1.
Imperial Japanese Navy
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The Imperial Japanese Navy was the navy of the Empire of Japan from 1868 until 1945, when it was dissolved following Japans defeat and surrender in World War II. The Japan Maritime Self-Defense Force was formed after the dissolution of the IJN, the Japanese Navy was the third largest navy in the world by 1920, behind the Royal Navy and the United States Navy. It was supported by the Imperial Japanese Navy Air Service for aircraft and it was the primary opponent of the Western Allies in the Pacific War. This eventually led to the Meiji Restoration, accompanying the re-ascendance of the Emperor came a period of frantic modernization and industrialization. Following the attempts at Mongol invasions of Japan by Kubilai Khan in 1274 and 1281, Japan undertook major naval building efforts in the 16th century, during the Warring States period, when feudal rulers vying for supremacy built vast coastal navies of several hundred ships. Around that time Japan may have developed one of the first ironclad warships when Oda Nobunaga, in 1588 Toyotomi Hideyoshi issued a ban on Wakō piracy, the pirates then became vassals of Hideyoshi, and comprised the naval force used in the Japanese invasion of Korea. Japan built her first large ocean-going warships in the beginning of the 17th century, from 1604 the Bakufu also commissioned about 350 Red seal ships, usually armed and incorporating some Western technologies, mainly for Southeast Asian trade. For more than 200 years, beginning in the 1640s, the Japanese policy of seclusion forbade contacts with the outside world and prohibited the construction of ocean-going ships on pain of death. Contacts were maintained, however, with the Dutch through the port of Nagasaki, the Chinese also through Nagasaki and the Ryukyus and Korea through intermediaries with Tsushima. Apart from Dutch trade ships no other Western vessels were allowed to enter Japanese ports, an exception was during the Napoleonic wars. However frictions with foreign ships started from the beginning of the 19th century, the Nagasaki Harbour Incident involving the HMS Phaeton in 1808 and other subsequent incidents in the following decades led to the Shogunate to enact an edict to repel foreign vessels. Western ships which were increasing their presence around Japan due to whaling, the shogunate also began to strengthen the nations coastal defenses. Numerous attempts to open Japan ended in failure in part to Japanese resistance, during 1853 and 1854, American warships under the command of Commodore Matthew Perry entered Edo Bay and made demonstrations of force requesting trade negotiations. After two hundred years of seclusion the 1854 Convention of Kanagawa led to the opening of Japan to international trade and this was soon followed by the 1858 Treaty of Amity and Commerce and treaties with other powers. In 1855, with Dutch assistance, the Shogunate acquired its first steam warship, Kankō Maru, samurai such as the future Admiral Enomoto Takeaki were sent by the Shogunate to study in the Netherlands for several years. In 1859 the Naval Training Center relocated to Tsukiji in Tokyo, in 1857 the Shogunate acquired its first screw-driven steam warship Kanrin Maru and used it as an escort for the 1860 Japanese delegation to the United States. In 1865 the French naval engineer Léonce Verny was hired to build Japans first modern naval arsenals, at Yokosuka, in 1867–1868 a British Naval mission headed by Commander Richard Tracey went to Japan to assist the development of the Japanese Navy and to organize the naval school of Tsukiji. The Shogunate also allowed and then ordered various domains to purchase warships and to develop naval fleets, Satsuma, a naval center had been set up by the Satsuma domain in Kagoshima, students were sent abroad for training and a number of ships were acquired
2.
