Hey Luiz, NO boat is a cruising boat, if another one appears within 100 metres of it!! The race is on!!
In relation to the foils on a Hobie, I thought that was what I said - the front (leading edge) of the T foil lower (Pointing down) than the trailing edge, positive lift downwards at the transom??
Both T foils and L foils have their place on the wings of aircraft, If the foil is included as part of the wing in the design then a high aspect "curved" tip ending in an L foil is highly efficient (and desirable). When an existing "standard" straight wing ending in a "squared" off tip has tiplets added, T foils are more effective in “reducing “tip vortex than a single upward pointing foil with a "hard" angle at the transition between tiplet and wing. (Although just one “hard” angled tiplet is still more efficient than no tiplet at all). As I said earlier, the main detraction for an L foil on a cat is the manufacturing “difficulties” to compensate for it’s greater loads, not its undeniable efficiency as a continuation and integral part of the rudder.