The were two
battleship
A battleship is a large, heavily naval armour, armored warship with a main battery consisting of large naval gun, guns, designed to serve as a capital ship. From their advent in the late 1880s, battleships were among the largest and most form ...
s 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, Potsdam Declaration, when it was dissolved followin ...
, and ,
laid down
Laying the keel or laying down is the formal recognition of the start of a ship's construction. It is often marked with a ceremony attended by dignitaries from the shipbuilding company and the ultimate owners of the ship.
Keel laying is one ...
leading up to the
Second World War
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
and completed as designed. A third hull, laid down in 1940, was converted to the
aircraft carrier
An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and hangar facilities for supporting, arming, deploying and recovering carrier-based aircraft, shipborne aircraft. Typically it is the ...
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 more specialized roles in surface warfare such as naval gunfire support (NGFS) and anti-aircraft warfare (AAW) engagements. ...
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.
submarine
A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited underwater capability.) The term "submarine" is also sometimes used historically or infor ...
s and aircraft carriers, both ''Yamato'' and ''Musashi'' spent the majority of their careers in naval bases at
Brunei
Brunei, officially Brunei Darussalam, is a country in Southeast Asia, situated on the northern coast of the island of Borneo. Apart from its coastline on the South China Sea, it is completely surrounded by the Malaysian state of Sarawak, with ...
,
Truk, and
Kure—deploying on several occasions in response to U.S. raids on Japanese bases.
All three ships were sunk by the
U.S. Navy; ''Musashi'' by air strikes while participating in the
Battle of Leyte Gulf
The Battle of Leyte Gulf () 23–26 October 1944, 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.
By late 1944, Japan possessed fewer capital sh ...
in October 1944, ''Shinano'' after being torpedoed by the submarine while under way from
Yokosuka
is a city in Kanagawa Prefecture, Japan.
, the city has a population of 373,797, and a population density of . The total area is . Yokosuka is the 11th-most populous city in the Greater Tokyo Area, and the 12th in the Kantō region. The city i ...
to
Kure for fitting out in November 1944, and ''Yamato'' by air strikes while en route from Japan to
Okinawa
most commonly refers to:
* Okinawa Prefecture, Japan's southernmost prefecture
* Okinawa Island, the largest island of Okinawa Prefecture
* Okinawa Islands, an island group including Okinawa itself
* Okinawa (city), the second largest city in th ...
as part of
Operation Ten-Go 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'' or Decisive Battle Doctrine, a ]naval strategy
Naval strategy is the planning and conduct of war at sea, the naval equivalent of military strategy on land.
Naval strategy, and the related concept of maritime strategy, concerns the overall strategy for achieving victory at sea, including th ...
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, Potsdam Declaration, when it was dissolved followin ...
prior to the Second World War
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
, 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 (April 11, 1862 – August 27, 1948) was an American politician, academic, and jurist who served as the 11th chief justice of the United States from 1930 to 1941. A member of the Republican Party (United States), Republican ...
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 (or the Washington Conference on the Limitation of Armament) was a disarmament conference called by the United States and held in Washington, D.C., from November 12, 1921, to February 6, 1922.
It was conducted out ...
resulted in the Washington Naval Treaty
The Washington Naval Treaty, also known as the Five-Power Treaty, was signed during 1922 among the major Allies of World War I, Allies of World War I, which agreed to prevent an arms race by limiting Navy, naval construction. It was negotiated at ...
. Along with many other provisions, it limited all future battleships to a standard displacement 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 extremist form of nationalism in which a country asserts or maintains hegemony, supremacy, or other forms of control over other nations (usually through violent coercion) to pursue its specific ...
militancy. This movement called for the expansion of the Empire of Japan
The Empire of Japan, also known as the Japanese Empire or Imperial Japan, was the Japanese nation state that existed from the Meiji Restoration on January 3, 1868, until the Constitution of Japan took effect on May 3, 1947. From Japan–Kor ...
