They recommended this one over the elliptical because
:
"This rudder offers a vastly improved shape you can see when compared to the original Catalina 34 and 36 rudder's. It is an NACA (National Advisory Committee for Aeronautics) 0012 airfoil considered by many sailboat designers to be the ideal combination of maximum lift with minimal drag."
We will see!!

"This rudder offers a vastly improved shape you can see when compared to the original Catalina 34 and 36 rudder's. It is an NACA (National Advisory Committee for Aeronautics) 0012 airfoil considered by many sailboat designers to be the ideal combination of maximum lift with minimal drag."
We will see!!