Republic of China Navy
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The Republic of China Navy is the maritime branch of the Republic of China Armed Forces. Operations include maritime patrols in the Taiwan Strait and surrounding waters, as well as counter-strike, the Republic of China Marine Corps functions as a branch of the Navy. The ship prefix for ROCN combatants is ROCS, a usage is CNS. The Navy CHQs is subordinate to the General Staff, the Minister of Defense, internal units, Personnel, Combat Readiness & Training, Logistics, Planning, Combat Systems, General Affairs, Comptroller, Inspector General, Political Warfare. 7th Hai Feng Shore Based Anti-ship Missile Squadron, Haulien, Eastern Taiwan, Aviation Command Naval Aviation, at Pingtung, will receive 12 P-3C 2013/2014. 1st ASW Aviation Group 133rd Squadron, S-2T, at Pingtung, 2nd ASW Aviation Group 701st Helicopter Squadron, S-70C-1, at Hualien. 702nd Helicopter Squadron, S-70C-2, at Tsoying, 501st Helicopter Squadron, 500MD ASW, at Tsoying. Sources, The precursor to the modern ROC Navy was established as the Ministry of the Navy in the Provisional Government of the Republic of China in 1911 following the overthrow of the Qing dynasty. During the period of warlordism that scarred China in the 1920s and 1930s the ROCN remained loyal to the Kuomintang government of Sun Yat-sen instead of the government in Beijing. During that time and throughout World War II, the ROCN concentrated mainly on riverine warfare as the poorly equipped ROCN was not a match to Imperial Japanese Navy over ocean or coast. Following World War II, a number of Japanese destroyers and decommissioned U. S. ships were transferred to the ROC Navy. During the Chinese Civil War, the ROCN was involved in the protection of supply convoys, the subsequent reorganization and reestablishment of the Navy after evacuation to Taiwan is referenced in the lyrics of the post 1949 ROC Navy Song The New Navy. Since the 1990s the Navy has grown in importance as the emphasis of the ROCs military doctrine moves towards countering a possible Peoples Republic of China blockade, as well as offshore engagement. The ROCN has been working hard to expand its capability in electronic and anti-submarine warfare, however local shipbuilder CSBC still lacks the technology to build modern submarines. Traditionally, most ROCN equipment is purchased from the United States, the ROCN has also purchased Lafayette-class frigates from France and Zwaardvis-class submarines from the Netherlands as well as four U. S. Kidd-class destroyers originally intended for Iran. Despite the ROCN refurbishing and extending the life of its vessels and equipment. It has only two useful submarines, the U. S. Furthermore, the Legislative Yuan did not approve the budget and thereby slowed the opportunity to procure the badly needed underwater defense capability. A contract was awarded to Lockheed Martin to refurbish the 12 P-3C Orion aircraft for the ROC on 13 March 2009, in 2008, the ROCN set out to acquire an improved anti-ship capability
3.
People's Liberation Army Navy
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The PLAN can trace its lineage to naval units fighting during the Chinese Civil War and was established in September 1950. Throughout the 1950s and early 1960s the Soviet Union provided assistance to the PLAN in the form of advisers and export of equipment. Until the late 1980s, the PLAN was largely a riverine and this led to the development of the Peoples Liberation Army Navy into a green-water navy by 2009. Before the 1990s the PLAN had traditionally played a role to the Peoples Liberation Army Ground Force. In 2008, General Qian Lihua confirmed that China plans to operate a fleet of aircraft carriers in the near future. As of 2013 PLA officials have also outlined plans to operate in the first, Chinese strategists term the development of the PLAN from a green-water navy into a regional blue-water defensive and offensive navy. The PLAN traces its lineage to units of the Republic of China Navy who defected to the Peoples Liberation Army towards the end of the Chinese Civil War, in 1949, Mao Zedong asserted that to oppose imperialist aggression, we must build a powerful navy. During the Landing Operation on Hainan Island, the used wooden junks fitted with mountain guns as both transport and warships against the Republic of China Navy. The Naval Academy was set up at Dalian on 22 November 1949, the navy was established in September 1950 by consolidating regional naval forces under Joint Staff Department command in Jiangyan, now in Taizhou, Jiangsu province. It then consisted of a collection of ships and boats acquired from the Kuomintang forces. The Naval Air Force was added two years later, by 1954 an estimated 2,500 Soviet naval advisers were in China—possibly one adviser to every thirty Chinese naval personnel—and the Soviet Union began providing modern ships. In shipbuilding the Soviets first assisted the Chinese, then the Chinese copied Soviet designs without assistance, eventually Soviet assistance progressed to the point that a joint Sino-Soviet Pacific Ocean fleet was under discussion. Through the upheavals of the late 1950s and 1960s the Navy remained relatively undisturbed, under the leadership of Minister of National Defense Lin Biao, large investments were made in naval construction during the frugal years immediately after the Great Leap Forward. In the 1970s, when approximately 20 percent of the budget was allocated to naval forces. The Navy also began development of attack submarines and nuclear-powered ballistic missile submarines. In the 1980s, under the leadership of Chief Naval Commander Liu Huaqing, Liu Huaqing was an Army Officer who spent most of his career in administrative positions involving science and technology. It was not until 1988 that the Peoples Liberation Army Navy was led by a Naval Officer, Liu was also very close to Deng Xiaoping as his modernization efforts were very much in keeping with Dengs national policies. While under his leadership Naval construction yards produced fewer ships than the 1970s, greater emphasis was placed on technology, in 1982 the navy conducted a successful test of an underwater-launched ballistic missile
4.
