Thanks to everyone for all the great responses. I think I understand the differences a little better now.
I didn't realize mylar and dacron could be used together; I thought it was either one or the other.

Which cut would be better for racing: a square top or a pin top? and can this be done on a dacron and a mylar sail?
Some of the Isotopes I race with have pin tops and others have square tops.


Mike H- Thanks for the welcome. I was very glad to find this forum.
John W- Yes-the Isotope is a great boat and it definitely is a fun boat!