Hang Glider wing: How to make a rib's curve tangent to the intersection curve made by a wing's tube penetrating rib's plane?
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You can "cheat" a little bit with "spline on surface" (in a 3D-Sketch) which are connected on the rib plane. The spline should be a closed loop, this will give you a ellipsis. on this sketch can you connect now the rib-sketch.
In the zip-file is my experiment.
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Step 1: