The SL16 is an ISAF recognized class, see http://www.sailing.org/15141.php .
So why not focus on the F16 class and not look to much at other classes, try to change it around, let others look at the F16 class.

Best regards,

Hans Klok

Web : http://www.catamaranparts.nl
Blog : http://catamaranparts.blogspot.nl
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Raptor F16 and A-class builder