As I remember, the 2011 vs 2015, the '11 dives much more ('15 has larger bow), the '15 has a larger sail/mast. The '11 has a bucket seat...you literally sit in water (living in South Florida, I never minded that). The '15 has the new Vantage seat. The '15 has the same separation of the aka bars as the tandem; the '11 does not. Presumably the '18 will have the new aka/cross bar connectors. There are probably other things, but I believe those are the big items.
The 2015, and presumably the 2018, is a better sailing boat than the 2011. Still, I liked my 2011.
Keith
_________________ 2015 AI 2, 2014 Tandem
"Any intelligent fool can make things bigger and more complex ... It takes a touch of genius and a lot of courage to move in the opposite direction." A. Einstein
"Less is more" Anon
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