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 (LN or LoN; , SdN) 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 (1919–1920), Paris Peace ...
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, legislative branch of the federal government of the United States. It is a Bicameralism, bicameral legislature, including a Lower house, lower body, the United States House of Representatives, ...
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 naval warfare, maritime military branch, service branch of the United States Department of Defense. It is the world's most powerful navy with the largest Displacement (ship), displacement, at 4.5 millio ...
. 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 (LN or LoN; , SdN) 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 (1919–1920), Paris Peace ...
and its renunciation of the Washington and London
London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...
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 can be used for generating electrical ...
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 carrier
An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and hangar facilities for supporting, arming, deploying and recovering carrier-based aircraft, shipborne aircraft. Typically it is the ...
s 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. He commanded the fleet from 1939 until his death in 1943, overseeing the start of the Pacific War in 1941 and J ...
, 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 serv ...
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
''Janes Fighting Ships'' is an annual reference book of each country's warship, navy and coast guard, along with their weapons and aircraft. Included are ship names, construction data, size, speed, range, complement, engineering, armament, a ...
'' 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 ''New York Times
''The New York Times'' (''NYT'') is an American daily newspaper based in New York City. ''The New York Times'' covers domestic, national, and international news, and publishes opinion pieces, investigative reports, and reviews. As one of ...
'' and the Associated Press
The Associated Press (AP) is an American not-for-profit organization, not-for-profit news agency headquartered in New York City.
Founded in 1846, it operates as a cooperative, unincorporated association, and produces news reports that are dist ...
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 Newspaper#Daily, daily Newspaper#National, national newspaper based in London. It began in 1785 under the title ''The Daily Universal Register'', adopting its modern name on 1 January 1788. ''The Times'' and its si ...
'' 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
Laying the keel or laying down is the formal recognition of the start of a ship's construction. It is often marked with a ceremony attended by dignitaries from the shipbuilding company and the ultimate owners of the ship.
Keel laying is one ...
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. He commanded the fleet from 1939 until his death in 1943, overseeing the start of the Pacific War in 1941 and J ...
.[ 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 Ocean theater of World War II, 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 t ...
in June 1942, yet did not engage enemy forces during the battle. The next two years were spent intermittently between Truk and Kure 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, 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
The Battle of Leyte Gulf () 23–26 October 1944, 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.
By late 1944, Japan possessed fewer capital sh ...
, 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,
sent to use her big guns to provide relief to Japanese forces engaged in the ]Battle of Okinawa
The , codenamed Operation Iceberg, was a major battle of the Pacific War fought on the island of Okinawa Island, Okinawa by United States Army and United States Marine Corps forces against the Imperial Japanese Army during the Pacific War, Impe ...
. While en-route she was sunk 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
was an admiral in the Imperial Japanese Navy and the flag officer of the task force centered around the battleship on her final mission towards the end of World War II.
Biography Early career
Born in Miike County Takada Town (present day ...
.[ 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'' (''NYT'') is an American daily newspaper based in New York City. ''The New York Times'' covers domestic, national, and international news, and publishes opinion pieces, investigative reports, and reviews. As one of ...
'', 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, 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
Muzzle velocity is the speed of a projectile (bullet, pellet, slug, ball/ shots or shell) with respect to the muzzle at the moment it leaves the end of a gun's barrel (i.e. the muzzle). Firearm muzzle velocities range from approximately t ...
, 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 of a watercraft, important for stability. On some sailboats, it may have a fluid dynamics, hydrodynamic and counterbalancing purpose as well. The keel laying, laying of the keel is often ...
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 i ...
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. 124][Although 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 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 was provided by a dozen 40-caliber 127-mm Type 89 ]dual-purpose gun
A dual-purpose gun is a naval artillery mounting designed to engage both surface and air targets.
