Here's the alternative presentation that I was thinking of. While it is ultimately about boat sails, note that its author was, at the time, a Research Superviso

Here's the alternative presentation that I was thinking of. While it is ultimately about boat sails, note that its author was, at the time, a Research Supervisor at Boeing's Aerodynamics Research Department. Take a look at figures 14 through 17, and their description. http://ljjensen.net/Maritimt/A%20Review%20of%20Modern%20Sail%20Theory.pdf http://ljjensen.net/Maritimt/A%20Review%20of%20Modern%20Sail...