I've never had to u-turn on my Nacra but I have done it quite a bit on the H16. It was mostly out of laziness since we were just cruising around. My friend who I sail with on the H16 tacks it very well, but if we are doing one of our "unofficial" races around the bouys, I always try to get him into a tacking duel. He may not completely blow a tack, but sooner or later he will hit a slow one and with the daggerboards I very rarely blow a tack. I have to back out about once every 4 tacks when I sail the H16, but I am not the best skipper on that boat.
-Rob V.
Panama City
Nacra 5.2