I had an asymmetrical spinnaker on a previously owned M 15. I used it a few times, but found that the working sails worked almost as well because of the main taking some of its air down wind. But I did have the sail made a little smaller than my sail maker recommended. Bert Felton M 15, #365 Zephyr ************** It's Tax Time! Get tips, forms, and advice on AOL Money & Finance. (http://money.aol.com/tax?NCID=aolprf00030000000001)