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CODAD
Combined diesel and diesel (CODAD) is a propulsion system for ships using two diesel engines to power a single propeller shaft. A gearbox and clutches enable either of the engines or both of them together to drive the shaft. Two advantages over simply using a single, larger diesel engine of the same total power output are that (1) diesel engines have somewhat better specific fuel consumption at 75% to 85% max output than they do at only 50% output, and (2) there is a weight and size advantage to using two higher-speed engines compared to a single lower-speed engine, even with the slightly larger gearbox system. CODAD vessels *Guaicamacuto-class patrol boat *Type 31 frigate *Steregushchiy-class corvette *Jose Rizal-class frigate * Frégates de taille intermédiaire *Type 054A Frigate * Doha-class corvette The Doha class (or ''Al Zubarah'' class) is a class of corvettes built by Fincantieri for the Qatari Emiri Navy. Development Fincantieri showcased for the first time ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type 31 Frigate
The Type 31 frigate or Inspiration class, and formerly known as the Type 31e frigate or General Purpose Frigate (GPF), is a planned class of frigate intended to enter service with the United Kingdom's Royal Navy in the 2020s alongside the submarine-hunting Type 26 frigate. Designed by Babcock International, it is also marketed under the name Arrowhead 140 and is based on the hull of the frigate. It is intended that the Type 31 frigate will replace some of the general-purpose Type 23 frigates. The Type 31 is part of the British government's "National Shipbuilding Strategy". Development The 2010 Strategic Defence and Security Review (SDSR) authorised the Global Combat Ship (GCS) programme which would replace the Royal Navy's thirteen Type 23 frigates. Earlier that year, BAE Systems was awarded a four-year, £127 million contract by the Ministry of Defence to design the new class. It was planned that two variants of the class would be built: five general purpose frigates and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guaicamacuto-class Patrol Boat
The ''Guaicamacuto''-class patrol boats (Avante 1400) is a class of offshore patrol vessels or BVL ( es, Buque de Vigilancia de Litoral) in Venezuelan Navy service for patrol duty in economic exclusive zone. A contract for four BVLs and four POVZEE was signed together on 25 November 2005. Since 2014 the Spanish Anticorruption Prosecutor's Office has been investigating the €42m "commission" paid to some of those involved. The final vessel of the class was to have been named after Tamanaco, a 16th-century tribal leader, but in 2013 GC-24 was renamed ''Comandante eterno Hugo Chávez'' after the death of the then president. GC-24 was laid down in 2008 under the supervision of Navantia at the Venezuelan National Dams and Shipyards (DIANCA) in Puerto Cabello, was launched in 2014 and began sea trials in April 2018, but Navantia pulled out of Venezuela in January 2019 before trials were complete. Ships of class '' Naiguatá (GC-23)'' sunk after ramming the cruise ship RCGS Resol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steregushchiy-class Corvette
The ''Steregushchiy'' class (russian: Стерегущий, , Guarding), Russian designation Project 20380, is a class of corvettes being built for the Russian Navy. Designed by the Almaz Central Marine Design Bureau, subsequent vessels were built to an improved design (Project 20381), incorporating the Zaslon-Redut SAM system. The ship full displacement and dimensions are large for a corvette, thus it is designated as a frigate by NATO. The ''Steregushchiy'' class has been further developed into the (Project 20385) and Project 20386 subclasses. The export variant is known as Project 20382 ''Tigr''. History The ships of the ''Steregushchiy'' class are multipurpose corvettes, designed to replace the . Such ships are used for littoral zone operations, engagement of enemy submarines and surface ships, and gun support of landing operations. The first batch built at the Severnaya Verf shipyard in St. Petersburg consists of four ships. A second building line has been started at Kom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jose Rizal-class Frigate
The ''Jose Rizal''-class of multi-role guided missile frigates, currently in service with the Philippine Navy, are a heavily modified variant of the ROK Navy's s. The ships, which were built by Hyundai Heavy Industries (HHI), are specifically accommodated to fit the requirements of the Philippine Navy. The frigates will improve the ability of the Philippine Navy's Offshore Combat Force, which is mostly composed of ships that were retired from other countries and subsequently transferred to the Philippines. Development First stage bid In May 2013, the Department of National Defense opened the "Frigate Acquisition Project", calling for the acquisition of two brand new frigates for the Philippine Navy with the contract price of Php 18 billion (around US$437 million as of May 2013). This is after rejecting the proposal to procure two s from Italy due to preference to acquire new ships. The tender was a two-stage bidding system, with proponents needing to pass the initial bid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type 054A Frigate
The Type 054A (NATO/ OSD Jiangkai II) is a class of guided-missile frigate from the People's Republic of China. It is a development of the Type 054 frigate; compared to its predecessor, the Type 054A has medium-range air defense capability in the form of Type 382 radar and vertically launched (VLS) HHQ-16 surface-to-air missiles.Schwartz (2015): page 28 The Type 054A entered service with the People's Liberation Army Navy (PLAN) in January 2008,''Jane's Fighting Ships'' (2015): page 144 and was a key component of the PLAN's surface fleet by the late 2010s.Willett (2019): page 24Willett (2019): page 26 Production was ongoing in 2021. Design The Type 054 was heavily influenced by the from France, and so reflected the strategic and operational requirements of that country. The development of the Type 054A may have been driven by China's need to address high-intensity armed conflict.Collins et al. (2014): page 2 The Type 054A uses the same stealthy hull form as the Type 054. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine Propulsion
