True, the I14 foils are just below the waterline; but point is they are designed to alter/modulate/modify the hull-induced wave pattern. I don't think it's a stretch to envision a design where a long gantry and specialized foil on a rudder can make the water think the boat is longer than it is. I find the concept intriguing. Question is whether on not the class wants to allow boats to go in that direction. And of course how effective such designs are on sailing around a course fast is debatable.