>>If you make the hulls long and thin enough then they start acting like foils and anouther set of rules take effect.<<

Not really sure what you mean by this statement. "Act like foils"?? All surfaces traveling through a fluid are subject to the same set of rules. They will all experience forces parallel to and in the opposite direction of the flow (drag) as well as forces perpendicular to the flow (lift) dependant on incident angle.

Actually a shorter and wider hull is more efficient at producing vertical lift (similar to a hyrodfoil). To get an idea of this, look at modern Formula Windsurf boards. Extremly short and wide and are considered to be very high-aspect and efficient planing surfaces.

sm