Hi Mary,
Wings do add to a boats righting moment to sail area ratio as long as the sailors trapeze off the edge of the wing. Wings that sailors sit on are comfort things only. Wings make boats faster in medium and strong winds when they move the sailor's weight further outboard and away from the leeward hull which is the sailing system's fulcrum point. Higher righting moment to sail area is a powerful go fast device when the wind blows.
Who knows of a 20ft beach cat built in Florida with prepreg materials, a superlight boat, unirig with spinnaker, everyone thought it was going to be a rocketship. It was very fast in light winds, 5 knots. When the winds got up to 10 to 12 knots, other 20ft boats pulled even with it. When the winds got up in the 15 to 20 knot range, the superboat fell behind. What is wrong with this design? What was the mistake, the error, the oversight in this boat's design?
Bill