We have tried many different shapes and sections for rudders and all boats are now built with the standard D4 rudder design
We are sure its best to have a lightweight rudder as we believe its best to have less weight at the ends of the boat so the rudder is built of foam and glass. We finish all our foils with epoxy resin and graphite. This surface is sanded with 1500 wet dry sandpaper and is very easy to maintain and keep clean