On 10 Nov 2006 18:19:44 -0800, "Capt. Rob" wrote:

What is the absolute totally 100% without a doubt best book on sail
trim from basic to advanced?

North Sails used to publish some very good materials in conjunction
with something they called "The Fast Course". They also had an
excellent video called "The Shape of Speed". I probably learned more
about sail trim and rig tuning fron those two sources that anywhere
else.

The video was particularly excellent because they would focus the
camera on the draft stripes of the sails while they made adjustments
so you could see the change in real time and learn to appreciate the
elements of a fast shape and what it looked like. Good stuff if you
can find some copies or the up to date equivalent.