Yamato-class battleship
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The were two battleships of the
Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, when it was dissolved following Japan's surrend ...
(IJN), and , laid down leading up to World War II and completed as designed. A third hull laid down in 1940 was converted to an aircraft carrier, , during construction. Displacing nearly at full load, the completed battleships were the heaviest ever constructed. The class carried the largest
naval artillery Naval artillery is artillery mounted on a warship, originally used only for naval warfare and then subsequently used for shore bombardment and anti-aircraft roles. The term generally refers to tube-launched projectile-firing weapons and exclude ...
ever fitted to a warship, nine 460-mm (18.1 in) naval guns, each capable of firing shells over . Due to the threat of U.S. submarines and aircraft carriers, both ''Yamato'' and ''Musashi'' spent the majority of their careers in naval bases at
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, Truk, and
Kure is a port and major shipbuilding city situated on the Seto Inland Sea in Hiroshima Prefecture, Japan. With a strong industrial and naval heritage, Kure hosts the second-oldest naval dockyard in Japan and remains an important base for the Japan ...
—deploying on several occasions in response to U.S. raids on Japanese bases. All three ships were sunk by the
U.S. Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage o ...
; ''Musashi'' while participating in the Battle of Leyte Gulf in October 1944, the ''Shinano'' while under way from
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to
Kure is a port and major shipbuilding city situated on the Seto Inland Sea in Hiroshima Prefecture, Japan. With a strong industrial and naval heritage, Kure hosts the second-oldest naval dockyard in Japan and remains an important base for the Japan ...
for fitting out in November 1944, and the ''Yamato'' while en route from Japan to
Okinawa is a prefecture of Japan. Okinawa Prefecture is the southernmost and westernmost prefecture of Japan, has a population of 1,457,162 (as of 2 February 2020) and a geographic area of 2,281 km2 (880 sq mi). Naha is the capital and largest city ...
as part of
Operation Ten-Go , also known as Operation Heaven One (or Ten-ichi-gō 天一号), was the last major Japanese naval operation in the Pacific Theater of World War II. The resulting engagement is also known as the Battle of the East China Sea. In April 1945, t ...
in April 1945.


Background

The design of the ''Yamato''-class battleships was shaped by expansionist movements within the Japanese government, Japanese industrial power, and the need for a fleet powerful enough to intimidate likely adversaries. Most importantly, the latter, in the form of the Kantai Kessen (“Decisive Battle Doctrine”), a naval strategy adopted by the
Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, when it was dissolved following Japan's surrend ...
prior to the
Second World War World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposi ...
, in which the Japanese navy would win a war by fighting and winning a single, decisive naval action. After the end of the First World War, many navies—including those of the United States, the United Kingdom, and Imperial Japan—continued and expanded construction programs that had begun during the conflict. The enormous costs associated with these programs pressured their government leaders to begin a disarmament conference. On 8 July 1921, the United States' Secretary of State
Charles Evans Hughes Charles Evans Hughes Sr. (April 11, 1862 – August 27, 1948) was an American statesman, politician and jurist who served as the 11th Chief Justice of the United States from 1930 to 1941. A member of the Republican Party, he previously was the ...
invited delegations from the other major maritime powers—France, Italy, Japan, and the United Kingdom—to come to Washington, D.C. and discuss a possible end to the naval arms race. The subsequent
Washington Naval Conference The Washington Naval Conference was a disarmament conference called by the United States and held in Washington, DC from November 12, 1921 to February 6, 1922. It was conducted outside the auspices of the League of Nations. It was attended by nine ...
resulted in the
Washington Naval Treaty The Washington Naval Treaty, also known as the Five-Power Treaty, was a treaty signed during 1922 among the major Allies of World War I, which agreed to prevent an arms race by limiting naval construction. It was negotiated at the Washington Nav ...
. Along with many other provisions, it limited all future battleships to a
standard displacement The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into wei ...
of and a maximum gun caliber of . It also agreed that the five countries would not construct more capital ships for ten years and would not replace any ship that survived the treaty until it was at least twenty years old. In the 1930s, the Japanese government began a shift towards
ultranationalist Ultranationalism or extreme nationalism is an extreme form of nationalism in which a country asserts or maintains detrimental hegemony, supremacy, or other forms of control over other nations (usually through violent coercion) to pursue its sp ...
militancy. This movement called for the expansion of the Japanese Empire to include much of the Pacific Ocean and Southeast Asia. The maintenance of such an empire—spanning from China to Midway Island—required a sizable fleet capable of sustained control of territory. Although all of Japan's battleships built prior to the ''Yamato'' class had been completed before 1921—as the Washington Treaty had prevented any more from being completed—all had been either reconstructed or significantly modernized, or both, in the 1930s. This modernization included, among other things, additional speed and firepower, which the Japanese intended to use to conquer and defend their aspired-to empire. When Japan withdrew from the
League of Nations The League of Nations (french: link=no, Société des Nations ) was the first worldwide intergovernmental organisation whose principal mission was to maintain world peace. It was founded on 10 January 1920 by the Paris Peace Conference that ...
in 1934 over the Mukden Incident, it also renounced all treaty obligations, freeing it to build warships larger than those of the other major maritime powers. Japan's intention to acquire resource-producing colonies in the Pacific and Southeast Asia would likely lead to confrontation with the United States, thus the U.S. became Japan's primary potential enemy. The U.S. possessed significantly greater industrial power than Japan, with 32.2% of worldwide industrial production compared to Japan's 3.5%. Furthermore, several leading members of the
United States Congress The United States Congress is the legislature of the federal government of the United States. It is bicameral, composed of a lower body, the House of Representatives, and an upper body, the Senate. It meets in the U.S. Capitol in Washing ...
had pledged "to outbuild Japan three to one in a naval race." Consequently, as Japanese industrial output could not compete with American industrial power, Japanese ship designers developed plans for new battleships individually superior to their counterparts in the
United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...
. Each of these battleships would be capable of engaging multiple enemy capital ships simultaneously, eliminating the need to expend as much industrial effort as the U.S. on battleship construction.


