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How have screw propellers been modified?

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Twin-screw vessels were first introduced c.1860 in England. Located on either side of the rudder, the two propellers may be used to assist in steering; if one breaks down, the other can still propel the vessel. The introduction of steam turbines has brought about the use of four propellers on large ships. Screw propellers are made of cast iron, cast steel, or manganese bronze, the last being noted for its resistance to corrosion.

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