What could ultimately be different between the two breeds of IMOCA 60s is complicated, says Enright, followed by a long and calculated pause. For one, there will be more helming and less full-time reliance on the autopilot. There are the side foils, of course, and their infinite range adjustments, the sail inventory, the stacking of those sails, as well as the mechanics of getting them up and down with only five crew, likely divided into doublehanded watches. Then, there’s where everyone is going to fit, sleep, store food, spares and media equipment. The racecourse itself presents a different menu of design variables, too.