Noticed some of the foiling cats use an adjustable dagger board type rudder --seems like a logical means of adjustment for conditions --the 72 fters have an array of different size rudders they use for that days conditions as I understand it from the TV sources.
Interesting that they named the C Class championship the Little Americas Cup back 5 + decades ago when the Americas Cup was in conventional yachts never imagining the Americas Cup actually ever being sailed on cats much less 72 ft foiling cats going at 4 times their speeds. Now the C Class has essentially become the development class for the Americas Cup-.
Those of us that have been proponents of cat sailing saw this as a natural progression --most traditional sailors --Jobson ie --were resistant to it.
One of the books that first got me interested in Cat sailing was by Reg White from the UK on cataaran racing and experiences racing C Class cats in the early days of the sport.
Here is another nice looking "petite coupe" C Class foiling cat ---
