started. I'm still tweaking the final hull form of Galilee, but it's the getting started that is tough with this program. I would recommend downloading the free version of the DELFTShip program and manual from here. Be sure your system meets the OpenGL requirements. Read through the interface and hull modeling sections, and then I can walk you through setting up a file, inserting the plan images, and then building up the hull. It's not intuitive by any means, but once everything is in place, the actually modeling is pretty straight forward, and produces a cool result. PM me if you want to do this via email. Terry
  3. CDR_Ret
    Chris, yes, the program is actually quite useful in that respect. You just set up the station spacing on the baseline to match the room and space (14 inches and 14 inches) of the original hull, and the forward and after moulded frame edges appear on the plans. The program projects the stations onto the modeled hull surface. They aren't fixed reference points that determine the hull shape or anything like that. I have a fairly accurate idea of the framing from direct measurements on the bow at the Benicia museum and the stern at Fort Mason in SF. Interestingly, Matt Turner didn't use cant frames, so the spacing problem is even easier to deal with. Druxey, by "fidelity" I meant "true to form", not necessarily structural accuracy. I'm not sure how many bulkheads you would need to avoid the inevitable flat spots between them if they are too far apart. I've carved a half-hull of Herreshoff's Gloriana using the lift method from WoodenBoat plans, so I'm comfortable with that. I could carve the moulded shape of the hull then plank on top of that. The result would be a pretty heavy model, though. Terry Greenville, South Carolina, USA
  4. CDR_Ret
    I am approaching the point that I will need to make a decision as to what technique I will use to build the hull: plank on frame, plank on bulkhead, or the lift method. My model is a fairly straight forward late 19th century brigantine merchant. Never having built a hull from scratch, I am willing to attempt any of these methods, but my greatest concern is ensuring the fidelity of the finished product. Anyone here have recommendations (preferably with explanations)? Thanks
  5. CDR_Ret
    Good morning lehmann. Nice work with that CAD model! I've been using DELFTship Free for developing a set of plans for my brigantine Galilee project, which is featured elsewhere on this site. I must be dense, but the program was anything but intuitive to start a project in. The manual is only marginally helpful. After a steep learning curve, I'm approaching the point where I believe I have a reasonable hull. My reason for using the program arises from the need to correct the stern/transom shape of the vessel in the Smithsonian plans, which are the only existing complete set of drawings for the ship. I have a number of contemporary photos of the vessel that show a distinctively different shape. Chasing these kinds of adjustments around three 2D views is a frustrating task, while the consequences of making adjustments are immediately visible in a 3D CAD program. I'd like to see more modeler interest using this program. It has a lot of potential for identifying errors in plans before committing time and wood to the build. Terry

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