Type 96 25 mm AT/AA Gun
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The Type 96 25mm Gun was an automatic cannon used by the Imperial Japanese Navy during World War II. In 1935 the Imperial Japanese Navy decided to replace the earlier 40 mm Vickers pom-pom guns with a 25 mm Hotchkiss design. A party of Japanese officers and engineers traveled to France to evaluate the design in 1935, firing tests of these guns were conducted at Yokosuka Naval Arsenal in 1935. The first few weapons were built in France under the designation “Type 94” and “Type 95”, a submarine-mountable version of the gun was also produced, which made extensive use of stainless steel. The double mount type was the first to service, with triple mounts following in 1941. The Type 96 25mm Gun is a simple air-cooled gas operated design, the barrel is a forging screwed into the breech mechanism. Additional support is provided to the end of the gun barrel by the finned cooling jacket. The barrel is changeable, but the required two men and special tools to complete, and took a trained crew approximately five minutes. By adjusting the gas valve setting it was possible to vary the rate of fire between 200 and 260 rounds per minute, with 220 rounds per minute being the standard setting. The Type 95 sight was used on ship-based multiple mounts, in the case where the mount has a powered drive linked to a director it was used as a backup. The Type 95 sight was designed with a maximum target speed of 600 kilometers per hour, however. To compensate for the problem a ring was added to the telescope to provide an additional offset for the speeds up to 900 kilometers per hour. The gun was used without a gun shield, although some multiple mounts on Yamato-class battleships were fitted with Ducol shields. Many ship based mounts also had splinter shields, in interviews conducted by the U. S. The Type 96 was most effective when used at ranges of 1,000 meters or less, according to US Naval Technical Mission to Japan report O-47-2, all magazines had to be loaded by hand as no specialized loading equipment was ever developed. Overall, it was comparable to the 20mm Oerlikon, though vastly inferior to the 40mm Bofors weapons used by the US in every respect except rate of fire. The single mount was free swinging, while double and triple mounts had hand-wheel traverse, Type 96 Model 2 - Used on warships in double and triple mountings. Type 96 Model 3 - Used on warships in single free-swinging mounts, Type 96 Model 4 - Used on submarines, in single, double and triple mounts
5.
Depth charge
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A depth charge is an anti-submarine warfare weapon. It is intended to destroy a submarine by being dropped into the nearby and detonating, subjecting the target to a powerful. Most depth charges use high explosive charges and a set to detonate the charge. Depth charges can be dropped by ships, patrol aircraft, Depth charges were developed during World War I, and were one of the first effective methods of attacking a submarine underwater. They were widely used in World War I and World War II and they remained part of the anti-submarine arsenals of many navies during the Cold War. Depth charges have now largely replaced by anti-submarine homing torpedoes. A depth charge fitted with a warhead is known as a nuclear depth bomb. These were designed to be dropped from a plane or deployed by an anti-submarine missile from a surface ship, or another submarine. All nuclear anti-submarine weapons were withdrawn from service by the United States, the United Kingdom, France, Russia and they were replaced by conventional weapons whose accuracy and range had improved greatly as ASW technology improved. The first attempt to fire charges against submerged targets was with aircraft bombs attached to lanyards which triggered them, a similar idea was a 16 lb guncotton charge in a lanyarded can. Two of these together became known as the depth charge Type A. Problems with the lanyards tangling and failing to function led to the development of a chemical pellet trigger as the Type B and these were effective at a distance of around 20 ft. A1913 Royal Navy Torpedo School report described a device intended for countermining, at Admiral John Jellicoes request, the standard Mark II mine was fitted with a hydrostatic pistol preset for 45 ft firing, to be launched from a stern platform. Weighing 1,150 lb, and effective at 100 ft, the design work was carried out by Herbert Taylor at the RN Torpedo and Mine School, HMS Vernon. The first effective depth charge, the Type D, became available in January 1916 and it was a barrel-like casing containing a high explosive. There were initially two sizes—Type D, with a 300 lb charge for fast ships, and Type D* with a 120 lb charge for ships too slow to leave the area before the more powerful charge detonated. A hydrostatic pistol actuated by water pressure at a pre-selected depth detonated the charge, initial depth settings were 40 or 80 ft. Because production could not keep up with demand, anti-submarine vessels initially carried two depth charges, to be released from a chute at the stern of the ship
6.
