As you will have understood from the video, the shape and dimensions of the keels on a catamaran have a direct impact on the boat’s performance.
It is essential to remember that for the same keel area, a greater keel height (and therefore a greater draft) will significantly improve the catamaran's performance on points of sail closer to the wind, without reducing its performance downwind.
Initial calculations even show that the boat gains 10% “efficiency” if the draft is increased by 200 mm and the “chord” of the keel is shortened.
Of course, this notion is very much linked to your individual use and your sailing needs. For example, some sailors will favor the pleasure of being able to get closer to the shoreline in an anchorage, or be able to take coastal routes, over performance.
The Excess LAB team is currently considering the best compromise regarding the height of the keels on the brand's future catamarans. For information, the current average draft is 1.35 m (Excess 12).