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Carlson Hull program
How about trying the free version of Rhino: rhino3d.com.
You can't save but you'll see what it does. The command to create developable surfaces is in /surfaces/loft/developable. Maybe it will accept to import your current model, that way you can see where the problem is. -- Jacques http://www.bateau.com "William R. Watt" wrote in message ... "Jacques Mertens" ) writes: The Carlson program develops panels correctly but that doesn't mean that those panels are developable. I've seen the paper and pencil method of looking for the apex of curvature in a couple of boatbuilding books, TF Jones for example. For the design I'm working with constant bevels restrict the bend to one plane. As you mentioned below I eyeball the pictures displayed on the computer screen to make sure the station lines are parallel (no twist). Avoiding twist in the panels at the stem shortens the waterline length but that's a (small) price I pay for simplicity in design and construction. All I have to worry about is that the radius of curvature is not to tight for the thickness of the plywood to bend to. Admittedly I haven't done any radius calcutations. With a bow half angle of 32 deg I think its okay. One more thing to put on the "todo" list. All the ones I know are based on the Kilgore algorithm. Through an iteration process they check for ruling lines: straight lines that are included on that surface and run from one edge to the other without intersecting. There is more to it but that is the basic problem. Thanks. I've written down the name and will look for more info as I would like to learn how it's done. Over the years I wrote about that in this group several times: the Carlson program is good if you start with a hull that is developable. It is a valid tool to scale up and down an existing boat, create patterns etc. Yes, all I want from the Carlson program are the plotting points for the plywood panels on the sheets of plywood. I used the Blue Peter program initially to flesh out the hull with stations (the program rounds the chines as you ask it to insert more stations) and to do the design calculations, then printed out the offsets and typed them into the Carslon program. I naively expected to get accurate plotting points with a couple of clicks of the mouse. -- -------------------------------------------------------------------------- ---- William R Watt National Capital FreeNet Ottawa's free community network homepage: www.ncf.ca/~ag384/top.htm warning: non-freenet email must have "notspam" in subject or it's returned |
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