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Azipod
Azipod is a trademarked azimuth thruster pod design, a marine propulsion unit consisting of a fixed pitch propeller mounted on a steerable gondola ("pod") containing the electric motor driving the propeller, allowing ships to be more maneuverable. They were developed in Finland in the late 1980s jointly by Wärtsilä Marine, Strömberg and the Finnish National Board of Navigation. Although "Azipod" is a registered trademark and brand name owned by ABB, it is sometimes used as a generic term for podded propulsion units manufactured by other companies. Concept In the conventional azimuth thrusters such as Z-drive and L-drive thrusters, the propeller is driven by an electric motor or a diesel engine inside the ship's hull. The propeller is coupled to the prime mover with shafts and bevel gears that allow rotating the propeller about a vertical axis. This type of propulsion system has a long tradition throughout the 1990s and today such propulsion units are produced by a n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Double Acting Ship
A double acting ship is a type of icebreaking ship designed to travel forwards in open water and thin ice, but turn around and proceed astern (backwards) in heavy ice conditions. In this way, the ship can operate independently in severe ice conditions without icebreaker assistance but retain better open water performance than traditional icebreaking vessels.Juurmaa, K et al.: The development of the new double acting ships for ice operation. Kvaerner Masa-Yards Arctic Technology2001 an2002. Double acting ships carrying liquid cargo are generally referred as double acting tankers. In the early 1990s Kværner Masa-Yards Arctic Technology Centre (MARC) developed the concept for oil transportation between the Russian Arctic and Europe and the first double acting tanker, Finnish crude oil tanker ''Tempera'', was delivered in 2002. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MT Varzuga
MT ''Varzuga'' () was an ice-strengthened product tanker that sailed under the Finnish flag in 1977–2003 and under the Russian flag in 2003–2021. After her modernization in 1993, she became the first merchant ship to be equipped with Azipod, an electric azimuthing propulsion unit developed in Finland in the late 1980s.Juurmaa, K et al.: The development of the double acting tanker for ice operation, Aker Arctic Technology Inc.2001 an2002. She was also the first non-Soviet ship to transit the Northern Sea Route. History Finland (1977–2003) ''Uikku'', built in 1977 by Werft Nobiskrug GmbH in Rendsburg, Germany, was the last ship of a series of four arctic product tankers ordered by a Finnish oil and petroleum products company Neste Oyj in the 1970s. The ships were given names after Finnish seabirds and the silhouettes of their namesake birds were painted on the side of the ships' superstructure. ''Lunni'' (Atlantic puffin) and ''Sotka'' (Aythya) were delivered in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MT Indiga
MT ''Indiga'' () was an ice-strengthened product tanker that sailed under the Finnish flag in 1976–2003 and under the Russian flag in 2003–2021. After her modernization in 1994 she became the second merchant ship, after her sister ship ''Varzuga'', to be equipped with an electric azimuth thruster called Azipod.Juurmaa, K et al.: The development of the double acting tanker for ice operation, Aker Arctic Technology Inc.2001 an2002. History ''Lunni'', built in 1976 by Werft Nobiskrug GmbH in Rendsburg, Germany, was the first ship of a series of four arctic product tankers ordered by a Finnish oil and petroleum products company Neste Oyj in the 1970s. The ships were given names after Finnish seabirds and the silhouettes of their namesake birds were painted on the side of the ships' superstructure. ''Lunni'' (Atlantic puffin) and ''Sotka'' (Aythya) were delivered in 1976 and ''Tiira'' (tern) and ''Uikku'' (grebe) in the following year. Until the 1990s the ships were used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Azimuth Thruster
An azimuth thruster is a configuration of marine propellers placed in pods that can be rotated to any horizontal angle (azimuth), making a rudder redundant. These give ships better maneuverability than a fixed propeller and rudder system. Types of azimuth thrusters There are two major variants, based on the location of the motor: # Mechanical transmission, which connects a motor inside the ship to the outboard unit by gearing. The motor may be diesel or diesel-electric. Depending on the shaft arrangement, mechanical azimuth thrusters are divided into L-drive and Z-drive. An L-drive thruster has a vertical input shaft and a horizontal output shaft with one right-angle gear. A Z-drive thruster has a horizontal input shaft, a vertical shaft in the rotating column and a horizontal output shaft, with two right-angle gears. # Electrical transmission, more commonly called pods, where an electric motor is fitted in the pod itself, connected directly to the propeller without ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carnival Elation
''Carnival Elation'' (formerly ''Elation'') is a operated by Carnival Cruise Line. Built by Kværner Masa-Yards at its Helsinki New Shipyard in Finland, she was floated out on January 4, 1998, and christened as ''Elation'' by Shari Arison Dorsman. Her inaugural cruise began March 20, 1998. During 2007, in common with all of her ''Fantasy''-class sisters, she had the prefix ''Carnival'' added to her name. Carnival Elation is currently sailing 4+5 day cruises to the Bahamas from Jacksonville. Layout ''Carnival Elation'' is a 71,909-ton ship and is 855 feet long. She features 11 passenger decks and can accommodate up to 2,190 guests along with 900 crew members. Despite being the smallest ship in the current Carnival fleet, ''Carnival Elation'' offers a wide array of activities and amenities. These include 12 lounges and bars, 3 swimming pools, 6 Jacuzzis, and 14 elevators. History ''Elation'' was the first cruise ship to be equipped with an Azipod propulsion system. The pods ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propeller
