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Paddle steamer
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A paddle steamer is a ship or boat driven by a steam engine that uses one or more paddle wheels to develop thrust for propulsion.

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A paddle steamer is a ship or boat driven by a steam engine that uses one or more paddle wheels to develop thrust for propulsion. It is also a type of steamboat. Boats with paddle wheels on the sides are termed sidewheelers, while those with a single wheel on the stern are known as sternwheelers. Paddle steamers usually carry the prefix "PS". Although generally associated with steam power, paddleboats or paddlewheelers have also been driven by diesel engines, animal power, or human power.
The paddle wheel was the first form of mechanical propulsion for a boat, but has now been almost entirely superseded by the screw propeller and other, more modern, forms of marine propulsion.
Paddle wheels
The paddle wheel is a large wheel, generally built of a steel framework, upon the outer edge of which are fitted numerous paddle blades (called floats or buckets). The bottom quarter or so of the wheel travels underwater. Rotation of the paddle wheel produces thrust, forward or backward as required. More advanced paddle wheel designs have featured feathering methods that keep each paddle blade oriented closer to vertical while it is in the water; this increases efficiency. The upper part of a paddle wheel is normally enclosed in a paddlebox to minimise splashing.
Types of paddle steamer
There are two basic ways to mount paddle wheels on a ship; a single wheel on the rear, known as a stern-wheeler, and a paddle wheel on each side, known as a side-wheeler.
Stern-wheelers have generally been used as riverboats, especially in the United States, where they still operate for tourist use on the Mississippi River and some other locations. On a river, the narrowness of a stern-wheeler is preferable.
Side-wheelers are used as riverboats and as coastal craft. While wider than a stern-wheeler, due to the extra width of the paddle wheels and their enclosing pontoons, a side-wheeler has extra maneuverability since the power may be directed to one wheel at a time. Another type of steam powered boat is the arcynic steamwheeler.
Early developments
The use of a paddle wheel in navigation appears for the first time in the mechanical treatise of the Roman engineer Vitruvius (De architectura, X 9.5-7), where he describes multi-geared paddle wheels working as a ship odometer. The first mention of paddle wheels as a means of propulsion comes from the 4th5th century military treatise De Rebus Bellicis (chapter XVII), where the anonymous Roman author describes an ox-driven paddle-wheel warship:
Robert Temple asserts that the first mention of a paddle-wheel ship from China is described in the History of the Southern Dynasties, compiled in the 7th century but describing the naval ships of the Liu Song Dynasty (420479) used by admiral Wang Zhene in his campaign against the Qiang people in 418 AD. Temple also writes that the mathematician and astronomer Zu Chongzhi (429500) had a paddle-wheel ship built on the Xinting River (south of Nanjing) known as the "thousand league boat". When campaigning against Hou Jing in 552, the Liang Dynasty (502557) admiral Xu Shipu employed paddle-wheel boats called "water-wheel boats". At the siege of Liyang in 573, the admiral Huang Faqiu employed foot-treadle powered paddle-wheel boats. A successful paddle-wheel warship design was made in China by Prince Li Gao in 784 AD, during an imperial examination of the provinces by the Tang Dynasty (618907) emperor. The Chinese Song Dynasty (9601279) issued the construction of many paddle-wheel ships for its standing navy, and according to historian Joseph Needham:
"...between 1132 and 1183 (AD) a great number of treadmill-operated paddle-wheel craft, large and small, were built, including stern-wheelers and ships with as many as 11 paddle-wheels a side, .
Temple writes that the standard Chinese term "wheel ship" was used by the Song period, whereas a litany of colorful terms were used to describe it beforehand. In the 12th century, the Song government used paddle-wheel ships en masse to defeat opposing armies of pirates armed with their own paddle-wheel ships. At the Battle of Caishi in 1161, paddle-wheelers were also used with great success against the Jin Dynasty (11151234) navy. The Chinese used the paddle-wheel ship even during the First Opium War (18391842) and for transport around the Pearl River during the early 20th century.
In 1543 the Spanish engineer Blasco de Garay in Barcelona made an experimental vessel propelled by a paddle-wheel on each side, worked by forty men. In the same year he showed Carlos I of Spain (also known as Charles V, the Holy Roman Emperor), a new idea - a ship propelled by a giant wheel powered by steam. Carlos was not interested in it.
In 1787 Patrick Miller of Dalswinton invented a double-hulled boat, which was propelled on the Firth of Forth by men working a capstan which
drove paddles on each side.
The first paddle steamer was the Pyroscaphe built by Marquis Claude de Jouffroy of Lyon in France, in 1783. It had a horizontal double-acting steam engine driving two 13.1-ft (4 m) paddle wheels on the sides of the craft. On July 15 1783 it steamed successfully up the Saτne for fifteen minutes before the engine failed. Political events interrupted further development.
The next successful attempt at a paddle-driven steam ship was by the Scottish engineer William Symington who suggested steam power to Patrick Miller of Dalswinton. Experimental boats built in 1788 and 1789 worked successfully on Lochmaben Loch. In 1802, Symington built a barge-hauler, Charlotte Dundas, for the Forth and Clyde Canal Company. It successfully hauled two 70-ton barges almost 20 miles (30 km) in 6 hours against a strong headwind on test in 1802. There was much enthusiasm, but some directors of the company were concerned about the banks of the canal being damaged by the wash from a powered vessel, and no more were ordered.
While Charlotte Dundas was the first commercial paddle-steamer and steamboat, the first commercial success was possibly Robert Fulton's Clermont in New York, which went into commercial service in 1807 between New York City and Albany. Many other paddle-equipped river boats followed all around the world.
Seagoing paddle steamers
The first seagoing trip of a paddle steamer was that in 1808 of the Albany, which steamed from the Hudson River along the coast to the Delaware River. This was purely for the purpose of moving a river-boat to a new market, but the use of paddle-steamers for short coastal trips began soon after that.
The first paddle-steamer to make a long ocean voyage was the SS Savannah, built in 1819 expressly for this service. Savannah set out for Liverpool on May 22 1819, sighting Ireland after 23 days at sea. This was the first powered crossing of the Atlantic, although Savannah also carried a full rig of sail to assist the engines when winds were favorable. In 1822, Charles Napier's Aaron Manby, the world's first iron ship, made the first direct steam crossing from London to Paris and the first seagoing voyage by an iron ship anywhere.
In 1838, Sirius, a fairly small steam packet built for the Cork to London route, became the first vessel to cross the Atlantic under sustained steam power, beating Isambard Kingdom Brunel's much larger Great Western by a day. Great Western, however, was actually built for the transatlantic trade, and so had sufficient coal for the passage; Sirius had to burn furniture and other items after running out of coal. The Great Westerns more successful crossing began the regular sailing of powered vessels across the Atlantic. Beaver was the first coastal steamship to operate in the Pacific Northwest of North America. Paddle steamers helped open Japan to the Western World in the mid-19th century.
The largest paddle-steamer ever built was Brunel's Great Eastern, but it also had screw propulsion and sail rigging. It was 692 ft (211 m) long and weighed 32,000 tons, its paddle-wheels being 56 ft (17 m) in diameter.
In oceangoing service, paddle steamers became obsolete rather quickly with the invention of the screw propeller, but they remained in use in coastal service and as river tugboats, thanks to their shallow draught and good maneuverability.
Modern paddle steamers
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