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Vertical Batten In-Mast Furling Mainsails
Adding vertical battens improves the performance of in-mast furling mainsails by allowing the sail to be built with roach (the area of a mainsail that protrudes beyond a straight line from the head to the clew). Having roach makes the sail bigger, and gives it a much more efficient aerodynamic profile. Even with vertical battens, the sail still has to be cut relatively flat so it will roll into the mast properly. To support even a modest amount of roach, the battens have to be twice as long as standard horizontal battens.