Large numbers of people worldwide enjoy the sport of dinghy sailing and many of these are fanatical about racing dinghies. In club after club members of the various classes battle against one another every week - and a prime consideration on how each sailor performs is the tuning of his/her rigging. This book, originally written over thirty years ago has been updated to reflect modern thinking however, the underlying core data continues to reflect essential information on how and why boats can be tuned to achieve better performance.