> "As a research aerodynamicist, I was dumbfounded when I first started reading the sailing literature as a beginning sailor and saw what a confused state sail theory was in. Even the basic explanations of how a sail generates lift were wrong. This I could understand, since even the popular aviation books were wrong in their attempts to explain lift. It is difficult to explain the generation of lift for laymen. The simplifications devised in attempts to do this seemed logical but usually turned out to be wrong"

He has a very readable section where he goes through the wrong explanations (e.g. Bernoulli effect) and explains why they are incorrect, and then corrects them with helpful diagrams.