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So to be honest I'm still not totally clear on the difference between the tracks and the barber hauler. They still seem to be doing the same thing just rigged differently.

I've got a background in aviation so the physics and aerodynamics/ hydrodynamics of it all wouldn't be too far over my head.

Can you guys recommend any books on the subject? Something that talks about the science behind the sails, maybe about this "pocket" a few have mentioned, the relationships between the jib and the main....that kind of stuff.