One lesson learned with Nacra’s 17-foot Olympic cat is that without stabilizers on the rudders, the boat has a tendency to jump when you don’t want it to. Even for Olympic hopefuls, the Nacra 17 is a handful. The 15 had to have a wider margin of error to satisfy parents, coaches and clubs. The boat tested with curved daggerboards (the daggerboard slots accept both curved and straight boards) and rudder winglets on the rudders. However, Larsen said that other stabilizing options for the rudders were being evaluated, given the potential safety concerns of kids, capsizes and sharp edges.