Design

Preliminary studies for a new class of battleships began after Japan's departure from the
League of Nations The League of Nations (french: link=no, Société des Nations ) was the first worldwide intergovernmental organisation whose principal mission was to maintain world peace. It was founded on 10 January 1920 by the Paris Peace Conference that ...
and its renunciation of the
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and
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naval treaties; from 1934 to 1936, 24 initial designs were put forth. These early plans varied greatly in armament, propulsion, endurance, and armor. Main batteries fluctuated between and guns, while the secondary armaments were composed of differing numbers of , , and guns. Propulsion in most of the designs was a hybrid diesel-
turbine A turbine ( or ) (from the Greek , ''tyrbē'', or Latin ''turbo'', meaning vortex) is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. The work produced by a turbine can be used for generating ...
combination, though one relied solely on diesel and another planned for only turbines. The maximum range of the various designs was between in design A-140-J2 to a high of in designs A-140A and A-140-B2, at a speed of . Armor varied between providing protection from the fire of 406 mm guns to enough protection against 460 mm guns. After these had been reviewed, two of the original twenty-four were finalized as possibilities, A-140-F3 and A-140-F4. Differing primarily in their range ( versus at ), they were used in the formation of the final preliminary study, which was finished on 20 July 1936. Tweaks to that design resulted in the definitive design of March 1937,Garzke and Dulin, pp. 49–50 which was put forth by Rear-Admiral Fukuda Keiji; a range of 7,200 nmi was finally decided upon, and the hybrid diesel-turbine propulsion was abandoned in favor of turbines. The diesel engines were removed from the design because of problems with the engines aboard the submarine tender '' Taigei''. Their engines, which were similar to the ones that were going to be mounted in the new battleships, required a "major repair and maintenance effort"Garzke and Dulin, p. 49 to keep them running due to a "fundamental design defect". In addition, if the engines failed entirely, the armored citadel deck roof that protected the proposed diesel engine rooms and attendant machinery spaces, would severely hamper any attempt to remove and replace them. The final design called for a standard displacement of and a full-load displacement of ,Garzke and Dulin, p. 53 making the ships of the class the largest battleships yet designed, and the largest battleships ever constructed. The design called for a main armament of nine 460 mm naval guns, mounted in three three-gun turrets—each of which weighed more than a 1930s-era destroyer. The designs were quickly approved by the Japanese Naval high command,Johnston and McAuley, p. 122 over the objections of naval aviators, who argued for the construction of aircraft carriers rather than battleships.Even as far back as 1933, Imperial Japanese Navy aviators, including Admiral
Isoroku Yamamoto was a Marshal Admiral of the Imperial Japanese Navy (IJN) and the commander-in-chief of the Combined Fleet during World War II until he was killed. Yamamoto held several important posts in the IJN, and undertook many of its changes and reor ...
, argued that the best defense against U.S. carrier attacks would be a carrier fleet of their own, not a battleship fleet. However, "when controversy broke into the open, the older, conservative admirals held firm to their traditional faith in the battleship as the capital ship of the fleet by supporting the construction of the ...''Yamato''-class superbattleships." See: Reynolds, pp. 5–6
In all, five ''Yamato''-class battleships were planned.