Description
Second World War-era capital ships had four classes of artillery: the heavy main battery, intended to engage opposing battleships and ...
s 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 (2008), p. 11]
The class was also provided with two twin mounts for the licence-built 13.2 mm Type 93 anti-aircraft machine guns, one on each side of the bridge
A bridge is a structure built to Span (engineering), span a physical obstacle (such as a body of water, valley, road, or railway) without blocking the path underneath. It is constructed for the purpose of providing passage over the obstacle, whi ...
. 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 magazines
A magazine is a periodical literature, periodical publication, print or digital, produced on a regular schedule, that contains any of a variety of subject-oriented textual and visual content (media), content forms. Magazines are generally fin ...
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 forty-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 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
Vickers was a British engineering company that existed from 1828 until 1999. It was formed in Sheffield as a steel foundry by Edward Vickers and his father-in-law, and soon became famous for casting church bells. The company went public in 18 ...
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 joining of the metals. It is a type of welding that uses a welding power ...
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 turbine
A steam turbine or steam turbine engine is a machine or heat engine that extracts thermal energy from pressurized steam and uses it to do mechanical work utilising a rotating output shaft. Its modern manifestation was invented by Sir Charles Par ...
s,[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 military campaign, campaign of the Pacific War during World War II. The campaign began with the Empire of Japan, Japanese seizure of several areas in the British Solomon Islands and Bougainville Island, B ...
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 Ocean theater of World War II, 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 t ...
, where four carriers were sunk (out of ten, at that time, 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 naval gun or group of guns used in volleys, as in the broadsides of cannon on a ship of the line. Later, th ...
and extensive anti-aircraft weaponry.[Gardiner and Chesneau, p. 178][Garzake 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 of was planned.[
]
Destruction of records
On the eve of the Allies' occupation of Japan
Japan was occupied and administered by the Allies of World War II from the surrender of the Empire of Japan on September 2, 1945, at the war's end until the Treaty of San Francisco took effect on April 28, 1952. The occupation, led by the ...
, 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 naval warfare, maritime military branch, service branch of the United States Department of Defense. It is the world's most powerful navy with the largest Displacement (ship), displacement, at 4.5 millio ...
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 1889 – 30 April 1945) was an Austrian-born German politician who was the dictator of Nazi Germany from 1933 until Death of Adolf Hitler, his suicide in 1945. Adolf Hitler's rise to power, He rose to power as the lea ...
, 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", 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, chief of the Operations Section of the Imperial Japanese Navy General Staff
The was the highest organ within the Imperial Japanese Navy (IJN). 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 a ...
, 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 Cinema of Japan, Japanese cinema, Japanese cuisine, cuisine, Television in Japan, television programs, anime, manga, Video gaming in Japan, video games, Music of Japan, music, and doujinshi, all of which retain ol ...
, such as the anime
is a Traditional animation, hand-drawn and computer animation, computer-generated animation originating from Japan. Outside Japan and in English, ''anime'' refers specifically to animation produced in Japan. However, , in Japan and in Ja ...
''Space Battleship Yamato
is a Japanese science fiction anime series 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, totaling u ...
'' 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 Empire of Japan
The Empire of Japan, also known as the Japanese Empire or Imperial Japan, was the Japanese nation state that existed from the Meiji Restoration on January 3, 1868, until the Constitution of Japan took effect on May 3, 1947. From Japan–Kor ...
.[Skulski, p. 7]
See also
* H-class battleship proposals (World War II German ''Kriegsmarine
The (, ) was the navy of Nazi Germany from 1935 to 1945. It superseded the Imperial German Navy of the German Empire (1871–1918) and the inter-war (1919–1935) of the Weimar Republic. The was one of three official military branch, branche ...
'')
* Yamato Museum
* Purpose-built ship to carry main gun turrets and barrels of the class
Notes
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Further reading
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External links
Kure Yamato Museum
{{DEFAULTSORT:Yamato Class Battleship
Battleship classes