Page 60 - The Complete Rigger’s Apprentice
P. 60

Jiggers

               Load on a halyard varies over its hoist; at first
               you’re only picking up the weight of the sail, and
               perhaps a gaff or square yard, and the going is
               relatively easy. But at the end, when you want to
               tighten the sail up for an efficient shape, the going
               is decidedly difficult.
                  With most contemporary boats, it’s the winch
               that applies the final, heavy load. But on gaffers
               and square-riggers, it’s done with a jigger: The
               halyard is double-ended; one end leads down to
               deck on one side of the mast and is pulled on by
               hand as far as possible, then belayed; the other end
               leads down to deck on the other side of the mast
               and has a three-, four-, or five-part block-and-  Figure 2-21A. Bullet blocks spliced into the ends of
               tackle hanging from it. This purchase compounds
               the primary purchase aloft. That is, if your throat   sheet pendants provide a two-part purchase, an alter-
               halyard has a four-part purchase, a jigger of three   native to winching on traditional craft. The blocks are
               parts will give you a 3 5 4 = 12-part purchase at   shaped to prevent snagging on the stay during tacks.
               the end of the hoist for easy luff tensioning. You   The pendants are sometimes called “lizards.”
               could, of course, make up a 12-part primary pur-
               chase, but then you’d need a halyard three times as
               long, and there’s already enough string to deal with
               on a gaffer.



             advantage, you can have either power or speed, but
             not both. If, for example, your mainsheet has a 2:1
             advantage, it may bring the boom in very fast, but
             only in light airs. If you change up to a 5:1 advan-
             tage, it’ll be easier on your arms, but a slow, slow
             experience. What will be the ideal compromise, for
             you, between ease and speed? One solution might
             be to combine a fast, low-power purchase with a
             winch. The powerful, slow winch would sheet things
             in in heavy airs, while the block and tackle would
             stand alone in light airs. But do you want to invest in   Figure 2-21B. A hardwood “lizard” is a sheaveless
             another winch? Will it work in your cockpit?  alternative to a single block for small craft or for
                Most sailors just go with whatever the boat   smaller sails on large craft.
             comes with, and may not even realize that there are
             alternatives. But rigging materials are specialized in  than a SORC ambience, look for ones that look the
             order to suit any sailing style; you might as well get  part. Read technical data about them. Ask around
             what suits you.                             about the reputation of the brand or brands you’re
                Racing craft feature blocks that are extraordi-  considering; there are some good-looking lemons
             narily light, strong, low-friction, and high-cost. This  out there.
             is appropriate. But racing considerations pervade
             the sailing craft marketplace to a ridiculous degree,  Rope-Stropped Blocks  
             so that the gear of most craft is not appropriate. If  As the diagrams in Figure 2-22 show, I have a thing
             you’re more interested in a solid, repairable block  for rope-stropped blocks. Not exactly an off-the-

                                                                                                       39
   55   56   57   58   59   60   61   62   63   64   65