Marine propulsion is the mechanism or system used to generate thrust to move a watercraft through water. While paddles and sails are still used on some smaller boats, most modern ships are propelled by mechanical systems consisting of an electric motor or internal combustion engine driving a propeller, or less frequently, in pump-jets, an impeller. Marine engineering is the discipline concerned with the engineering design process of marine propulsion systems. Human-powered paddles and oars, and later, sails were the first forms of marine propulsion. Rowed galleys, some equipped with sail, played an important early role in early human seafaring and warfares. The first advanced mechanical means of marine propulsion was the marine steam engine, introduced in the early 19th century. During the 20th century it was replaced by two-stroke or four-stroke diesel engines, outboard motors, and gas turbine engines on faster ships. Marine nuclear reactors, which appeared in the 1950s, pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ship
A ship is a large watercraft that travels the world's oceans and other sufficiently deep waterways, carrying cargo or passengers, or in support of specialized missions, such as defense, research, and fishing. Ships are generally distinguished from boats, based on size, shape, load capacity, and purpose. Ships have supported exploration, trade, warfare, migration, colonization, and science. After the 15th century, new crops that had come from and to the Americas via the European seafarers significantly contributed to world population growth. Ship transport is responsible for the largest portion of world commerce. The word ''ship'' has meant, depending on the era and the context, either just a large vessel or specifically a ship-rigged sailing ship with three or more masts, each of which is square-rigged. As of 2016, there were more than 49,000 merchant ships, totaling almost 1.8 billion dead weight tons. Of these 28% were oil tankers, 43% were bulk carriers, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diesel Engine
The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-called compression-ignition engine (CI engine). This contrasts with engines using spark plug-ignition of the air-fuel mixture, such as a petrol engine (gasoline engine) or a gas engine (using a gaseous fuel like natural gas or liquefied petroleum gas). Diesel engines work by compressing only air, or air plus residual combustion gases from the exhaust (known as exhaust gas recirculation (EGR)). Air is inducted into the chamber during the intake stroke, and compressed during the compression stroke. This increases the air temperature inside the cylinder to such a high degree that atomised diesel fuel injected into the combustion chamber ignites. With the fuel being injected into the air just before combustion, the dispersion of the fuel is une ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propeller Shaft
A drive shaft, driveshaft, driving shaft, tailshaft (Australian English), propeller shaft (prop shaft), or Cardan shaft (after Girolamo Cardano) is a component for transmitting mechanical power and torque and rotation, usually used to connect other components of a drivetrain that cannot be connected directly because of distance or the need to allow for relative movement between them. As torque carriers, drive shafts are subject to torsion and shear stress, equivalent to the difference between the input torque and the load. They must therefore be strong enough to bear the stress, while avoiding too much additional weight as that would in turn increase their inertia. To allow for variations in the alignment and distance between the driving and driven components, drive shafts frequently incorporate one or more universal joints, jaw couplings, or rag joints, and sometimes a splined joint or prismatic joint. History The term ''driveshaft'' first appeared during the mid-19th centu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transmission (mechanics)
Propulsion transmission is the mode of transmitting and controlling propulsion power of a machine. The term ''transmission'' properly refers to the whole drivetrain, including clutch, gearbox, prop shaft (for rear-wheel drive vehicles), differential, and final drive shafts. In the United States the term is sometimes used in casual speech to refer more specifically to the gearbox alone, and detailed usage differs. The transmission reduces the higher engine speed to the slower wheel speed, increasing torque in the process. Transmissions are also used on pedal bicycles, fixed machines, and where different rotational speeds and torques are adapted. Often, a transmission has multiple gear ratios (or simply "gears") with the ability to switch between them as the speed varies. This switching may be done manually (by the operator) or automatically (by a control unit). Directional (forward and reverse) control may also be provided. Single-ratio transmissions also exist, which simply cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clutch
A clutch is a mechanical device that engages and disengages power transmission, especially from a drive shaft to a driven shaft. In the simplest application, clutches connect and disconnect two rotating shafts (drive shafts or line shafts). In these devices, one shaft is typically attached to an engine or other power unit (the driving member), while the other shaft (the driven member) provides output power for work. Typically the motions involved are rotary, but linear clutches also exist. In a motor vehicle, the clutch acts as a mechanical linkage between the engine and transmission, and briefly disconnects, or separates the engine from the transmission system. This disconnects the drive wheels whenever the clutch pedal is depressed, allowing the driver to smoothly change gears. In a torque-controlled drill, for instance, one shaft is driven by a motor, and the other drives a drill chuck. The clutch connects the two shafts so they may be locked together and spin at the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
