14 Foot skiff rules - "Both members of the crew shall be in contact with the hull, fittings or gunwale assembly. Either, or both, may use a trapeze, individually or simultaneously. Trapezing is not allowed from any point outside the 4267mm length of the hull as defined in Rule 1."

Full rules here --> http://www.international14.org/images/pdfs/march%202010%20class%20rules.pdf

So do the F16 rules have anything in regards to aft wing extensions? And also describe what level of contact one must have with the boat?