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Encyclopedia > Tugboat
A tugboat shown turning a large RORO cargo ship.
A tugboat shown turning a large RORO cargo ship.

A tugboat, or tug, is a boat used to maneuver, primarily by towing or pushing, other vessels (see shipping) in harbours, over the open sea or through rivers and canals. They are also used to tow barges, disabled ships, or other equipment like towboats. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Roll-on/roll-off is a method of transport (as a ferry, train, or airplane) that vehicles roll onto at the beginning and roll off of at the destination. ... For other uses, see Boat (disambiguation). ... Towing is the process of pulling or drawing behind a chain or line. ... // To push something is to move it by the application of force. ... Italian Full rigged ship Amerigo Vespucci in New York Harbor, 1976 A ship is a large watercraft capable of offshore navigation. ... Damaged package The Panama canal. ... A harbor (or harbour) or haven is a place where ships may shelter from the weather or are stored. ... For other uses, see River (disambiguation). ... For other uses, see Canal (disambiguation). ... Self propelled barge carrying bulk crushed stone A barge is a flat-bottomed boat, built mainly for river and canal transport of heavy goods. ... The towboat Angelina pushes a barge in New Orleans. ...

Contents

Tugboat design

Tugboats are quite strong for their size. Early tugboats had steam engines; today diesel engines are used. Tugboat engines typically produce 750 to 3000 horsepower (500 to 2000 kW), but larger boats (used in deep waters) can have power ratings up to 25 000 hp (20 000 kW). The engines are often the same as those used in railroad engines, but typically drive the propeller mechanically instead of converting the engine output to power electric motors, as is common for railroad engines. For safety, tugboats' engines feature two of each critical part for redundancy. // The term steam engine may also refer to an entire railroad steam locomotive. ... This article is about the fuel. ... This article is about a unit of measurement. ... This is the top-level page of WikiProject trains Rail tracks Rail transport refers to the land transport of passengers and goods along railways or railroads. ...


Tugboats are highly maneuverable and various propulsion systems have been developed to increase maneuverability and increase safety. The earliest tugs were fitted with paddle wheels but these were soon replaced by propeller-driven tugs. Kort nozzles have been added to increase thrust per kW / hp. This was followed by the nozzle-rudder which omitted the need for a conventional rudder. The cycloidal propeller was developed prior to World War II but was only occasionally used in tugs because of its manoeuvrability. After World War II it was also linked to safety due to the development of the Voith Water Tractor; a tugboat configuration which could not be pulled over by its tow. In the late 1950s the Z-drive or (azimuth thruster) were developed. Although sometimes referred to as the Schottel system many brands exist: Schottel, Z-Peller, Duckpeller, Thrustmaster, Ulstein, Wärtsilä etc. The propulsion system are used on tugboats designed for tasks such as ship docking and marine construction. Conventional propeller/rudder configurations are more efficient for port-to-port towing. Kort nozzle section The Kort nozzle is a shrouded, ducted propeller assembly for marine propulsion. ... The Voith-Schneider propeller is a specialized marine propulsion system. ... The Z-drive is a specialized form of marine propulsion. ... Siemens Schottel azimuth thrusters Azimuth thrusters are a method of propulsion for ships. ...


The Kort nozzle is a sturdy cylindrical structure around a special propeller having minimum clearance between the propeller blades and the inner wall of the Kort nozzle. The thrust:power ratio is enhanced because the water approaches the propeller in a linear configuration and exits the nozzle the same way. The Kort nozzle is named after its inventor, but many brands exist.


A new type of tugboat has been invented in the Netherlands. The so-called carousel tug consists of a design wherein the flexibility and effectiveness of the tugboat's maneuvers is determined not by the propulsion system, but by a steel construction on deck, consisting of two steel rings. The inner ring is fixed to the ship, and the second ring rotates freely and carries a hook or winch. The ship can therefore maneuver freely and independently of the towed ship, and since the towing point rotates towards the point nearest to the towed ship, the tug can capsize only with difficulty. One prototype exists presently, but the first new tugs are expected to sail in spring 2007.


Tugboats in fiction

To date there have been two childrens's shows revolving around anthropomorphic (living) tugboats. In the 1980s 13 episodes were made of TUGS. One of the creators of that series went on to make Theodore Tugboat. On Tugs the models were able to move their heads and eyes and didn't have motors. On Theodore Tugboat, the models have motors and moving eyes. Tugboats have also been featured on Thomas and Friends however they have been reused from Tugs and have no face nor a hat. Anthropomorphism, also referred to as personification or prosopopeia, is the attribution of human characteristics to inanimate objects, animals, forces of nature, and others. ... This article does not cite any references or sources. ... TV Show Reference Episode is the word usually used to refer to a part of a serial television or radio program. ... This article is about childrens television series. ... Theodore Tugboat is a television show for children about a little tugboat, his friends, and their adventures in the Big Harbor. ...


The spaceship Nostromo of the movie Alien could be considered a tug. The USCSS Ulysees Nostromo is a fictional starship, featured in the 1979 film Alien. ... This article discusses the film Alien; for other films/spin-offs see Alien (film series) Alien is a 1979 science fiction horror film directed by Ridley Scott. ...


Gallery

References

  • On Tugboats: Stories of Work and Life Aboard / Virginia Thorndike - Down East Books, 2004.
  • Under Tow: A Canadian History of Tugs and Towing / Donal Baird - Vanwell Publishing, 277 p., 2003 - ISBN 1551250764

External links

Wikimedia Commons has media related to:
Tugboat
Nautical Portal
  • Novatug Carrousel Tug

Some pictures of tugboats and tugboat building Image File history File links Commons-logo. ... Image File history File links No higher resolution available. ...

  • 18 m. Steel Tug Boat Dilovası pn dry dock and harbor
  • 25 m. Steel Tug Boat Dogancay on the sea
  • Huge propellers of 32 m. Steel Tug Boat Captain Emre Omur
  • Hull of 32 m. Tug Boat Sheba
  • You can find some more tugboat examples from here

  Results from FactBites:
 
Home (381 words)
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The tugboat knows its place, for the larger ship with which it has been entrusted is the focus.
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Tyler Tunes: Tribute to Tugboat (1861 words)
She had grown up with a cat and a goldfish and had been chased by a neighbor's dog when she was a kid.
So the odds of her and Tugboat hitting it off were a little slim at first.
Haven was working in Boston, Tugboat was staying with my family in Marblehead, I was living in Girona, and friends were renting my house in Colorado.
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