A paddle steamer is a steamship or riverboat powered by a steam engine that drives paddle wheels to propel the craft through the water. In antiquity, Paddle wheelers followed the development of poles, oars and sails, where the first uses were wheelers driven by animals or humans. Modern paddle wheelers may be powered by diesel engines.[a] Save for tourism and small pleasure boats (paddle boats), paddle propulsion is largely superseded by the screw propeller and other marine propulsion that have a higher efficiency, especially in rough or open water.
Paddle wheels 
The paddle wheel is a large steel framework wheel. The outer edge of the wheel is fitted with numerous, regularly-spaced paddle blades (called floats or buckets). The bottom quarter or so of the wheel travels underwater. An engine rotates the paddle wheel in the water to produce thrust, forward or backward as required. More advanced paddle wheel designs feature feathering methods that keep each paddle blade closer to vertical while in the water to increase 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; either a single wheel on the rear, known as a stern-wheeler, or a paddle wheel on each side, known as a side-wheeler.
Both sternwheelers and sidewheelers were used as riverboats in the United States. Some still operate for tourists, for example on the Mississippi River.
Side-wheelers are used as riverboats and as coastal craft. Though the side wheels and enclosing sponsons make them wider than stern-wheelers, they are more maneuverable, since they can usually move the paddles at different speeds, and even in opposite directions. This extra maneuverability makes side-wheelers popular on the narrower, winding rivers of the Murray-Darling system in Australia, where a number still operate.
European side-wheelers, such as the PS Waverley, connect the wheels with solid drive shafts that limit maneuverability and give the craft a wide turning radius. Some were built with paddle clutches that disengage one or both paddles so they can turn independently. However, early experience with side-wheelers required that they be operated with clutches out, or as solid shaft vessels. Crews noticed that as ships approached the dock, passengers moved to the side of the ship ready to disembark. The shift in weight, added to independent movements of the paddles, could lead to imbalance and potential capsizing. Paddle tugs were frequently operated with clutches in, as the lack of passengers aboard meant that independent paddle movement could be used safely and the added maneuverability exploited to the full.
Western world 
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 4th–5th century military treatise De Rebus Bellicis (chapter XVII), where the anonymous Roman author describes an ox-driven paddle-wheel warship:
|“||Animal power, directed by the resources on ingenuity, drives with ease and swiftness, wherever utility summons it, a warship suitable for naval combats, which, because of its enormous size, human frailty as it were prevented from being operated by the hands of men. In its hull, or hollow interior, oxen, yoked in pairs to capstans, turns wheels attached to the sides of the ship; paddles, projecting above the circumference or curved surface of the wheels, beating the water with their strokes like oar-blades as the wheels revolve, work with an amazing and ingenious effect, their action producing rapid motion. This warship, moreover, because of its own bulk and because of the machinery working inside it, joins battle with such pounding force that it easily wrecks and destroys all enemy warships coming at close quarters.||”|
One of the drawings of the Anonymous Author of the Hussite Wars shows a boat with a pair of paddle-wheels at each end turned by men operating compound cranks. The concept was improved by the Italian Roberto Valturio in 1463, who devised a boat with five sets, where the parallel cranks are all joined to a single power source by one connecting-rod, an idea adopted by his compatriot Francesco di Giorgio.
The very first functioning steamship, the Palmipède, which was also the first paddle steamer, was built in France in 1774 by Marquis Claude de Jouffroy and his colleagues. The 13-metre (42 ft 8 in) steamer with rotating paddles sailed on the Doubs River in June and July 1776. In 1783 a new paddle steamer by de Jouffroy, Pyroscaphe, successfully steamed up the river Saône for fifteen minutes before the engine failed. Bureaucracy and the French Revolution thwarted further progress by de Jouffroy.
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.
In 1812, the first U.S. Mississippi River paddle steamer began operating out of New Orleans. By 1814, Captain Henry Shreve[b] had developed a “steamboat” [c] suitable for local conditions. Landings in New Orleans went from 21 in 1814 to 191 in 1819, and over 1,200 in 1833.
After the American Civil War, as the expanding railroads took many passengers, the traffic became primarily bulk cargos. The largest, and one of the last, paddle steamers on the Mississippi was the sternwheeler Sprague. Built in 1901, she pushed coal and petroleum until 1948.  
East Asia 
||This section needs additional citations for verification. (August 2010)|
It is asserted 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 (420–479) used by admiral Wang Zhene in his campaign against the Qiang people in 418 AD. The mathematician and astronomer Zu Chongzhi (429–500) 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 (502–557) 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 (618–907) emperor. The Chinese Song Dynasty (960–1279) 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,”.
