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Rudder, Rudder types Twin rudders, i.e. two rudders, are fitted on ships with twin screws or twin propeller arrangement., Rudder constructional features A closing plate is fitted on one side of the rudder. This closing plate is the last piece of plate to be fitted after carrying out internal weldings of the rudder, Rudder constructional features Lifting eyes are provided for lifting and dismantling of the rudder, Rudder constructional features Coupling palm is normally provided at the top of the rudder for attachment to the rudder stock, Rudder constructional features Plates stiffened by horizontal & vertical webs, Rudder constructional features Drain plug provided at the top and another at the bottom for drainage, coating and testing purposes, Rudder is an underwater appendage, the surface of which is used to generate sufficient force to steer the ship when it is in motion, Rudder constructional features Streamlined profile, Rudder types Single rudder is fitted in ships with single tail shaft or single propeller