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MEASURING
All Mainsails
Jib/Genoa/Staysail
RF
Jib/Genoa/Staysail
It is a line running from the tack of the sail up the luff approximately the distance of four slides. This line is secured to the sail at the top and tied to the fitting at the tack. The jackline is threaded through pairs of grommets that are on the luff of the sail. Hardware to attach the sail at the intervals is threaded on the line between each thimble pair. When the sail is hoisted, the line is tight and the hardware is pulled tightly against the edge of the sail between the thimble pairs. When the sail is lowered, this hardware falls away from the edge of the sail on the relaxed line. It really is a very simple concept.
A jackline is used along the hoisted edges of a sail to make it possible to pull the sail away from the mast or the stay while it is lowered. They are especially useful in reefing mainsails that are secured to the mast with slides or slugs trapped in the spar. As the hardware comes down the mast and stacks up at the stopping point on the track or slot, the jackline permits the sail to be pulled away from the mast and down to the boom where it belongs.
