kmisegades
Swamp Goose
Dear friends, I recently designed a new dagger board that promises a 20% improvement in performance, based on the ratio of side force to drag compared to the composite/FRP board I am now using. I am currently making a composite prototype to test the design on my boat. When this is done I will share more details. I am turning my design attention now to the rudder. At 60% of the area of the dagger board and with a rather poor profile and planform, there should be much room for improvement. Is anyone aware of a more detailed drawing of the current rudder design other than that attached? My primary interest is on the hydrofoil's cross-sectional shape. I have reviewed a thread from 2017 concerning the need for more area (or not), the sweep of the rudder (weeds) and to reduce weather helm. I am not really concerned whether my board and rudder meet ISCA specifications, but both should fit existing hardware just fine. While my focus is mainly on improving L/D (ratio of lift/side force to drag) I am eager to know what other concerns people have. Many thanks. Kent Misegades, Seven Lakes, NC