I can envision a benefit of a lengthened gantry when using the T-foil rudders like the Stealth has as it could increase the anti-pitch leverage. I think this should be allowable if someone wanted to try it.

However, there is another type of foil rudders that could be a problem...Some of the skiffs have a long rudder gantry and a large foil that is not located at the bottom of the rudder, like John P's, but rather at the waterline. Some of these are adjustable on the fly; others are fixed. These foils can help stabilize the boat's attitude but can also act to increase the effective waterline, which should not be allowed in the F16 class.