Ships

Although five ''Yamato''-class vessels had been planned in 1937, only three—two battleships and a converted aircraft carrier—were completed. All three vessels were built in extreme secrecy, to prevent American intelligence officials from learning of their existence and specifications; indeed, the United States'
Office of Naval Intelligence The Office of Naval Intelligence (ONI) is the military intelligence agency of the United States Navy. Established in 1882 primarily to advance the Navy's modernization efforts, it is the oldest member of the U.S. Intelligence Community and serve ...
only became aware of ''Yamato'' and ''Musashi'' by name in late 1942. At this early time, their assumptions on the class's specifications were quite far off; while they were correct on their length, the class was given as having a beam of —in actuality, it was about and a displacement of 40,000–57,000 tons (actually, 69,000 tons). In addition, the main armament of ''Yamato'' class was given as nine guns as late as July 1945, four months after ''Yamato'' was sunk.Johnston and McAuley, p. 128 Both ''
Jane's Fighting Ships ''Jane's Fighting Ships'' by Janes Information Services is an annual reference book of information on all the world's warships arranged by nation, including information on ships' names, dimensions, armaments, silhouettes and photographs, etc. Ea ...
'' and the Western media also misreported the specifications of the ships. In September 1944, ''Jane's Fighting Ships'' listed the displacement of both ''Yamato'' and ''Musashi'' as 45,000 tons. Similarly, both the ''
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'' and the
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reported that the two ships displaced 45,000 tons with a speed of 30 knots, and even after the sinking of ''Yamato'' in April 1945, ''
The Times ''The Times'' is a British daily national newspaper based in London. It began in 1785 under the title ''The Daily Universal Register'', adopting its current name on 1 January 1788. ''The Times'' and its sister paper '' The Sunday Times'' (f ...
'' of London continued to give 45,000 tons as the ship's displacement. Nevertheless, the existence of the ships—and their supposed violation of naval treaties—heavily influenced American naval engineers in the design of the 60,500-ton s, though they were not designed specifically to counter the ''Yamato'' class.


''Yamato''

was ordered in March 1937, laid down 4 November 1937, launched 8 August 1940, and commissioned 16 December 1941. She underwent training exercises until 27 May 1942, when the vessel was deemed "operable" by Admiral
Isoroku Yamamoto was a Marshal Admiral of the Imperial Japanese Navy (IJN) and the commander-in-chief of the Combined Fleet during World War II until he was killed. Yamamoto held several important posts in the IJN, and undertook many of its changes and reor ...
. Joining the 1st Battleship Division, ''Yamato'' served as the flagship of the Japanese Combined Fleet during the
Battle of Midway The Battle of Midway was a major naval battle in the Pacific Theater of World War II that took place on 4–7 June 1942, six months after Japan's attack on Pearl Harbor and one month after the Battle of the Coral Sea. The U.S. Navy under ...
in June 1942, yet did not engage enemy forces during the battle. The next two years were spent intermittently between Truk and
Kure is a port and major shipbuilding city situated on the Seto Inland Sea in Hiroshima Prefecture, Japan. With a strong industrial and naval heritage, Kure hosts the second-oldest naval dockyard in Japan and remains an important base for the Japan ...
naval bases, with her sister ship ''Musashi'' replacing ''Yamato'' as the flagship of the Combined Fleet. During this time period, ''Yamato'', as part of the 1st Battleship Division, deployed on multiple occasions to counteract American carrier-raids on Japanese island bases. On 25 December 1943, she suffered major torpedo damage at the hands of and was forced to return to Kure for repairs and structural upgrades. In 1944—following extensive anti-aircraft and secondary battery upgrades—''Yamato'' joined the Second Fleet in the
Battle of the Philippine Sea The Battle of the Philippine Sea (June 19–20, 1944) was a major naval battle of World War II that eliminated the Imperial Japanese Navy's ability to conduct large-scale carrier actions. It took place during the United States' amphibious invas ...
, serving as an escort to a Japanese Carrier Division. In October 1944, as part of Vice-Admiral Takeo Kurita's Center Force for the Battle of Leyte Gulf, she used her naval artillery against an enemy vessel for the only time, helping sink the American escort carrier and the destroyer before she was forced away by torpedoes from , which put her out of combat. Lightly damaged at Kure in March 1945, the ship was then rearmed in preparation for operations. ''Yamato'' was deliberately expended in a suicide mission as part of
Operation Ten-Go , also known as Operation Heaven One (or Ten-ichi-gō 天一号), was the last major Japanese naval operation in the Pacific Theater of World War II. The resulting engagement is also known as the Battle of the East China Sea. In April 1945, t ...
, sent to use her big guns to provide relief to Japanese forces engaged in the Battle of Okinawa. She never came close, sunk en-route on 7 April 1945 by 386 American carrier aircraft. After receiving 10 torpedo and 7 bomb hits she capsized, taking 2,498 of the 2,700 crew-members with her, including Vice-Admiral Seiichi Itō. The sinking of ''Yamato'' was seen as a major American victory, and Hanson W. Baldwin, the military editor of ''
The New York Times ''The New York Times'' (''the Times'', ''NYT'', or the Gray Lady) is a daily newspaper based in New York City with a worldwide readership reported in 2020 to comprise a declining 840,000 paid print subscribers, and a growing 6 million paid d ...
'', wrote that "the sinking of the new Japanese battleship ''Yamato'' ... is striking proof—if any were needed—of the fatal weakness of Japan in the air and at sea".


