A sx with no wings and a standard rig would be a TheMightyHobie18. There were several sx's with wings that were simply magnums. No tall mast or different sails. As far as I know, all hulls, foils, etc are the same. It was the tall mast with mylar sails and spin that made the boat different. The extra wt and comptip did not make the boat competitive. I think the sails were european designed and were never tailored to fit the comptip. It was actually a factory frankenboat to begin with that did not work well. To gain any credibility, you will have to start with the proven TheMightyHobie18 number and go from there, at least in my opinion, Rick (hope to see you out this fall, whatever the number)