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Junk Rig Sail Designer Program

  • 26 Sep 2026 15:23
    Message # 13718672

    https://junkrigsaildesigner.com/

    Using AI I made a program that generates junk sail designs.

    There are two tabs near the header, one for assembly which shows the overall sail, and one for panel patterns, which shows each individual sail panel. The panel patterns tab has the option to output SVG, DXF, and G-Code files, all of which output correctly, I believe. Each panels include a seam allowance.

    By default the sail is rectangular, which I favor, but a fan style head can be applied, with its own set of parameters, that can make some very interesting looking sail outlines. Shape, or camber, can be added to or removed from any sail panel, but the program attempts to set it at 1/3 down from the head of the sail by default and recalculates according to user input. The aspect ratio is also locked initially, so changing the foot of the sail effects the height automatically, but when the height of the sail is changed, the aspect ratio becomes unlocked until the page is reloaded.

    Initially, the program uses straight lines which is how I usually make my sails. However, it has the ability to bend these straight lines. The sliders to do so are found by clicking on a sail panel, which opens a menu that has an option to make the camber lines more hollow or round. The settings for the camber curves are very sensitive, so the sliders are almost useless at the moment, and entering numbers manually into the text box such as 0.01or 0.03 is more effective. Otherwise the shape of the sail becomes outrageous quickly.

    I see many improvements that could be made, but as it is relatively working, I would like input from the community before making too many more modifications to the program. Any feedback would be much appreciated!

    -Colin Clayton

       " ...there is nothing - absolutely nothing - half so much worth doing as simply messing about in junk-rigged boats" 
                                                               - the Chinese Water Rat

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