Rudder blade area

There are no regulation for the rating of the rudder area and very often crude empirical methods such as percentage of the underwater lateral area are used. 

This gives a rudder blade area of approximately 1.5% of the underwater lateral area LxT for ships of usual width; for the unusually broad ships (large mass, large windage area, low yaw stability) a somewhat larger value is given. This corresponds to typical rudder designs and can serve as a starting point for further analyses.

Download the Encyclopedia