If you are talking about singlehanding an F16 with spinnaker, that IS a handful for ANYBODY. But the mechanical advantages available on boats these days make strength almost obsolete. <img src="http://www.catsailor.com/forums/images/graemlins/smirk.gif" alt="" />
Trimming the spin solo can get pretty tiring. If I were doing any type of moderate distance race I would mount cleats on the hulls so I could rest and/or do a 2:1 set up. Curry has spin cleats on his boat for the same reason.
