Nick and Gord - maybe the term jackline is not correct. I was told that was the proper term by other forum members, in previous threads.
I am referring to the line, seen in the photo
, that attaches the bottom several slugs to the sail luff. As you ca nsee, the slugs are not sewn / attached directly to the luff. Instead, a line is threaded through small grommets on the luff, and there is a slug threaded as well, every two grommets on the luff. I think that this is / was common on other boats.
In a previous thread, I referred to this line as a "boltrope", but was told that the proper term was jackline.
Nick - our boats are so different in size, and systems (you with battcars). On my boat, the bottom several slugs pile up in the track, as the luff is lowered to reef. When the slugs pile up too high, and the 2nd reef cringle is attached to a slug as well (through the jackline , boltrope, or whatever it's called), the cringle cannot phyically pull down low enough to reach the gooseneck / boom, as there is not enough slack in the line holding the slug (nearest the cringle) to allow the cringle to be pulled lower.
As mentioned, I have to either take out the bottom slugs (to allow the upper slugs and cringle to come lower in the track) or loosen the line through the slugs, to create enough slack for the cringle to come down further.
I was under the impression that these lines were used as the may have advantages over having all slugs sewn directly to the sail.
I may be able to modify the mast track slug opening, to allow the slugs to slide further down the track, (and not fall out).
Quote from sailrite
are used along the hoisted edges of sails
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. Headsails that are secured to a boom also benefit since the distance from the clew to the stem is longer than the distance from the clew to the stay -- when the sail is lowered, it must pull away from the stay if it is to be lowered all the way.
First let me describe the principle behind a jackline. It is a line running from the tack of the sail up the luff a distance roughly equal to the width of the sail at its base. This line is secured to the sail at both ends. At intervals of from 26 to 30 inches along this length, the line is threaded through pairs of round brass thimbles that are sewn to the edge 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
Grommets are installed along the sail to secure the ends of the jackline. Two more grommets are installed at each intermediate point. Brass thimbles are sewn to these intermediate grommets as show in the figure below. "
Here is another link: (I thinbk I have been doing something wrong - there may be a better way for me to set things up. Have to give it a good read!)
Photo Album of Slug placement for reefing, Mastgates and Jacklines