Fantastic computer graphics systematically explain how to tune-your-yacht, keelboat or dinghy. This beautifully illustrated & well-organised book shows the reader step by step, how to trim their sails & rig for maximum performance. Ivar Dedekam`s revolutionary approach to sail & rig tuning tackles the practical & realistic elements of tuning your boat as well as the theory of sail aerodynamics. The book covers the many variations in boat, sail & rig design.