Harken 7413.10 MKIV Jib Reefing & Furling built after Feb. 2009 - Manual (Page 34)

Operation Reef/Secure Sail
34 MKIV units 3, 4
Reef
A sail may be partially furled before you resume
sailing. This is known as reefing.
Many sailors find it helpful to place marks on
foot of sail so they can reef to a variety of
predetermined jib sizes. This allows marks to be
placed on jib lead tracks or toe rail so that lead
block position can be changed to correspond
to reefed jib.
Sails are generally reefed to balance the boat
and to reduce heeling moment. Sails can also
be reefed to improve visibility, or to slow boat
while sailing in congested areas such as
entering or leaving harbors.
Secure Sail
When furling the sail completely, make sure sheets and furling line are secured.
Check amount of line on the spool compared to the furled sail before using the system.
A furled sail must have:
a. Two to three wraps of the jib sheet around sail.
b. Two wraps minimum of line wound on spool.
c. Furling line securely cleated.
d. Jib sheets securely wrapped on winch and held in self-tailing jaws.
Furl at dock with tension on sheets to duplicate furling in high wind.
Remember sails furled in light wind and left loosely secured can be a problem
if wind increases.
IMPORTANT! Remove sail from furler if extreme winds are predicted,
especially if boat is left unattended.
IMPORTANT! Check all points above—a, b, c, and d—when leaving boat
to avoid damage to furler or boat.
A loosely rolled sail can catch wind in a storm. Sheets or furling lines can loosen
as winds increase and allow furler to unroll. If there are no line wraps on spool, the
line deadend can break the drum when the boat motors through waves.
Be sure mooring lines are not placed across furling line where they may
cause chafe.
a. 2 – 3 wraps
If you want to:
Add more wraps of
jib sheet on furled sail.
Untie jib sheets and keep sail
completely rolled. Secure with
sail tie.
Turn spool to unroll a
several of wraps of line.
Retie sheets.
Add more wraps of line
on spool. Turn spool to add a
several of line.
B. 2 – 3
wraps