Appendices -- Useful Supplemental Information

Jacklines

Club-footed jibs and stays’ls must be fitted with a jackline to allow the sail to drift away from the hanks on the lower luff when the halyard is slacked. Casting off the halyard releases tension on the jackline. The jib hank stays on the stay, the luff pulls away as the sail is hauled down. Without this “relieving line,” none of the hanks below a certain distance up the luff could come down to the bottom of the stay for furling. Mainsails with small tack angles and track slides or hoops will also need a jackline. The jackline is anchored in a grommet a foot or so above uppermost hank, track slide, or hoop that needs “relieving,” passes through pairs of small thimbles seized around the luff rope, trapping the relevant hardware. Special jackline hanks with just a single hole are no longer in catalogs, so we resort to old-fashioned sew-on hanks with a small grommet seized between the holes, or, more commonly nowadays, a “bend on” hank with the tongue bent shut as in the illustration. A jackline might pass through three or four hank positions before being belayed at the tack ring. Line should be smooth, very low-stretch stuff. When the sail is set and the luff stretched the proper amount, the jackline should be as taught as possible without distorting the sail’s luff. Photo shows detail of a club jib, in Oceanus cloth, for a 40' sharpie ketch.



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