Ship Rudders: Parts, Function, Types with simple diagram

                          The basic form of a rudder is a flat plate or sheet of material which is used to steer the ships, boats, submarine etc. Rudder operates by
directing the flow of water thereby making a turning moment which make the ship turn. Rudder is a steel structure formed by two plates of 10-20mm thickness. Modern rudders are streamlined to reduce the water resistance.
Below you can see a simple diagram of rudder,

Stock: It turns the rudder, passing vertically upwards to the steering gear through a watertight rudder trunk. Rudder stock is usually connected by bolted coupling so that rudder can be removed for maintenance without disturbing stock.
Bearings:- Weight of the rudder is taken by the combination of upper and lower bearing.
Drain Plug:- Drain plugs are provided for the drainage of water
Lifting tube:- it is fitted to allow unlifting of the rudder.
Rudder Pintle:- Pindle is a pin or bolt, which is used as a part of a pivot or hinge.

Types of rudders
>Spade or Balanced rudder
>Semi balanced

Balanced rudders or spade rudder
        A rudder has 20-40% of the area forward of the stock, similarly there is no torque on the rudder stock at certain angles, this type of rudder is called balanced rudder. The axis of the rudder is placed near to the center of gravity, so torque required to move the rudder will be very less. 

Semi balanced
  A rudder with 20% of its area forward of its stock is called semi balanced rudder. It is often found in twin screw ships.

Unbalanced rudder
A rudder with whole of its area aft of its stock is called unbalanced.

You Can answer following questions
> What is ship rudder?
> What are the Types of ship rudder?
> Draw and Explain the Parts of a rudder
> Why modern ship having streamline shaped rudder?
> What is rudder Pintle ?

If know more or Have Doubts Please Comment Below.

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