#11
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Plank Spiling
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On that note the image below shows bowsprit, keel and hull planks. After many tries I am still finding fault with published material. I've got the fantail and midship hull faired but the bow is still giving me fits. New England working boats had a tendency for "apple" style bows which are rather blunt. They differ from the sharper "cutter" bow lines but do not "dig" into the waves in rough weather and chop. Even with CAD it's still a tough swag though I think I'm getting close - maybe this time? +Gil |
#12
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Strange But True Story...,
After wrangling with the bow section it occurred to me that a different approach might not be a bad idea.
I reexamined the bow curve making changes to its profile and the affected bow keel. The technique simply utilizes Rhino's UV mesh for naturally and perfectly arranged strake lines. Simply put, it makes designing planked hulls an unbelievably simple task. I can now laugh at joggles and stealers..., Note that the last two strakes look somewhat out of place. Slocum added them in his rebuild for an increased freeboard - a good thing. The following renders show in-progress work. +Gil |
#13
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Wow, Gil, that is just extraordinary work. Your rendering provides a wonderful view of the run of the planking, and lets us all see her nice lines even with the added freeboard strakes. I love the background you've added, quite an attractive picture all around!
This is going to be a beautiful little craft! Looking forward to seeing more! Cheers! Jim |
#14
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Incredibly fantastic renderings. Looks better than real. Having sailed many years and helped in a few restorations, I thought I would attach some images to show you some of the generally accepted offsets of the Spray. The photograph of the Spray replica shows proper shaping of planks, quite beautiful, actually. Your render looks quite beautiful.
Some tweaking of the planks, and it will be a master piece. That will take care of the gaps and fair her hull. The thin strips on the bottom of a work boat like that just would never do. While there may not be exact plans of Slocum's boat, there were enough of these boats made and enough boat builders and designers who could and have passed that knowledge forward. Computers are great things and Rhino is right up there, especially for boat building. If you were to take the "Weston" drawings and use them as a template, proper lines would appear. This is one of the most famous boats in the world. There's a lot out there on it. I remember seeing a "Spray reproduction (interpretation?)" out of the water at Captain's Cove, in Bridgeport Connecticut. That was a long time ago. In the late '80's and I don't remember the registration number, but being a "Spray" replica, she drew a crowd around her. |
#15
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Bézier Splines & Rhino 3D
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I have to keep reminding myself that it's a model, the original no longer exists and as long as it looks like the photographs no one will be the wiser. The bow section shown above has the "look" and "feel" of the original. This is good. Boats and Rhino are two peas in a pod. In fact the Loftsman's Spline is the origin of what later became the mathematical basis for Rhino. First publicized by Pierre Étienne Bézier in 1962 who developed the mathematical algorithms [and named in his honor] for use in the design of car bodies. They stormed the world of computer graphics for nearly two decades before finally settling down. NURBS is and acronym which stands for "Non-Uniform Rational Bézier Splines"..., They are accurate to any precision desired and form the basis of CAD systems devoted to CAM. Rhino is just now coming into its own as a rapid prototype software environment with many extremely useful plugins now appearing making it an even more attractive software package. Checkout T-Splines for Rhino for organic shapesj..., Everyone who has ever drawn a curve in Photoshop or other 2D drawing packages has used a Bézier Spline. They are ubiquitous..., +Gil Last edited by Gil; 08-08-2011 at 10:35 PM. |
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#16
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I tell you that your ability to Render just blows me away. You wouldn't believe what we went through making the programs for bulkheads for CH53 and Blackhawk Helicopters. The ESS fittings on the Blackhawk were a night mare to make. Since my specialty was fixture design, trying to hold these parts on Datum points located on castings that did not sit still was most difficult. I wish I would have had Rhino to calculate the points instead of taking castings and using a 4 axis CNC machine to "locate' the data planes, then writing down the XYZ and B (Rotary) positions. Can't get into too much detail, but I know you already now what I am talking about. Rapid prototyping is a necessity. I think some people would be rather surprised to see what some ships are sailing around the world with, as far as machining and production capabilities.
I would be interested if you tried calculating the displacement of the Spray in Rhino. I used to captain a 10 meter Pearson, with a 50 foot mast and a 150 Genoa, and a full battened main sail, sloop rig (obviously). We had a Blooper too. It had a 6 foot lead fin keel so you had to steer her constantly, but her 12' 6" beam made her comfortable, and she could sail closed hauled rather well, which made coming home not so laborious, but she took off on a reach. Her name was Cadence. I really appreciate the history lesson on Rhino, I will be quoting that to some engineer friends, who are still not so up on NURBS modeling, which I do not understand. |
#17
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those are amazing pictures! Looks very artistic really, with the background, lighting and viewing angles - could almost be framed! Looking forward to seeing this unfold
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#18
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I agree with paperairforce those pictures could be framed! and they would look good too!
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Meow Wow |
#19
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More Hull Work...,
Hello All,
Thanks for all your kind comments. They are appreciated especially after a problem that takes 8 hours to find a work around, as in the bottom strake to keel joint. Another Rhino Gem: "When all loft commands fail fall back onto the "surface from network" command and crank up the precision". So after tweaking the strake cross sections the following render provides viewer relief [designer too]. Don't ask about the fantail as it still requires additional work to be an entry in the next post of "Boat Beautiful". Couldn't resist adding a deck + hull render just to show how it looks..., +Gil |
#20
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Sah.............weeet!
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