The Rudder was invented by the Chinese in the "First century
A.D"
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The rudder stears the boat
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Rudder trunk is a space between carrier bearing and bush of the
rudder stock of a ship's and the space is located just above
rudder.
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A wheel is connected to the rudder, when you turn the wheel it
turns the rudder. The water flowing by the boat is pushed in either
direction by the orientation of the rudder.
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It helps stear, the size of the rudder depends on the size of
the ship