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Carlson Hull program
Danm, Scotty don't get that thread started again! :-)
"Backyard Renegade" wrote in message om... "Brian D" wrote in message news:Ro2Bb.270575$Dw6.918600@attbi_s02... Scotty, Don't be scared off. Buy some cheap 1/8" door skin and build a 1/4 scale model. Use duct tape as your 'adhesive'. Model my ass, that's the way I build my full size boats! Scotty You'll find most errors right off. Have some fun... Brian "Backyard Renegade" wrote in message m... "Brian D" wrote in message news:m9NAb.460002$Fm2.453789@attbi_s04... Keep in mind that shell plate expansion (what you are doing by hand and with software) is one of the more challenging parts of a hull design program. Even programs produced for more professional work, such as Rhino 3D and ProSurf, do not do a perfect job until you learn the ins and outs and tricks of the trade to make it work right ...a key one being tolerance management. It's very easy to create an issue with tolerance stacking, especially in an iterative calculation like what shell plate expansion uses. You can nearly always tell which designers actually built the boat they sell plans to or not by how large the errors are in the panels. I've heard of errors as large as 5" in a 20' boat for example. Another key is management of curve complexity. In a developable panel, this primarily refers to the combination of rate of change of curvature and also the tightness (radius) of the curves. To be accurate in such areas, the triangulation (what the software is doing) either has to be very tight across the board or vary as it goes. You'll find that every program is 'pretty good' to a point, then once beyond that particular constraint, the accuracy drops off. Try designing a boat with more gentle curves and see how it works out. If the software allows you to define a measurement tolerance, then lean towards making it tighter, not looser. You can loosen the specs after you have a finished panel that works, but don't do it in the calculation stage (kind of like not rounding off in precision until you report the final answer with the right number of significant digits.) So, the bottom line is: take heart, your experience is not out of the ordinary. Look into the settings that Carlson makes available and continue to try different approaches until it all comes together. Brian "William R. Watt" wrote in message ... Has anyone sucessfully built a boat out of unfolded panels from this hard chine design program? I just got my design for a 20 footer I am building back from the engineer (who I had go over the design a one time). I designed the boat in Carlson and was able to shape the bulkheads there. I was thinking about expanding the panels out and building that way but the more I read, the more I think I might just get them out the old fashioned way. Scotty from SmallBoats.com |
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