[Milkman128]

Agree on the potential scaling issues but the article suggests it operates different from a normal sail

more of how an airplane wing generates lift (bernoulli's principle) then catching wind.

[blabitty]

I'm just learning sailing but I believe traditional sails act like wings/airfoils as well, at least for part of the thrust.

[xyzzyz]

Normal sails also generate lift, which constitutes most of the thrust. Without it, it would be impossible to sail up wind.