The rating we are using for the Weta is 78.5. It is probably a little low. We don't have enough buoy racing records against other catamarans to have a feel for it. In an upwind/downwind course, it will probably do very well as it points well, tacks on a dime and has the reacher for downwind. It loose the waterline battle on a reach. It will do better if it is breezy as the Weta can handle heavy air very well.