X-Yachts X-99 Tuning Manual

X-99 Tuning Guide

NORTH SAILS

By North Diamond Sailmakers A/S, Denmark
and X-Yachts A/S, Denmark

To help you get most out of your sails we have put
together this X-99 tuning guide for you as a refeence
and a useful starting point.

I. MAST TRIM

1. The mast foot is placed in a distance of 38 mm from
the fiber glass inner section.

2. The forestay wire is held along the mast and marked
at the black mark at the goose neck. This mark is the
point of reference for the mast rake.

3. The mast rake is determined by measuring from the
mark on the forestay to the center of the pin; this
should measure 2260 mm as a basis.

4. The mast is measured when it stands straight
athwartships and the upper and lower shrouds are
tightened by hand, the middle shrouds are loose.

5. When the mast is straight, it is pinned
down with a piece of nylon which is
screwed through the mast collar so the
mast is centered in the boat.

6. When the mast is fixed at deck level the
upper and lower shrouds are tightened
on a of 8:7; the middle shrouds just
give a bit of support.

7. The fine tuning takes place during
sailing: up to 6 m/sec the mast is
totally straight, at more then 6 m/sec
the mast starts falling slowly to
leeward.

8. Sailing in less than 3 m/sec the mast is
raised a bit, but this means the upper,
lower and middle shrouds need
adjusting. As this is quite a lot of work
when the wind conditions shift often,
we normally keep the same mast rake
during all wind conditions.

II. SAIL TUNING

1. Mainsail (VM-5)

When you are sailing upwind, the mainsail should be trimmed with the traveller in the middle.

You must sheet the main so hard so that the upper tell tale is hidden on the back of the leech.

The 3 lower tell tales are blown straight from the battens. If you do not put enough sheet load in
the main, you risk making the main too hollow and the pressure on the rudder gets too great
and, therefore, the boat drifts off.

The adjustable running backstays are set just hard enough to make the wrinkles from the clew
to the spreaders disappear. This also causes the tension from the runners to be transmitted
directly to the forestay and, therefore, the profile of the sail is kept in the front of the headsail.

The middle shroud position on the genoa sheet track is to be at the bulkhead of the cabin as
you get a good angle on the mast.

Sailing with the spinnaker you loosen the outhaul to have enough mainsail depth in the bottom.
The kicking strap is tightened until the 2 upper battens do not "tip over" the upper shroud.

In light airs you sheet to the middle or just to windward of the traveller. The foot is eased so
there is a lot of camber in the sail, the same with the cunningham. The halyard is loose, just
enough tension as necessary to make the small wrinkles at the mast disappear. The running
backstay is also loose and there is no tension on the checkstay and top mast stay.

In medium airs you sheet in to the middle of the traveller. The outhaul is tightened until
near the black mark on the boom. Cunningham adjusts the camber. The halyard tension is
close to the black band at the top of the mast. The backstay has medium tension, the
checkstay has a bit tension to stabilise the mast curve. The top mast stay is loose. Kicking strap
is only used reaching or running.

In heavy airs you sheet 15 cm down on the traveller. Outhaul is set at maximum to the
black mark, cunningham adjusts the camber. Halyard max to the black band, the backstay is
set to maximum. The checkstay still adjusts the mast curve, therefore it is tensioned a little. The
mast top stay is loose. Kicking strap is only used reaching or running.

2. Genoa 1 (VG-6)

In light airs (0-3 m/sec) you sheet approximately 20 cm from the top spreader and 15 cm from
the upper shroud at the foot. The halyard is set so the wrinkles are just removed.

In medium airs (3-8 m/sec) you sheet approximately 15 cm from the top spreader and 5 cm
from the upper shroud at the foot. Halyard tension as much as necessary to remove the
wrinkles.

In heavy airs (8- 12 m/sec) you sheet 15 from the top spreader and to the upper shroud at the
bottom. Halyard tension precisely as much as you need to remove the wrinkles.

If you are sailing in varying conditions it is very important to trim the backstay constantly for
providing maximum power to the genoa.

While beating with a no. 1 genoa it is also very important to always trim the backstay to the
desired tension and afterwards adjust the genoa halyard.

Side 2/3