Anti-submarine warfare
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Anti-submarine warfare is a branch of underwater warfare that uses surface warships, aircraft, or other submarines to find, track and deter, damage or destroy enemy submarines. Successful anti-submarine warfare depends on a mix of sensor and weapon technology, training, sophisticated sonar equipment for first detecting, then classifying, locating and tracking the target submarine is a key element of ASW. To destroy submarines both the torpedo and mine are used, launched from air, surface and underwater platforms, other means of destruction have been used in the past but are now obsolete. ASW also involves protecting friendly ships, the first self-propelled torpedo was invented in 1863 and launched from surface craft. The first submarine with a torpedo was Nordenfelt I built in 1884-1885, in the Russo-Japanese War of 1904-5, the submarine was a significant threat. By the start of the First World War nearly 300 submarines were in service, some warships were fitted with an armoured belt as protection against torpedoes. There were, however, no means to detect submerged U-boats, the Royal Navy torpedo establishment, HMS Vernon, studied explosive grapnel sweeps, these sank four or five U-boats in the First World War. A similar approach featured a string of 70 lb charges on a cable, fired electrically. Also tried were dropping 18.5 lb hand-thrown guncotton bombs, the Lance Bomb was developed, also, this featured a 35–40 lb cone-shaped steel drum on a 5 ft shaft, intended to be thrown at a submarine. Firing Lyddite shells, or using trench mortars, was tried, use of nets to ensnare U-boats was also examined, as was a destroyer, HMS Starfish, fitted with a spar torpedo. Problems with the lanyards tangling and failing to function led to the development of a chemical pellet trigger as the Type B and these were effective at a distance of around 20 ft. The best concept arose in a 1913 RN Torpedo School report, describing a device intended for countermining, at Admiral John Jellicoes request, the standard Mark II mine was fitted with a hydrostatic pistol preset for 45 ft firing, to be launched from a stern platform. Weighing 1,150 lb, and effective at 100 ft, the mine was a potential hazard to the dropping ship. During the First World War, submarines were a major menace and they operated in the Baltic, North Sea, Black Sea and Mediterranean as well as the North Atlantic. Previously they had limited to relatively calm and protected waters. The vessels used to them were a range of small, fast surface ships using guns. They mainly relied on the fact a submarine of the day was often on the surface for a range of reasons, the first approach to protect warships was chainlink nets strung from the sides of battleships, as defense against torpedoes. Nets were also deployed across the mouth of a harbour or naval base to stop submarines entering or to stop torpedoes of the Whitehead type fired against ships, British warships were fitted with a ram with which to sink submarines, and U-15 was thus sunk in August 1914
7.
