Broadseam is a term particular to the making of a sail. The panels that make up the sections of a sail are cut with curves on the connecting edges or seams. This method adds a three dimensional shape to what would ordinarily be a flat triangular or rectangular piece of fabric. Since a sail is a type of airfoil, this method of sail making adds sign...
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http://en.wikipedia.org/wiki/Broadseam
A seam in a sail, in which the edges of neighboring panels are cut in a convex curve, so that when sewn together the panels force fullness into the sail.
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http://www.glen-l.com/resources/glossary.html
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