Indeed, I too am trying to make sense in what is still a bit of a chaotic situation. The various blogs en press releases seem to conflict sometimes. I just picked what seemed most likely at this moment.

With respect to game changing, whether the nacra 20 c. Is a game changer in elapsed time or not is largely meaningless with respect to curved foils. Right now it does appear that the clear performance of the nacra 20 c. is far more the result of typical specs like sail area hull length etc. then the curved foils. Otherwise the texelrating wouldn't be doing a good job of scoring the fleet, as evidenced again by the Thai regatta corrected results.

For those readers who don't know the texelrating system will give exactly the same rating to a boat with curved foils as one with straight foils. As such a curved platform should outperform its rating if indeed it these improve overall performance relative to old school straight boards.

Another point to take into consideration is the claim that the nacra 20c uses ASYMMETRICAL curved boards whereas other makes like F18 and F16 still use symmetrical boards. If so that will explain the length of these boards and the need to each time raise the windward one. It is doubtful whether the speed gain will offset the time spend working the boards in a crowded fleet race. Of course these things change in a distance race.

Indeed, all to advance an enjoyable discussion.