''Musashi''

was ordered in March 1937, laid down 29 March 1938, launched 1 November 1940, and commissioned 5 August 1942. From September to December 1942, she was involved in surface and air-combat training exercises at Hashirajima. On 11 February 1943, ''Musashi'' relieved her sister ship ''Yamato'' as the flagship of the Combined Fleet. Until July 1944, ''Musashi'' shifted between the naval bases of Truk, Yokosuka, Brunei, and Kure. On 29 March 1944, she sustained moderate damage near the bow from one torpedo fired by the American submarine . After repairs and refitting throughout April 1944, ''Musashi'' joined the 1st Battleship Division in Okinawa. In June 1944, as part of the Second Fleet, the ship escorted Japanese aircraft carriers during the Battle of the Philippine Sea. In October 1944, she left Brunei as part of Admiral Takeo Kurita's Center Force during the Battle of Leyte Gulf. ''Musashi'' was sunk 24 October during the
Battle of the Sibuyan Sea The Battle of Leyte Gulf ( fil, Labanan sa golpo ng Leyte, lit=Battle of Leyte gulf; ) was the largest naval battle of World War II and by some criteria the largest naval battle in history, with over 200,000 naval personnel involved. It was fou ...
, taking 17 bomb and 19 torpedo hits, with the loss of 1,023 of her 2,399-man crew.


''Shinano''

''Shinano'', originally Warship Number 110, was laid down as the third member of the ''Yamato'' class, albeit with a slightly modified design. Most of the original armor values were slightly reduced, including the belt, deck, and turrets. The savings in weight this entailed meant that improvements could be made in other areas, including added protection for fire-control and lookout positions. In addition, the secondary armament on the first two ''Yamato''s was to have been replaced by the /65 caliber Type 98 gun. Although smaller, this gun was superior to the 127 mm, possessing a significantly greater muzzle velocity, maximum range, anti-aircraft ceiling, and rate of fire. In June 1942, following the Japanese defeat at Midway, construction of ''Shinano'' was suspended, and the hull was gradually rebuilt as an aircraft carrier. She was designed as a 64,800-ton support vessel that would be capable of ferrying, repairing and replenishing the air fleets of other carriers.Reynolds, p. 61 Although she was originally scheduled for commissioning in early 1945, the construction of the ship was accelerated after the Battle of the Philippine Sea;Reynolds, p. 284 this resulted in ''Shinano'' being launched on 5 October 1944 and commissioned a little more than a month later on 19 November. ''Shinano'' departed Yokosuka for Kure nine days later. In the early morning on 29 November, ''Shinano'' was hit by four torpedoes from . Although the damage seemed manageable, poor flooding control caused the vessel to list to starboard. Shortly before midday, she capsized and sank, taking 1,435 of her 2,400-man crew with her. To this day, ''Shinano'' is the largest naval vessel to have been sunk by a submarine.