It is asserted 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 (1115–1234) navy. The Chinese used the paddle-wheel ship even during the First Opium War (1839–1842) and for transport around the Pearl River during the early 20th century.
Seagoing paddle steamers 
The first seagoing trip of a paddle steamer was by the Albany in 1808. It 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 paddle-steamers began regular short coastal trips soon after.
The first paddle-steamer to make a long ocean voyage was 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.
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 Western’s 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 much less useful after 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 
USA and Canada 
A few paddle steamers serve niche tourism needs as cruise boats on lakes[d] and others, such as the Delta Queen, still operate on the Mississippi River and in the Pacific Northwest along the Willamette River, as do a few in the United Kingdom and elsewhere in Europe.
PS Washington Irving, built in 1912 by the New York Shipbuilding Company, was the biggest passenger-carrying riverboat ever built with a capacity for 6,000 passengers. It was operated on the Hudson River from 1913 until it was sunk in an accident in 1926. One of the last paddle steamers built in the U.S. was the dredge William M. Black, built in 1934 and now a National Historic Landmark.
The Belle of Louisville is the oldest operating Mississippi River-style steamboat and was named a National Historic Landmark in 1989. Previously named the Idlewild and Avalon, the Belle is based in downtown Louisville, Kentucky.
The Elbe river Saxon Paddle Steamer Fleet in Dresden (known as "White Fleet"), Germany, is the oldest and biggest in the world, with around 700,000 passengers per year. The 1913-built Goethe was the last paddle steamer on the River Rhine. Previously the world's largest sidewheeler with a two-cylinder steam engine of 700 hp (520 kW), a length of 83 m and a height above water of 9.2 m, the Goethe was converted to Diesel-Hydraulic power during the winter of 2008/09.
Switzerland has a large paddle steamer fleet, most of the "Salon Steamer-type" built by Sulzer in Winterthur or Escher-Wyss in Zurich. There are five active and one inactive on Lake Lucerne, two on Lake Zurich, and one each on Lake Brienz, Lake Thun and Lake Constance. Swiss company CGN operates a number of paddle steamers on Lake Geneva. Their fleet includes three converted to diesel electric power in the 1960s and five retaining steam. One, Montreux, was reconverted in 2000 from diesel to an all-new steam engine. It is the world's first electronically remote-controlled steam engine and has operating costs similar to state-of-the-art diesels, while producing up to 90 percent less air pollution.
United Kingdom 
PS Waverley, built in 1947, is the last seagoing paddle steamer in the world. This ship sails a full season of cruises from ports around Britain, and sailed across the English Channel to commemorate the sinking of her predecessor of 1899 at the 1940 Battle of Dunkirk.
In the USSR, river paddle steamers of the type Iosif Stalin (project 373), later renamed Ryazan-class steamships, were built until 1951. Between 1952 and 1959, ships of this type were built for the Soviet Union by Obuda Hajogyar Budapest factory in Hungary. In total, 75 type Iosif Stalin/Ryazan side-wheelers were built. They are 70 m long and can carry up to 360 passengers. Few of them still remain in active service.
PS Adelaide is the oldest wooden-hulled paddle steamer in the world. Built in 1866, she operates from the Port of Echuca, on Australia's Murray River, which has the largest fleet of paddle steamers in the world.
PS Pevensey built 1911 in Moama and based in Echuca is still working as a tourist attraction on the Murray River. The Pevensey also starred as the fictional paddlesteamer Philadelphia in the TV series All the Rivers Run. 
PS Kookaburra Queen services the Brisbane River, operating as a floating restaurant or venue for hire.
PS Enterprise, built in Echuca in 1876-78 and now berthed at a wharf on the Acton Peninsula, Lake Burley Griffin, Canberra, has been restored to full working order. Recommissioned after restoration, she was used on the Murray River, the Darling River and the Murrumbidgee River in New South Wales between 1978 and 1988.
PS Marion, based at Mannum.
New Zealand 
The restored paddle steamer Waimarie is based in Wanganui, New Zealand. The Waimarie was built in kitset form in Poplar, London in 1899, and originally operated on the Whanganui River under the name Aotea. Later renamed, she remained in service until 1949. She sank at her moorings in 1952, and remained in the mud until raised by volunteers and restored to begin operations again in 2000.
The Netherlands 
The Kapitein Kok is a paddle steamer built in 1911 for ferry service on the river Lek. It has been fully restored in 1976 and is still in use today as a party ship. Queen Beatrix has chartered the ship in 1998 as part of the celebrations of her 60th birthday.
