MKIV hydraulic unit 3
27
8 - 10°
Commissioning
Halyard: Swivel Height/Lead Angle
Pendants
If the sail luff is not long enough to position halyard swivel properly, a
pendant is required. 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 adjust
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.
1. Halyard swivel should be within top 100 - 152 mm (4 - 6") 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 removing jib sheets and manually
wrapping sail around headstay.
Testing at dock does not indicate halyard angle is correct. In wave
action, halyard can wrap if lead angle is not correct. The 8-10°
diverging angle shown at right is critical.
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
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 can 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.
Make sure halyard is clear of top foil before using system.
WARNING! Sail must be fitted to foil length before using
to prevent headstay loss which will cause an accident.