Warships Number 111 and 797

Warship Number 111, never named, was planned as the fourth member of the ''Yamato'' class and the second ship to incorporate the improvements of ''Shinano''. The ship's
keel The keel is the bottom-most longitudinal structural element on a vessel. On some sailboats, it may have a hydrodynamic and counterbalancing purpose, as well. As the laying down of the keel is the initial step in the construction of a ship, in Br ...
was laid after ''Yamato''s launch in August 1940 and construction continued until December 1941, when the Japanese began to question their ambitious
capital ship The capital ships of a navy are its most important warships; they are generally the larger ships when compared to other warships in their respective fleet. A capital ship is generally a leading or a primary ship in a naval fleet. Strategic im ...
building program—with the coming of war, the resources essential in constructing the ship would become much harder to obtain. As a result, the hull of the fourth vessel, only about 30% complete, was taken apart and scrapped in 1942; materials from this were used in the conversions of and to hybrid battleship/aircraft carriers.Johnston and McAuley, p. 124Although the hull was scrapped, the double bottom was not; later construction of four large submarines took place on top of it. See: Garzke and Dulin, p. 84. Available sources do not report when the double bottom was scrapped. The fifth vessel, Warship Number 797, was planned as an improved ''Shinano'' but was never laid down. In addition to the modifications made to that ship, 797 would have removed the two wing turrets in favor of additional 100 mm guns; authors William Garzke and Robert Dulin estimate that this would have allowed for 24 of these weapons. ''Yamato'' was eventually modified in 1944 to something akin to this.


Specifications


Armaments


Primary armament

The ''Yamato-''class battleships had primary armaments consisting of three 3-gun turrets mounting /45 caliber Type 94 naval guns – the largest guns ever fitted to a warship,Johnston and McAuley, p. 123 although they were officially designated as the 40 cm/45 caliber (15.9 in) Type 94 – each of which weighed 2,774 tonnes for the complete mount.Jackson, p. 75 Each gun was long and weighed , and could fire armor-piercing shells and high explosive shells out to at a rate of 1½ to 2 shells per minute. The main guns were also capable of firing '' 3 Shiki tsûjôdan'' ("Common Type 3") anti-aircraft shells.These shells may have been nicknamed "The Beehive" while in service. See: A time fuze was used to set how far away the shells would explode (although they were commonly set to go off away). Upon detonation, each of these shells would release 900 incendiary-filled tubes in a 20° cone facing towards incoming aircraft; a bursting charge was then used to explode the shell itself to create more steel splinters, finally, the tubes would ignite. The tubes would burn for five seconds at about and would start a flame that was around long. Even though they comprised 40% of the total main ammunition load by 1944, ''3 Shiki tsûjôdan'' were rarely used in combat against enemy aircraft due to the severe damage the firing of these shells inflicted on the barrels of the main guns; indeed, one of the shells may have exploded early and disabled one of ''Musashi''s guns during the
Battle of the Sibuyan Sea The Battle of Leyte Gulf ( fil, Labanan sa golpo ng Leyte, lit=Battle of Leyte gulf; ) was the largest naval battle of World War II and by some criteria the largest naval battle in history, with over 200,000 naval personnel involved. It was fou ...
. The shells were intended to put up a barrage of flame that any aircraft attempting to attack would have to navigate through. However, U.S. pilots considered these shells to be more of a pyrotechnics display than a competent anti-aircraft weapon.


Secondary armament

In the original design, the ''Yamato'' class' secondary armament comprised twelve 15.5 cm/60 Type 3 guns mounted in four 3-gun turrets (one forward, two amidships, one aft), and twelve 12.7 cm/40 Type 89 guns in six double turrets (three on each side amidships). These had become available once the ''Mogami''-class cruisers were rearmed with guns. With a AP shell, the guns had a maximum range of at an elevation of 45 degrees. Their rate of fire was five rounds per minute. The two midships turrets were removed in 1944 in favor of additional heavy and light anti-aircraft guns. Initially, heavy
anti-aircraft defence Anti-aircraft warfare, counter-air or air defence forces is the battlespace response to aerial warfare, defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It includes Surface-to-air m ...
was provided by a dozen 40-caliber 127-mm Type 89 dual-purpose guns in six double turrets, three on each side of the superstructure. In 1944, the two amidship 15.5 cm turrets were removed to make room for three additional 127-mm mounts on each side of ''Yamato'', bringing the total number of these guns to twenty-four . When firing at surface targets, the guns had a range of ; they had a maximum ceiling of at their maximum elevation of 90 degrees. Their maximum rate of fire was 14 rounds a minute; their sustained rate of fire was around eight rounds per minute.