Displacement (ship)
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The displacement or displacement tonnage of a ship is the ships weight. The name reflects the fact that it is measured indirectly, by first calculating the volume of water displaced by the ship, by Archimedes principle, this is also the weight of the ship. Displacement should not be confused with other measurements of volume or capacity typically used for vessels such as net tonnage, gross tonnage. The process of determining a vessels displacement begins with measuring its draft This is accomplished by means of its draft marks, a merchant vessel has three matching sets, one mark each on the port and starboard sides forward, midships, and astern. These marks allow a ships displacement to be determined to an accuracy of 0. 5%, the draft observed at each set of marks is averaged to find a mean draft. The ships hydrostatic tables show the corresponding volume displaced, to calculate the weight of the displaced water, it is necessary to know its density. Seawater is more dense than water, so a ship will ride higher in salt water than in fresh. The density of water varies with temperature. Devices akin to slide rules have been available since the 1950s to aid in these calculations and it is done today with computers. Displacement is usually measured in units of tonnes or long tons and these bring the ship down to its load draft, colloquially known as the waterline. Full load displacement and loaded displacement have almost identical definitions, full load is defined as the displacement of a vessel when floating at its greatest allowable draft as established by classification societies. Warships have arbitrary full load condition established, deep load condition means full ammunition and stores, with most available fuel capacity used. Light displacement is defined as the weight of the ship excluding cargo, fuel, water, ballast, stores, passengers, crew, normal displacement is the ships displacement with all outfit, and two-thirds supply of stores, ammunition, etc. on board. Standard displacement, also known as Washington displacement, is a term defined by the Washington Naval Treaty of 1922. Naval architecture Hull Hydrodynamics Tonnage Dear, I. C. B, oxford Companion to Ships and the Sea. George, William E. Stability & Trim for the Ships Officer, turpin, Edward A. McEwen, William A. Trim and Stability Information for Drydocking Calculations, conference on the Limitation of Armament,1922. Papers Relating to the Foreign Relations of the United States,1922, proceedings of the United States Naval Institute
8.
Diesel engine
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Diesel engines work by compressing only the air. This increases the air temperature inside the cylinder to such a degree that it ignites atomised diesel fuel that is injected into the combustion chamber. This contrasts with spark-ignition engines such as an engine or gas engine. In diesel engines, glow plugs may be used to aid starting in cold weather, or when the engine uses a lower compression-ratio, the original diesel engine operates on the constant pressure cycle of gradual combustion and produces no audible knock. Low-speed diesel engines can have an efficiency that exceeds 50%. Diesel engines may be designed as either two-stroke or four-stroke cycles and they were originally used as a more efficient replacement for stationary steam engines. Since the 1910s they have used in submarines and ships. Use in locomotives, trucks, heavy equipment and electricity generation plants followed later, in the 1930s, they slowly began to be used in a few automobiles. Since the 1970s, the use of engines in larger on-road and off-road vehicles in the US increased. According to the British Society of Motor Manufacturing and Traders, the EU average for diesel cars accounts for 50% of the total sold, including 70% in France and 38% in the UK. The worlds largest diesel engine is currently a Wärtsilä-Sulzer RTA96-C Common Rail marine diesel, the definition of a Diesel engine to many has become an engine that uses compression ignition. To some it may be an engine that uses heavy fuel oil, to others an engine that does not use spark ignition. However the original cycle proposed by Rudolf Diesel in 1892 was a constant temperature cycle which would require higher compression than what is needed for compression ignition. Diesels idea was to compress the air so tightly that the temperature of the air would exceed that of combustion, to make this more clear, let it be assumed that the subsequent combustion shall take place at a temperature of 700°. Then in that case the pressure must be sixty-four atmospheres, or for 800° centigrade the pressure must be ninety atmospheres. In later years Diesel realized his original cycle would not work, Diesel describes the cycle in his 1895 patent application. Notice that there is no longer a mention of compression temperatures exceeding the temperature of combustion, now all that is mentioned is the compression must be high enough for ignition. In 1806 Claude and Nicéphore Niépce developed the first known internal combustion engine, the Pyréolophore fuel system used a blast of air provided by a bellows to atomize Lycopodium
9.
