Harken 477 Small Boat underdeck furling - Manual (Page 5)

477, 478, 493 Small Boat Underdeck Furler 5
The drum assembly is designed to keep much of the water from entering the bow compartment. Water will drip
through the furler during rain or when sailing in heavy weather.
IMPORTANT! Furling compartment must drain.
The drum assembly is designed for either transferring the
headstay loads to the deck or for transferring the loads to
an underdeck chainplate.
If securing only to deck, make sure deck is strong enough
and designed for this purpose. A cored deck will not provide
adequate strength.
Use stay attachment below deck. A turnbuckle is used to
connect the chainplate to the bridge on the furler. It must
be carefully tensioned as the mast is tensioned to neutralize
the load on the deck.
Planning Installation Furler Requires Drained Compartment
Assembly Stay Loading
The Harken deck plate angle matches a stay angle of 72° when
compared to deck. Stay angle can vary between 71° and 73°.
IMPORTANT! If stay angle does not fall between 71° to 73° the
furler will be difficult to furl and may create excessive force on
deck and furler. To correct problem, change mast rake or make
shims using structural epoxy.
Stay Angle
Turnbuckle to Bridge
Turnbuckle
Bridge
71°–73°