Anti-aircraft armament

The ''Yamato'' class originally carried twenty-four 25 mm Type 96 anti-aircraft guns, primarily mounted amidships. In 1944, both ''Yamato'' and ''Musashi'' underwent significant anti-aircraft upgrades in preparation for operations in Leyte Gulf using the space freed up by the removal of both midships secondary battery turrets,Johnston and McAuley, p. 180 and ended up with a complement of twenty-four guns, and one hundred and sixty-two antiaircraft guns, The 25 mm anti-aircraft guns could tilt at 90-degree angles to aim at planes directly overhead, but their mountings' lack of protection made their gunnery crews extremely vulnerable to direct enemy fire. These guns had an effective range of , and an effective ceiling of at an elevation of +85 degrees. The maximum effective rate of fire was only between 110 and 120 rounds per minute because of the frequent need to change the fifteen-round magazines. This was the standard Japanese light AA gun during World War II; it suffered from severe design shortcomings that rendered it a largely ineffective weapon. According to historian Mark Stille, the twin and triple mounts "lacked sufficient speed in train or elevation; the gun sights were unable to handle fast targets; the gun exhibited excessive vibration; the magazine was too small, and ... the gun produced excessive muzzle blast".Stille, p. 11 The class was also provided with two twin mounts for the licence-built 13.2 mm Type 93 anti-aircraft
machine gun A machine gun is a fully automatic, rifled autoloading firearm designed for sustained direct fire with rifle cartridges. Other automatic firearms such as automatic shotguns and automatic rifles (including assault rifles and battle rifles) ar ...
s, one on each side of the
bridge A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually somethi ...
. The maximum range of these guns was , but the effective range against aircraft was only . The cyclic rate was adjustable between 425 and 475 rounds per minute; the need to change 30-round
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reduced the effective rate to 250 rounds per minute. The armament on ''Shinano'' was quite different from that of her sister vessels due to her conversion. As the carrier was designed for a support role, significant anti-aircraft weaponry was installed on the vessel: sixteen guns, one hundred and twenty-five anti-aircraft guns, and three hundred and thirty-six anti-aircraft rocket launchers in twelve twenty-eight barrel turrets.Preston, p. 84 None of these guns were ever used against an enemy vessel or aircraft.


Armor

Designed to engage multiple enemy battleships simultaneously,Schom, p. 270 the ''Yamato''s were fitted with heavy armor plating described by naval historian Mark Stille as providing "an unparalleled degree of protection in surface combat". The main
belt Belt may refer to: Apparel * Belt (clothing), a leather or fabric band worn around the waist * Championship belt, a type of trophy used primarily in combat sports * Colored belts, such as a black belt or red belt, worn by martial arts practit ...
of armor along the side of the vessel was up to thick, with transverse bulkheads of the armoured citadel up to thick. A lower belt armor thick extending below the main belt was included in the ships as a response to gunnery experiments upon and the new Japanese Type 91 shell which could travel great lengths underwater.Garzke and Dulin, p. 94 Furthermore, the top hull shape was very advanced, the peculiar sideways curving effectively maximizing armor protection and structural rigidity while optimizing weight. The armor on the main turrets surpassed even that of the main belt, with turret face plating thick. Armor plates in both the main belt and main turrets were made of Vickers Hardened steel, which was a face-hardened steel armor.Garzke and Dulin, p. 65 Main armored deck— thick—was composed of a nickel-chromium-molybdenum alloy. Ballistics tests at the proving ground at Kamegakubi demonstrated the deck alloy to be superior to the homogeneous Vickers plates by 10–15%. Additional plating was designed by manipulating the chromium and nickel composition of the alloy. Higher contents of nickel allowed the plate to be rolled and bent without developing fracture properties. For torpedo protection, a multiple bulkhead side protection system was used which consisted of several void spaces as well as the lower belt armor; the system has a depth of and was designed to withstand a TNT charge. No torpedo defense system compartments were liquid loaded, despite the known benefits. This may have been the result of overestimating the effectiveness of the lower belt armor against torpedoes, an effort to decrease draft, and provision of additional counter-flooding spaces.U.S. Naval Technical Mission to Japan
The relatively new procedure of
arc welding Arc welding is a welding process that is used to join metal to metal by using electricity to create enough heat to melt metal, and the melted metals, when cool, result in a binding of the metals. It is a type of welding that uses a welding powe ...
was used extensively throughout the ship, strengthening the durability of the armor plating.Fitzsimons, Volume 24, p. 2609 Through this technique, the lower-side belt armor was used to strengthen the hull structure of the entire vessel. In total, the vessels of the ''Yamato'' class contained 1,147 watertight compartments, of which 1,065 were beneath the armored deck. The ships were also designed with a very large amount of reserve buoyancy to mitigate the effects of flooding. However, despite the immense armor thickness, the protection scheme of the ''Yamato'' class still suffered from several major design flaws and shortcomings. Structural weakness existed near the bow of the vessels, where the armor plating was generally thinner, as demonstrated by ''Musashi's'' damage from a torpedo hit in 1943.Steinberg, p. 54 The hull of the ''Shinano'' was subject to even greater structural weakness, being hastily constructed near the end of the war and having been equipped with incomplete armor and unsealed watertight compartments at the time of her sinking. The torpedo defense system performed substantially worse than designed. In particular, very poor jointing between the upper-belt and lower-belt armor created a rupture-prone seam just below the waterline. When combined with the relatively shallow system depth and the lack of liquid loading, this caused the class to be susceptible to torpedoes. Joint failures have been attributed to the considerable damage inflicted upon ''Yamato'' from a single torpedo impact in 1943, and to the sinking of ''Shinano'' from four hits in 1944.


