Harken 7410.11 MKIV Jib Reefing & Furling - Manual (Page 31)

MKIV Underdeck Unit 0 31
Operation Halyards/Headstay Tension
Backstay Adjusters
Backstay adjusters allow headstay tension to be varied to change sail shape to
match conditions. They permit a very tight headstay to be eased when boat is not
in use. For best performance, consider adding a backstay adjuster; either a block and
tackle, a mechanical adjuster like those offered by Harken, or a hydraulic adjuster.
Remember to keep headstay tight for best performance when furling or reefing.
If your boat is fitted with an adjuster be sure that it is tensioned before the
halyard is tensioned. If not, backstay adjuster may increase halyard tension and
could damage the sail or furling system.
Racing boats often slack the headstay completely when sailing downwind. Check
to be sure that foil does not jam against upper headstay terminal when backstay
is released. To prevent this, it may be necessary to shorten foil slightly.
On many boats it will not be possible to attach spinnaker
halyard to bow pulpit or it may be "sucked" into jib when
furling.
On some boats the spinnaker halyard lays across
headstay and will catch on halyard swivel, foils, or
jib halyard. To prevent problems it may be necessary
to install a masthead bail to move spinnaker halyard
block forward and to one side.
Boats with external halyards may find it necessary to
flip both ends of spinnaker halyard behind spreaders
to prevent fouling with furling system.
Headstay Tension
A furling system will work best if headstay is tight.
A loose headstay is difficult to rotate and can cause
unusual wear on foil joints.
To adjust headstay tension, first check to see if turnbuckle
is below deck. If so, make adjustments up under the bow.
If it is not below deck remove sail and follow instructions
on page 26.
Tip: Before adjusting headstay tension, slack mainsheet
and vang.
Spinnaker Halyards
Spinnaker halyards occasionally cause problems
with furling.
WARNING! In severe cases, spinnaker halyards
can jam furler causing loss of control of boat.
Make sure halyards are clear of top of foils
and halyard swivel.