hardchina Posted March 25, 2010 Posted March 25, 2010 Hi all, I'm looking for help with drawing some paper plans for an inflatable boat. the problem i have is working out the curves for a tube mitre joint, that can be drawn on a 2d pattern that relates to its 3d shape- is there an easy mathematical formula for drafting this? I'm really bad at explaining things so have taken a couple of pics.... the cut in this pic below is an s shape, doesn't show up well. when in 3d the cut is a perfect straight line. the only method i can think of is to use a 3d template (piece of pipe) cut to the required angle and mark out the fabric in its inflated state. Cheers Simon
psychlone Posted March 27, 2010 Posted March 27, 2010 Yes, there is an easy mathematical equation. Here are 3 hints! 1. First, though your shape is 3D, the template to create the 3D shape is still only a 2D template. 2. Think more in terms of geometry. 3. Also, try and think about using sine or cosine functions to determine the 2D template’s shape.
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