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 significantly the amount of draft a sail can have. A sail is any type of surface intended to generate thrust by being placed in a wind —in essence a vertically-oriented wing. ... A seam, in sewing, is the line where two pieces of fabric are held together by thread. ... 2-dimensional renderings (ie. ... For alternate meanings, such as the musical instrument, see triangle (disambiguation). ... In geometry, a rectangle is a defined as a quadrilateral polygon in which all four angles are right angles. ... An airfoil (in American English, or aerofoil in British English) is the shape of a wing or blade (of a propeller or ships screw or sail) as seen in cross-section. ... In nautical parlance, draft is the depth below waters surface of the lowest part of a ship or boat. ...
Broadseaming is the slight tapering of each sail panel so that the standard width sail material is cut so that it's width is no longer uniform.
Not to broadseam and achieve the shape by luff round and foot round and relaxing the tension along the mast and foot is less expensive.
Even if broadseaming and luff and foot round is used to achieve the sail shape, the shape will probably be optimum for just a narrow range of wind speeds and at significantly lower wind speeds you will want a fuller sail and relax the foot and luff tension and get wrinkles anyway.
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