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HUNTER
TUNING THE
RIGGING:
MAST TUNING INSTRUCTIONS:
Attach stays and shrouds.
After raising your mast, attach
the headstay, backstay, upper
shrouds and lower shrouds. Set the
headstay tumbuckle at 1/2 open and
then tighten backstay turnbuckle to
medium tension.
To center mast athwartships,
start with only slight tension on the
upper and lower shrouds. Check to
see if the mast is centered in the
boat by measuring from the
masthead to the chainplates with a
steel tape measure hoisted com-
pletely up the main halyard. Adjust
the upper shroud until the
measurements port and starboard
are exactly the same. Now the spar
is plumb athwartships, tension both
uppers equally, counting turnbckle
revolutions as you go. Tighten up-
pers until you have approximately 1"
of "prebend" fore and aft in the
mast. This is achieved because the
swept spreaders will push the middle
part of the mast forward as you in-
crease tension of the uppers.
Now tighten the lower shrouds
evenly making sure the mast re-
mains straight athwartship. Sight up
the luff groove to assure this
straightness. Lowers should end up
almost as tight as the uppers.
Tighten backstay to a taut position.
Perhaps 8.10 turns past your original
tension.
Check the mast tuning by sailing
in medium winds (10.12 knots).
Sometimes fine tuning of the upper
and lower shrouds Is necessary when
the spar is loaded In sailing condi-
tions. Sail on both tacks, sighting up
the luff groove to check athwartship
straightness. Both upper and lower
shrouds should not be loose on the
leeward side.
When mast tuning is complete,
install cotter pins in all turnbuckles
and tape over sharp edges of the
cotter pins with chafe tape.
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