Harken 7415.15S MKIV Hydraulic Jib Reefing & Furling - Manual (Page 25)

MKIV Hydraulic Unit 5 25
8 - 10°
Commissioning Halyard Swivel Height/Lead Angle
To prevent wraps, the halyard must exert a slight pull to the rear.
This allows the foils to turn while halyard remains stationary.
Prevent Halyard Wraps
1. Halyard swivel should be within top 6 - 8" (150 - 120 mm) of foil
unless a halyard restrainer is used.
2. Halyard must pull slightly to rear (8 - 10°).
3. Halyard must be snug, but not too tight.
If halyard wraps, do not force unit to turn. Attempt to open sail by
carefully furling in and out a little at a time. If sail will unfurl, lower
it by releasing jib halyard. Severe halyard wraps can only be cleared
by going aloft and freeing halyard.
If sail will not furl or unfurl, try to remove jib sheets and manually
wrap sail around headstay.
Testing at dock does not indicate halyard angle is correct. In wave
action, halyard may wrap if lead angle is not correct. The 8-10°
diverging angle shown at right is critical.
Pendants
If the your sail luff is not long enough to position halyard swivel properly,
you must add a pendant. Pendants should be made of plastic-coated wire
and be permanently attached so sail height will be correct. Adjustable-
length pendants are not acceptable, as they might not be adjusted
correctly during a sail change.
1. Raise sail, but do not attach tack shackle.
2. Position halyard swivel correctly near top of headstay.
3. Secure halyard.
4. Tie a piece of rope to sail tack.
5. Lead line through tack shackle on lower unit.
6. Tension sail.
7. Measure distance from tack shackle to sail tack and permanently
attach pendant of this length to head of sail.
8. Repeat procedure for every jib in your sail inventory.
Halyard Wrap
The most serious problem with furling systems occurs when the jib
halyard wraps around the headstay foil. Halyard wraps will keep you
from furling or unfurling and may cause serious damage to the unit
and the halyard.
WARNING! In severe cases, a halyard wrap can cause loss
of control of boat and/or headstay can break suddenly.