We did some major research into a clients problems in light air performance. It was evident from recorded data that the yacht had excessive Leeway angles in lighter wind speed and in particular below 7kts. Modern yachts are depending on the keel and rudder surface to provide lift and rudder angles are critical to make the rudder provide that share of the total lift of the foils. After research it was apparent that the yacht had negative or neutral helm in the light and a balance problem. Increasing rake and moving the mast heel back should solve this problem and improve the performance.
