Tuning Guide - X-99

Introduction

The purpose of this tuning-guide is to give our clients in the X-99 class some guidelines on how to get the most out of their North Sails. The tuning guide is made by Mads Christensen

Follow the guidelines, but always experiment and try finding your own trim. The weight of the crew, the balance of the boat, the stiffness of the mast together with specific local wind and sea conditions all have influence on the fastest and final trim.

Fig.1
Main traveller from Harken with automatic relase on leward traveller
Fig.2
Blocks for genua sheet is tied on the traveller instead of using sjakels
Fig.3
All blocks are tied with spectra rope instead of using shackles to reduce weight and increase flexibility
Fig.4-5 
Deck layout
Fig.6 
Special turnbuckels to ease trimming
Fig.7 
Spinnaker bag system, which makes it possible to move the bag forward in the cabin when not using the spinnaker

Mastrake

1. Take off your forestay
2. Bring it to the front of your mast
3. Mark the forestay just under the black mark.
4. Put the forestay back in its original place.
5. Measure from the black mark on your forestay to the centre of the
    pin-bolt when put back on its place
6. The lenght should be adjusted to the actual wind speed according to
    below table

Mast step

1. Measure from aft bulk head to back end mast step. (28-36mm)
2. Centre your mast at deck level according to your shroud position
3. Measure your J-measurement (forestay position at deck level to front
    of mast at deck level). This measurement should be 3450 mm.
    Maximum J-measurement according to class rules.

If you have any questions regarding trim or X-99 sailing in general, please contact Mads Christensen.

Good luck on the water!