I can only give you a comment that was shared with me by Pieter Saarberg when we were discussing this. I also convey the content of a post that Jim Boyer posted about this subject a few years ago.

Pieters opinion is that canted hulls do work somewhat on light boats, singlehanders, like the A-cat but not much at all on the heavier boats like doublehanders or F18's. He also mentioned that the F18 class at the time seemed to move away from canted hulls. Right now we can say that this is truly the way the F18 has gone. I'm not sure wether the Capricorn F18 is a canted hull design but all others (newer designs or competitive design) are currently uncanted.

Jim Boyer said that his experience when going from the uncanted Mark 3 A-cat to the canted mark 4 A-cat was that the canted boat showing improved steerage in the middle speed range mainly; there was no noticeable speed range. Of course this improved steerage was welcome on the A's in these conditions due to the wildthing manouvre that seems to pay off here. Jim also stated that the Mark 3 and Mark 4 were largely the same boat with the canting as the exception. This could therefor be regarded as a pretty good comparison test in my opinion.

Some other designer, I forgot who (could be Jim), mentioned that a small payback was found in light weather when both hulls are in the water. However it was stated that since the boat must be wildthinged here that the payback was minimal although the outward canted board on the luff hull still seemed to be less efficient than the less canted normal board.

Wouter