Carl,

there have been lots of testing done with other rig configurations. The AYRS annals are full of them. None have been as good as the "marconi" rig upwind and downwind with spi. "Good" in this context means speed, ease of handling, reability, cost etc. etc. etc. Unless there is a significant breaktrough somewere, which I think is unlikely, I think the "marconi" rig of today will stay for a very long time. The only development I see coming is increased chord for wingmasts.

I noticed that there is a winged A-class to come very soon. It will be very interesting to see both the performance and the reaction within the A-class.. How many think it will be banned in no time? I know I do..