Screw steamer

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File:SS Ukkopekka 1.jpg
The S/S Ukkopekka, a Finnish screw steamer

A screw steamer or screw steamship is an old style term for a steamship or steamboat, powered by a steam engine, using one or more propellors, also known as screws, to propel it through the water. Such a ship was also known as an 'iron screw steam ship'.

In the 19th century, this designation was normally used in contradistinction to the paddle steamer, a still earlier form of steamship that was largely, but not entirely, superseded by the screw steamer.[1]

The screw or propeller was first developed by Swedish inventor John Ericsson for the U.S. Navy. Ericsson was the principal designer of the monitor class of vessels.[2]

See also[edit]


  1. Canney, 1998 pp.11-13
  2. Canney, 1998 pp.26-27