Getting Faster in the X-99

An old but useful tuning guide from North Sails.

North Sails - generals book and CD about  trim and boat handling www.northu.com

Schroud tension used on www.X99.dk:

Polar Diagram and table based on Swedish IMS certificates.

The diagram above is based on an IMS data file and is provided by Janini, NOR 9539. This is how an X99 should sail according to IMS.

Beat performance based on emperical data:

The above performance is calculated and based on emperical data recorded on DEN 407 and DEN 530 from 1995 to 2003

NACA 65 profiles if you want to optimise your keel. Estimate 200 hours if you want the job well done.

Relevant literature:

The Art and Science of Sails, Tom Whidden and Michael Levitt, ISBN 0-229-11888-7.
A guide to modern materials, constructions aerodynamics upkeep and use.

Theory of Wing Sections, Ira H. Abbott and Albert E.von Doenhoff, Dover publications, Inc. New York.
NACA profiles.

Principles of Yacht Design, Lars Larsson and Roelf E Eliasson, Adlard Coles Nautical, London, ISBN 0-7136-3855-9.
This book examine every aspect of the process of yacht design and is a useful tool if you want to optimise your keel design and your under water hull surface.

Illustreret Sejl og Rigtrim, ISBN 82-91443-07-6, En Norsk bog om sejltrim.

The Rules in Practice, Bryan Willis, Fernhurst.
The new Yacht Racing Rules recommended by Claus Kildegaard, D286 Xanthippe.

The Yacht Racing Rules, Lindis International, +44 01986 785476.
A complete guide on CD ROM.

High Performance Sailing, Frank Bethwaite, recommended by Stefan Marechal