Propulsion

The ''Yamato'' class was fitted with 12 Kampon boilers, which powered quadruple steam turbines,Jackson, p. 74 with an indicated horsepower of 147,948 (). These, in turn, drove four propellers. This powerplant enabled the ''Yamato'' class to achieve a top speed of . With this speed, the ''Yamato'' class' ability to function alongside fast carriers was limited. In addition, the fuel consumption rate of both battleships was very high.Jackson, p. 128 As a result, neither battleship was used in combat during the
Solomon Islands Campaign The Solomon Islands campaign was a major campaign of the Pacific War of World War II. The campaign began with Japanese landings and occupation of several areas in the British Solomon Islands and Bougainville, in the Territory of New Guinea, ...
or the minor battles during the "island hopping" period of 1943 and early 1944. The propulsion system of ''Shinano'' was slightly improved, allowing the carrier to achieve a top speed of .


"Super ''Yamato''"-class battleships

Two battleships of an entirely new and larger design were planned as a part of the 1942 fleet replenishment program. Designated as Design A-150 and initially named Warship Number 178 and Warship Number 179, plans for the ships began soon after the design of the ''Yamato'' class was finished, probably in 1938–39. Everything was "essentially completed" sometime in 1941, but with war on the horizon, work on the battleships was halted to fill a need for additional warships, such as aircraft carriers and cruisers, to replace war losses of those vital ships. The Japanese loss in the
Battle of Midway The Battle of Midway was a major naval battle in the Pacific Theater of World War II that took place on 4–7 June 1942, six months after Japan's attack on Pearl Harbor and one month after the Battle of the Coral Sea. The U.S. Navy under ...
, where four carriers were sunk (out of ten, to date, in the entire navy), made it certain that work on the ships would never begin. In the third volume of their ''Battleships'' series, ''Axis and Neutral Battleships in World War II'', the authors William H. Garzke and Robert O. Dulin asserted that these ships would have been the "most powerful battleships in history" because of their massive
main battery A main battery is the primary weapon or group of weapons around which a warship is designed. As such, a main battery was historically a gun or group of guns, as in the broadsides of cannon on a ship of the line. Later, this came to be turreted ...
and extensive anti-aircraft weaponry.Gardiner and Chesneau, p. 178Garzake and Dulin, pp. 85–86 Similar to the fate of papers relating to the ''Yamato'' class, most papers and all plans relating to the class were destroyed to prevent capture at the end of the war. It is known that the final design of the ships would have had an even greater firepower and size than the ''Yamato'' class—a main battery of six guns in three turrets and secondary dual purpose armament consisting of twenty-four dual mounted guns (similar to the s). The
displacement Displacement may refer to: Physical sciences Mathematics and Physics * Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path ...
was to be bigger than the ''Yamato''s, and a side
armor belt Belt armor is a layer of heavy metal armor plated onto or within the outer hulls of warships, typically on battleships, battlecruisers and cruisers, and aircraft carriers. The belt armor is designed to prevent projectiles from penetrating ...
of was planned.


