Whirlwind sails is run by a guy who used to run Hobie's sail loft and also makes alot of windsurfer sails. So they know all about making fast sails.

It sounds like others have done this with the 5.2 so I will probably plan on getting the sail cut with a little prebend in it. Between the spin and the new sail I am going to have a turboed up 5.2.