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Proas ContributionsFreeShip Walap
Posted by on 10/06 at 05:28 PM
A contribution from Aquiles Luna that solves the problem of modeling asymmetrical hulls in software that only thinks symmetrically. Thanks! I've found a way to force the freeware boat design softwareFreeship 2.6 to do proas, it may interest proafile readers.The problem is that such programs assume that the port and starboard sides are mirror images of each other, so you can build a catamaran or a trimaran, but not a proa. Then I remembered that proas *are* symmetrical, only the axis of symmetry is turned 90 degrees. The trick is simple: begin with the default design, and set the measures to say, 6 meters WIDE and 0.5 meter LONG. the hull will look weird at first, but once you move the control points around, it becomes pretty normal. Since the waterline doesn't have to continuous, you can extrude the akas forward and put the ama where freeship expects the bow. One unexpected benefit of this approach is that since features in the forward-aft axis are not expected to be mirror images, you can design an asymmetrical hull profile, like those used in micronesian proas. The hydrostatics and hydrodinamics calculations are useless, since they'll be done in the wrong direction, but I suppose this is a small price to pay. I'm donating to proafile a walap design, but this is only an example of the technique. I have no idea if the akas and ama proportions are reasonable, chances are it won't sail without modifications. If some reader gets inspired by my ideas and wants to inspire me back, this is my dream boat: a 6 meter, hard chined, stich-and-glue korkor. --Aquiles Luna Download Freeship (.fbm file) model  Comments
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