A propeller (often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon a working fluid such as water or air. Propellers are used to pump fluid through a pipe or duct, or to create thrust to propel a boat through water or an aircraft through air. The blades are shaped so that their rotational motion through the fluid causes a pressure difference between the two surfaces of the blade by Bernoulli's principle which exerts force on the fluid. Most marine propellers are screw propellers with helical blades rotating on a propeller shaft (ship), propeller shaft with an approximately horizontal axis. History Early developments The principle employed in using a screw propeller is derived from stern sculling. In sculling, a single blade is moved through an arc, from side to side taking care to keep presenting the blade to the wat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cycloconverter
A cycloconverter (CCV) or a cycloinverter converts a constant amplitude, constant frequency Alternating current, AC waveform to another AC waveform of a lower frequency by synthesizing the output waveform from segments of the AC supply without an intermediate DC link ( and ). There are two main types of CCVs, circulating current type and blocking mode type, most commercial high power products being of the blocking mode type. Characteristics Whereas phase-controlled semiconductor controlled rectifier devices (SCR) can be used throughout the range of CCVs, low cost, low-power TRIAC-based CCVs are inherently reserved for resistive load applications. The amplitude and frequency of converters' output voltage are both variable. The output to input frequency ratio of a three-phase CCV must be less than about one-third for circulating current mode CCVs or one-half for blocking mode CCVs.Bose (2006), p. 153 Output waveform quality improves as the ''pulse number'' of switching-device bridg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L-drive
An L-drive is a type of azimuth thruster where the electric motor is mounted vertically, removing the second bevel gear from the drivetrain. Azimuth thruster pods can be rotated through a full 360 degrees, allowing for rapid changes in thrust direction and eliminating the need for a conventional rudder A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, airship, or other vehicle that moves through a fluid medium (usually air or water). On an airplane, the rudder is used primarily to counter adverse yaw .... This form of power transmission is called a L-drive because the rotary motion has to make one right angle turn, thus looking a bit like the letter "L". This name is used to make clear the arrangement of drive is different from Z-drive. See also * * * * * Notes {{DEFAULTSORT:L-Drive Marine propulsion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hietalahti Shipyard
Hietalahti shipyard (also known as Helsinki New Shipyard, ) is a shipyard in Hietalahti, in downtown Helsinki, Finland. Since 2019, it has been operated by a company named Helsinki Shipyard. History The shipyard, first known as Helsingfors Skeppsdocka () and later as Sandvikens Skeppsdocka och Mekaniska Verkstad (), was founded in 1865 and delivered its first ship in 1868. It also constructed horse-drawn trams and railroad cars. Wärtsilä bought the parent company Kone ja Silta in the 1930s; it included also the Crichton-Vulcan shipyard in Turku. In 1965 the yard was renamed ''Wärtsilä Helsingin Telakka'' (Wärtsilä Helsinki Shipyard). After the bankruptcy of Wärtsilä Marine in 1989 the yards were operated by the newly formed Masa Yards, bought by the Norwegian Kværner group in the mid 1990s and known as Kvaerner Masa Yards. In 2005 the company merged with the Aker Finnyards shipyard in Rauma and was renamed Aker Yards in 2006. In 2008 Aker Yards was acquired b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Finnish National Board Of Navigation
Finnish may refer to: * Something or someone from, or related to Finland * Culture of Finland * Finnish people or Finns, the primary ethnic group in Finland * Finnish language, the national language of the Finnish people * Finnish cuisine See also * Finish (other) * Finland (other) * Suomi (other) Suomi means ''Finland'' in Finnish. Suomi may also refer to: *Finnish language Finnish (endonym: or ) is a Finnic languages, Finnic language of the Uralic languages, Uralic language family, spoken by the majority of the population in Finla ... * {{disambiguation Language and nationality disambiguation pages ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alternating Current
Alternating current (AC) is an electric current that periodically reverses direction and changes its magnitude continuously with time, in contrast to direct current (DC), which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions, Fan (machine), fans and electric lamps into a wall socket. The abbreviations ''AC'' and ''DC'' are often used to mean simply ''alternating'' and ''direct'', respectively, as when they modify ''Electric current, current'' or ''voltage''. The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa (the full period is called a ''wave cycle, cycle''). "Alternating current" most commonly refers to power distribution, but a wide range of other appl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mackinaw WLBB-30 Azipod Thruster
Mackinac or Mackinaw may refer to: Geography Landforms * Straits of Mackinac, a waterway in the U.S. state of Michigan connecting two of the Great Lakes, Lake Michigan and Lake Huron and separating the Upper and Lower Peninsulas of Michigan * Mackinac Island, an island in the Straits of Mackinac * Mackinaw River, a tributary of the Illinois River in the U.S. state of Illinois * Little Mackinaw River, a tributary of the Mackinaw River Populated areas * Mackinac County, Michigan * Mackinac Island, Michigan, the city on Mackinac Island * Mackinaw Township, Michigan, in Cheboygan County * Mackinaw City, Michigan, a village in Mackinaw Township * Mackinaw Township, Tazewell County, Illinois * Mackinaw, Illinois, a village in Mackinaw Township * Little Mackinaw Township, Tazewell County, Illinois * Mackinaw Historic District, a historic residential area in Franklin, Ohio Structures and places * Mackinac Bridge, a bridge over the Straits of Mackinac * Old Mackinac Point Lighthouse, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
