The F18 rules do have a minimum crew weight and is optimized as a doublehanded boat. Probably stipulates 2 people on board (not sure abt that). You could sail it in Open, but not at any F18 events and remain in class.
At the '06 Hobie 20 Nationals, Tony Probst single-handed his 20. The only requirement is the "crew" weigh the 295 pound minimum. He carried 5 or 10 pounds, I don't recall exactly. He did quite well even in the big stuff. He finished eighth overall including a bullet, 2nd, two 3rd's, a 4th and 5th. Previously he has raced the 18 solo, in Nationals as well. He had some very entertaining stories about the times he's fallen off!
Adding the spin is something I can't even fathom, but let Tony be your inspiration.