Paddle tugs 
The British Admiralty used diesel-electric paddle tugs in recent times. Each paddle wheel was driven by an individual electric motor, giving outstanding maneuverability. Paddle tugs were able to more easily make use of the inherent advantage of side wheel paddle propulsion, having the option to disconnect the clutches that connected the paddle drive shafts as one. This enabled them to turn one paddle ahead and one astern to turn and maneuver quickly.
See also 
- Delta Queen
- Experiment (horse powered boat)
- Personal paddlewheel boats
- Roller ship
- River cruise
- Technology of the Song Dynasty
- Category:Steamboat articles by route
- Experience of economics: The paddle designs using diesels are tourist vessels servicing sightseeing attractions or replica riverboats and are mainly restaurants and casinos.
- The namesake of Shreveport, Louisiana..
- Vessels operating on the Mississippi River system are referred to as “boats”.
- As a sampling: Steamers operate on Lake Champlain, Lake George, and Lake Winnipesaukee in the U.S. Northeast as of 2013.
- De Rebus Bellicis (anon.), chapter XVII, text edited by Robert Ireland, in: BAR International Series 63, part 2, p. 34
- Hall, Bert S. (1979). The Technological Illustrations of the So-Called "Anonymous of the Hussite Wars". Codex Latinus Monacensis 197, Part 1. Wiesbaden: Dr. Ludwig Reichert Verlag. p. 80. ISBN 3-920153-93-6.
- White, Jr., Lynn (1962). Medieval Technology and Social Change. Oxford: At the Clarendon Press. p. 114.
- White, Jr. (1962),p. 114">
- Smiles, Samuel (1884), Men of Invention and Industry, Gutenberg e-text
- Musée national de la Marine: Pyroscaphe. Bateau à vapeur Retrieved 2012-07-29
- Paine, Lincoln P (1997). Ships of the World. Houghton-Mifflin. pp. 182, 350, 357, 433–434, 487. ISBN 0-395-71556-3.
- "Steamboat navigation". Mississippi River Navigation. US Army Corps of Engineers Team New Orleans. Retrieved 25Feb2013.
- Ewen, William H (1988). Days of the Steamboats. Mystic Seaport Museum, Inc. pp. 27, 53, 70–71. ISBN 0-913372-47-1.
- Gandy, Joan W; Gandy, Thomas H (1987). The Mississippi Steamboat Era in Historic Photographs. Dover Publications, Inc. pp. 2–3, 116. ISBN 0-486-25260-4.
- "Sprague". Wheeling National Heritage Area Corp. Retrieved 25Feb2013.
- Needham, Joseph (1986). Science and Civilization in China: Volume 4, Part 3, Civil Engineering and Nautics. Taipei: Caves Books. p. 31.
- Needham, 476
- Needham, Joseph (1986). Science and Civilization in China: Volume 5, Part 7, Military Technology; The Gunpowder Epic. Taipei: Caves Books. p. 165-166.
- Men of Iron : Brunel, Stephenson and the Inventions That Shaped the Modern World by Sally Dugan ISBN 978-1-4050-3426-5
- Str. Portland
- Oregon Maritime Museum
- Sächsische Dampfschiffahrt
- RMS Goethe KD - Köln-Düsseldorfer Rheinschiffahrt
- German Wikipedia on the ship Goethe
- WALLER Roger: MODERN STEAM - AN ECONOMIC AND ENVIRONMENTAL ALTERNATIVE TO DIESEL TRACTION, Institution of Mechanical Engineers, The Sir Seymour Biscoe Tritton Lecture, Pages 9-10
- Russian river ships (in English)
- Russian passenger river fleet (in Russian)
- "Our Paddlesteamers - [[PS Pevensey]]". Echuca Paddlesteamers. Retrieved 2013-02-13. Wikilink embedded in URL title (help)
- "Our Paddlesteamers - [[PS Alexander Arbuthnot]]". Echuca Paddlesteamers. Retrieved 2013-02-13. Wikilink embedded in URL title (help)
- Whanganui River Boat Centre
- Clark, John and Wardle, David (2003). PS Enterprise. Canberra: National Museum of Australia.
- University of Wisconsin–La Crosse Historic Steamboat Photographs
- Dumpleton, Bernard, "The Story of the Paddle Steamer", Melksham, 2002.
|Wikimedia Commons has media related to: Paddle steamers|
- links to videos on paddle wheelers
- links to photos of a modern design on paddle wheelers
- PS Enterprise A restored 19th century paddle boat at the National Museum of Australia
- Australian paddle steamers A brief history
-  Forum Navis Romana: about the Rotaremis vehiculum (late-Roman paddle-wheel ship)