Headsails shall have the distance between half luff point and half leech point of less than 75% or the footlength.
Headsails may be used on a furler system. In such a case, the furling system shall be used in association with one headsail only.
Headsails may be set on the forestay or set flying, i.e. with no sail edge attached to the rig. As a part of measurement process, headsails shall be flagged when set flying and/or having battens.
Inner jibs shall have their LPG of 110 % or less of Jmeasurement and shall be tacked inside another jib or spinnaker between the forestay and the mast.
When a headsail is tacked inside spinnaker or inside another headsail, if it is trimmed flat along the center line of the boat, the clew shall not be aft of the clew of the foremost headsail trimmed on the same way. Headsail measurements are similar to those of the mainsail, including the top width (JH) as well as four widths found on the leach between head and the clew: at 1/4 (JGL), 1/2 (JGM), 3/4 (JGU) and 7/8 (JGT) leech heights. Points on the leech are found by folding the sail to find equal distances between clew and head or between two adjacent measurement points. Additional measurements for headsails are: luff length (JL) and luff perpendicular (LPG) as the shortest distance from the clew point to the luff. Headsail area is then calculated as follows:
When the leech has a clear hollow or the headsail is not the largest in the sails inventory, measurements can be reduced to JL and LPG only.
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