Drive shaft
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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 enough to bear the stress, whilst avoiding too much additional weight as that would in turn increase their inertia. The term drive shaft first appeared during the mid 19th century, in Stovers 1861 patent reissue for a planing and matching machine, the term is used to refer to the belt-driven shaft by which the machine is driven. The term is not used in his original patent, another early use of the term occurs in the 1861 patent reissue for the Watkins and Bryson horse-drawn mowing machine. Here, the term refers to the transmitting power from the machines wheels to the gear train that works the cutting mechanism. In the 1890s, the term began to be used in a closer to the modern sense. In 1899, Bukey used the term to describe the shaft transmitting power from the wheel to the machinery by a universal joint in his Horse-Power. In the same year, Clark described his Marine Velocipede using the term to refer to the shaft transmitting power through a universal joint to the propeller shaft. Crompton used the term to refer to the shaft between the transmission of his steam-powered Motor Vehicle of 1903 and the driven axle, an automobile may use a longitudinal shaft to deliver power from an engine/transmission to the other end of the vehicle before it goes to the wheels. A pair of short drive shafts is commonly used to power from a central differential, transmission. In front-engined, rear-drive vehicles, a drive shaft is also required to send power the length of the vehicle. Two forms dominate, The torque tube with a universal joint. This system became known as Système Panhard after the automobile company Panhard et Levassor patented it, most of these vehicles have a clutch and gearbox mounted directly on the engine, with a drive shaft leading to a final drive in the rear axle. When the vehicle is stationary, the drive shaft does not rotate, some vehicles, seeking improved weight balance between front and rear, use a rear-mounted transaxle. This places the clutch and transmission at the rear of the car, in this case the drive shaft rotates continuously with the engine, even when the car is stationary and out of gear. A drive shaft connecting a rear differential to a wheel may be called a half-shaft. The name derives from the fact that two such shafts are required to one rear axle. Early automobiles often used chain drive or belt drive mechanisms rather than a drive shaft, some used electrical generators and motors to transmit power to the wheels
10.
Ministry of the Navy (Japan)
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The Navy Ministry of Japan was a cabinet-level ministry in the Empire of Japan charged with the administrative affairs of the Imperial Japanese Navy. It existed from 1872 to 1945, the Navy Ministry was created in April 1872, along with the Army Ministry, to replace the Ministry of the Military of the early Meiji government. Initially, the Navy Ministry was in charge of administration and operational command of the Imperial Japanese Navy. However, with the creation of the Imperial Japanese Navy General Staff in May 1893, the ministry was responsible for the naval budget, ship construction, weapons procurement, personnel, relations with the Diet and the cabinet and broad matters of naval policy. The General Staff directed the operations of the fleet and the preparation of war plans, the post of Navy Minister was politically powerful. Although a member of the Cabinet after the establishment of the system of government in 1885. Up until the 1920s, the Navy Ministry held the hand over the Navy General Staff in terms of political influence. However, the officers of the Navy General Staff found an opportunity at the Washington Naval Conference in 1921–22 to improve their situation. At this meeting, the United States and Britain wanted to establish a worldwide naval ratio, the Naval Ministry was willing to agree to this, seeking to maintain the Anglo-Japanese Alliance, but the Navy General Staff refused. The Imperial Japanese Navy became divided into mutually hostile Fleet Faction, ultimately, the treaty was signed by Japan, but terminated in 1934. After 1937, both the Navy Minister and the Chief of the Navy General Staff were members of the Imperial General Headquarters, katsu Kaishū Kawamura Sumiyoshi Enomoto Takeaki Nakamuta Kuranosuke Kabayama Sukenori Asada, Sadao. From Mahan to Pearl Harbor, The Imperial Japanese Navy and the United States, making Waves, Politics, Propaganda, And The Emergence Of The Imperial Japanese Navy, 1868–1922. Foreign Office Files for Japan and the Far East
11.
Aircraft carrier
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An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and facilities for carrying, arming, deploying, and recovering aircraft. Typically, it is the ship of a fleet, as it allows a naval force to project air power worldwide without depending on local bases for staging aircraft operations. Aircraft carriers are expensive to build and are critical assets, there is no single definition of an aircraft carrier, and modern navies use several variants of the type. These variants are sometimes categorized as sub-types of aircraft carriers, Aircraft carriers may be classified according to the type of aircraft they carry and their operational assignments. Admiral Sir Mark Stanhope, former head of the Royal Navy, has said, To put it simply, as of April 2017, there are 37 active aircraft carriers in the world within twelve navies. The