With respect to Mr. Robert's implementation of the "shared lift" concept:

1) Would increasing rudder size also increase the apparant "load"(for lack of a better term) on the driver? After about 70 miles, even the "finger touch" tillers tend to cause fatigue. Yanking pizza-pan sized rudders could certainly kill off the weak over 500 or 1000 miles!

2) I can visualize the advantages you describe in windward/leeward sailing (around the cans), but would there be any advantage in a distance format that ends up being primarily close-reaching (no spin)?