Harken 477 Small Boat underdeck furling - Manual (Page 15)

477, 478, 493 Small Boat Underdeck Furler 15
Consult specifications for swivel and drum pin-to-pin lengths to determine luff length deductions. If using optional
hoistable halyard swivel, make sure to deduct for this.
Standard Upper Swivel Only
Sailmaker will often install a 1 x 19 stainless steel wire sewn into the luff with thimbles that are secured to the tack and
head so they will not turn while furling. In this case, the luff wire becomes the headstay. The jib remains on the boat in
its furled position when it is not in use and a cover protects the sail from UV exposure. Alternatively a temporary “mast
assist” line is used.
Direction of Wire Lay (All Installations)
When installing wire, coordinate the lay of the wire with the direction of furling so that the twist in the strands are
tightening when the sail is pulling aft as it is furled. Spool is charged clockwise. This means that the sail is rolled in
a counter-clockwise direction during furling. As a result, the wire should tighten when sail puts a clockwise load on
the strands.
Note: The outside of the roll will be on starboard. See diagram below.
Hoistable Halyard Swivel: If a hoistable halyard swivel is used, the sailmaker will use
a luff sleeve or small snap straps so that the sail can be hoisted onto a permanent stay
and removed with the headstay left in place. Make sure the head and tack thimbles are
secured to the sail to handle furling loads.
IMPORTANT! Load hoistable halyard swivel onto stay before terminals are assembled.
Use tangs to provide a sail attachment to lower furler. A sailmaker eye may also be used.
Appendix Sailmaker Instructions
Attach furler
to this hole
Attach headstay
to upper hole
Secure sail
here
End of halyard
swivel with
circlip faces up
Circlip
Wire should tighten when
sail puts a clockwise load
on the strands. Outside
of roll is on starboard.