Jeff, in my limited knowledge of these things, I can understrand how a sea anchor contributes staility by adding drag, but overall the "drag" on a hull? Slows it down but I've never heard to that as adding stability
of any kind. Directional stability comes from many things, drag is just a parasite that may be along for the ride AFAIK
Very interesting array of twin keelers, very different from what they used to be. Kinda scary to see rudders being used as supports though.