United States Navy has 10 large nuclear-powered fleet carriers, the largest carriers in the world, the Royal Navy of Great Britain is building two 280-m / 920-ft carriers, the Queen Elizabeth, and the Prince of Wales scheduled to go into service in 2020-2023. These are the largest carriers capable of fast speeds, by comparison, escort carriers were developed to provide defense for convoys of ships. They were smaller and slower with lower numbers of aircraft carried, most were built from mercantile hulls or, in the case of merchant aircraft carriers, were bulk cargo ships with a flight deck added on top. Light aircraft carriers were fast enough to operate with the main fleet, three nations currently operate carriers of this type, ten by the United States, and one each by France and Brazil for a total of twelve in service. Short take-off but arrested-recovery, these carriers are generally limited to carrying lighter fixed-wing aircraft with more limited payloads, currently, Russia, China, and India possess commissioned carriers of this type. Short take-off vertical-landing, limited to carrying STOVL aircraft and this type of aircraft carrier is currently in service with Italy. Some also count the nine US amphibious assault ships in their secondary light carrier role boosting the total to thirteen. Helicopter carrier, Helicopter carriers have an appearance to other aircraft carriers. Some are designed for addition of, or may include, a ski jump ramp allowing for STOVL operations or may have a ski jump installed before retirement of STOVL aircraft. In the past, some conventional carriers were converted and called commando carriers by the Royal Navy, some helicopter carriers with a resistant flight surface can operate STOVL jets. Currently the majority of carriers, but not all, are classified as amphibious assault ships. The US has nine of this type, France and Japan three, Australia two, the UK one, the Republic of Korea one and Spain one, the US and Spains amphibious assault ships operate STOVL jets in normal deployment. Supercarrier Fleet carrier Light aircraft carrier Escort carrier Several systems of identification symbol for aircraft carriers, two months later, on 18 January 1911, Ely landed his Curtiss pusher airplane on a platform on the armored cruiser USS Pennsylvania anchored in San Francisco Bay
12.
Japanese aircraft carrier Akagi
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Akagi was an aircraft carrier built for the Imperial Japanese Navy, named after Mount Akagi in present-day Gunma Prefecture. Though she was laid down as an Amagi-class battlecruiser, Akagi was converted to a carrier while still under construction to comply with the terms of the Washington Naval Treaty. The ship was rebuilt from 1935 to 1938 with her original three flight decks consolidated into an enlarged flight deck and an island superstructure. This doctrine enabled Japan to attain its goals during the early stages of the Pacific War from December 1941 until mid-1942. Akagis aircraft served in the Second Sino-Japanese War in the late 1930s, upon the formation of the First Air Fleet or Kido Butai in early 1941, she became its flagship, and remained so for the duration of her service. With other fleet carriers, she took part in the Attack on Pearl Harbor in December 1941, the following month, her aircraft bombed Darwin, Australia, and assisted in the conquest of the Dutch East Indies. In March and April 1942, Akagis aircraft helped sink a British heavy cruiser, after a brief refit, Akagi and three other fleet carriers of the Kido Butai participated in the Battle of Midway in June 1942. After bombarding American forces on the atoll, Akagi and the carriers were attacked by aircraft from Midway and the carriers Enterprise, Hornet. Dive bombers from Enterprise severely damaged Akagi, when it became obvious she could not be saved, she was scuttled by Japanese destroyers to prevent her from falling into enemy hands. The loss of Akagi and three other IJN carriers at Midway was a strategic defeat for Japan and contributed significantly to the Allies ultimate victory in the Pacific. Akagi was laid down as an Amagi-class battlecruiser at Kure, Japan, the ship was named after Mount Akagi, following the Japanese ship-naming conventions for battlecruisers. Construction was halted, however, when Japan signed the Washington Naval Treaty on 6 February 1922, the IJN had decided, following the launch of its first aircraft carrier, Hōshō, to construct two larger, faster carriers for operations with major fleet units. The incomplete hulls of Amagi and Akagi were thus selected for completion as the two large carriers under the 1924 fleet construction program, ¥24.7 million was originally budgeted to complete Akagi as a battlecruiser and an estimated ¥8 million had been expended when construction stopped in February 1922. Shortly thereafter, the Diet approved an additional ¥90 million to complete Akagi and Amagi as carriers, construction of Akagi as an aircraft carrier began on 19 November 1923. Amagis hull was damaged beyond economically feasible repair in the Great Kantō earthquake of 1 September 1923 and was broken up and scrapped. Akagi, the remaining member of her class, was launched as a carrier on 22 April 1925 and commissioned at Kure Naval Arsenal on 25 March 1927. She was the carrier to enter service with the IJN, after Hōshō. Since Akagi was initially conceived as a battlecruiser, the prevailing ship naming conventions dictated that she be named after a mountain, Akagi came from Mount Akagi, a dormant volcano in the Kantō region
