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.