Destruction of records

On the eve of the Allies' occupation of Japan, special-service officers of the Imperial Japanese Navy destroyed virtually all records, drawings, and photographs of or relating to the ''Yamato''-class battleships, leaving only fragmentary records of the design characteristics and other technical matters. The destruction of these documents was so efficient that until 1948 the only known images of ''Yamato'' and ''Musashi'' were those taken by
United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...
aircraft involved in the attacks on the two battleships. Although some additional photographs and information, from documents that were not destroyed, have come to light over the years, the loss of the majority of written records for the class has made extensive research into the ''Yamato'' class somewhat difficult. Because of the lack of written records, information on the class largely came from interviews of Japanese officers following Japan's surrender. However, in October 1942, based upon a special request from
Adolf Hitler Adolf Hitler (; 20 April 188930 April 1945) was an Austrian-born German politician who was dictator of Nazi Germany, Germany from 1933 until Death of Adolf Hitler, his death in 1945. Adolf Hitler's rise to power, He rose to power as the le ...
, German Admiral Paul Wenneker, attached to the German Naval Attache in Japan, was allowed to inspect a ''Yamato''-class battleship while it was undergoing maintenance in a dockyard, at which time Admiral Wenneker cabled a detailed description of the warship to Berlin. On 22 August 1943, Erich Groner, a German naval historian, and author of the book ''Die Deutschen Kriegschiffe, 1815–1945'', was shown the report while at the "
Führer Headquarters The ''Führer'' Headquarters (german: Führerhauptquartiere), abbreviated FHQ, were a number of official headquarters used by the Nazi leader Adolf Hitler and various other German commanders and officials throughout Europe during the Second World ...
", and was directed to make an "interpretation" and then prepare a "design sketch drawing" of the Japanese battleship. The material was preserved by Erich Groner's wife, Mrs. H. Groner, and submitted to publishers in the 1950s.


Cultural significance

From the time of their construction until the present day, ''Yamato'' and ''Musashi'' have carried a notable presence in Japanese culture, ''Yamato'' in particular. Upon completion, the battleships represented the epitome of Imperial Japanese naval engineering. In addition, the two ships, due to their size, speed, and power, visibly embodied Japan's determination and readiness to defend its interests against the western powers, especially the United States.
Shigeru Fukudome was an admiral and Chief of Staff of the Imperial Japanese Navy during World War II. Biography Early life and career Born in Yonago, Tottori prefecture, Fukudome graduated from the 40th class of the Imperial Japanese Naval Academy in 1913, ran ...
, chief of the Operations Section of the
Imperial Japanese Navy General Staff The was the highest organ within the Imperial Japanese Navy. In charge of planning and operations, it was headed by an Admiral headquartered in Tokyo. History Created in 1893, the Navy General Staff took over operational (as opposed to adminis ...
, described the two ships as "symbols of naval power that provided to officers and men alike a profound sense of confidence in their navy." ''Yamato'', and especially the story of her sinking, has appeared often in
Japanese popular culture Japanese popular culture includes Japanese cinema, cuisine, television programs, anime, manga, video games, music, and doujinshi, all of which retain older artistic and literary traditions; many of their themes and styles of presentation can be ...
, such as the
anime is hand-drawn and computer-generated animation originating from Japan. Outside of Japan and in English, ''anime'' refers specifically to animation produced in Japan. However, in Japan and in Japanese, (a term derived from a shortening of ...
''
Space Battleship Yamato is a Japanese science fiction anime series produced and written by Yoshinobu Nishizaki, directed by manga artist Leiji Matsumoto, and produced by Academy Productions. The series aired in Yomiuri TV from October 6, 1974 to March 30, 1975 ...
'' and the 2005 film ''Yamato''. The appearances in popular culture usually portray the ship's last mission as a brave, selfless, but futile, symbolic effort by the participating Japanese sailors to defend their homeland. One of the reasons that the warship may have such significance in Japanese culture is that the word "Yamato" was often used as a poetic name for Japan. Thus, the end of the battleship ''Yamato'' could serve as a metaphor for the end of the Japanese empire.Skulski, p. 7


See also

*
H-class battleship proposals The H class was a series of battleship designs for Nazi Germany's ''Kriegsmarine'', which were intended to fulfill the requirements of Plan Z in the late 1930s and early 1940s. The first variation, "H-39," called for six ships to be built, essen ...
(World War II German '' Kriegsmarine'') * (U. S. Navy) *
Yamato Museum The is the nickname of the in Kure, Hiroshima, Japan. History The museum opened on April 23, 2005. It is nicknamed the Yamato Museum due to the display in the lobby of a 1/10 scale model of the battleship ''Yamato'', the flagship of the ...
* Purpose-built ship to carry main gun turrets and barrels of the class


Notes


Footnotes


References

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Further reading

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External links


Kure Yamato Museum
{{DEFAULTSORT:Yamato Class Battleship Battleship classes