Quantum STAR 2003, Tuning Manual

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upwind, keep the aft end of the top batten parallel to the boom.
F) Mast forward at deck
Normally no mast lever needs to be used upwind. In light air some forward lever
can be experimented with. When reaching only use enough forward lever to
keep the mast from reversing, don’t induce any bend. The crew should check the
mast to make sure that it is straight. I set up my forward adjustment so it just
barely goes loose when sailing upwind in light air. This keeps the mast from
every reversing on a reach without having to pull any forward puller on. On the
run the it should be pulled on until the mast is straight. A good way to judge if
you have the right amount of forward puller on is to look at the windward
spreader. The spreader should be straight out from the mast. It may swing
forward in the puffs slightly and maybe in the light spots swing aft but normally
it's straight out.
G) Sliding mast butt
Some boats use a sliding mast butt. It originally was used on older boats that
didn't have enough room forward at the mast partner allowing the mast to go
further forward. It was discovered that it also loosened the shrouds so the
leeward spreader wouldn't cut in the main as much.
4. JIB TRIM
Pull the jib in until the leech lines up with the mark on the center of the spreader
and make sure the foot’s not too tight”. This is what we do about 95% of the
time. There are about 10 separate adjustments that affect the trim of the jib. The
adjustments that affect the jib are: jib halyard, jib tack downhaul, jib stay
position, rake, jib lead fore and aft, jib lead in and out, jib sheet tension, upper
backstay, lower backstay and even the mainsheet. For the most part you don’t
even have to worry about many of them, but I’ll discuss all of them and what
effects they have. First, I’ll try to describe the shape we are looking for.
A) Upwind Jib Shape
There are a lot of guidelines used for determining proper jib trim. What you are
determining is fullness and twist. The twist is the change in angle of the sail as it
goes up. An untwisted sail will have a small slot between itself and the main.
The top of the sail will be over trimmed and the sail will luff first down low. A sail
with too much twist will be real open at the top and will luff first. A good way to
look at twist is by using the battens. You will find that with the proper twist the
lower batten will be pointing to windward of the center line, the middle batten
straight back and the top batten pointing down to leeward. From experience we
have found that with the proper twist the leech intersects the spreader half way
out. You should have a mark on the spreader at 458 mm (18") off the side of the
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