Rudder blade are classified in three ways. According to the position of the rotation axis: the rudder can be divided into the unbalanced rudder , semi-balanced rudder and balanced rudder . According to the connection type with the hull..

Marine Semi-spade rudder The upper half of the semi-spade rudder is supported on the rudder button at the rudder post or on the rudder arm, and the lower half is a spade rudder. It is mostly used for sea-going ships that do not require high performance and as a side rudder for inland ships..