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Superfiring armament is a naval military building technique in which two (or more) turrets are located one behind the other, with the rear turret located above ("super") the one in front so that it can fire over the first. This configuration meant that both forward and aft turrets could fire at any target within their sector, even when the target was directly ahead of the turrets.
Historically, large surface warships were known by the generic label of battleships, with a further distinction between pre-dreadnoughts and dreadnoughts. The era of technical evolution occurred roughly from 1900 to 1945. Part of the technical evolution was driven by the need to compress as much large-gun firepower into the smallest space possible. In early designs, the large-caliber turrets were all located on the same plane firing to one side or the other. In firing ahead or to the rear, usually only the forward-most or rearmost turret could fire, especially at low angles.
An early concern was that the pressure and shock from the higher turret would damage the lower one when firing over the top. In 1908, United States Navy tests using the monitor USS Florida (BM-9) as the testbed proved that superfiring was safe. The result was the design for the first South Carolina-class battleship (commissioned in 1910).
The first ship with superfiring artillery (though not of the same caliber), was the French battleship Henri IV, launched in 1899. [1]
Superfiring was not limited to two turrets. For example, the Atlanta-class of light cruiser, which were developed and built for service in World War II, utilized a triple-overlap system both forward and astern, their armament of dual-mount 5"/38 caliber dual-purpose main armament having a nearly unobstructed arc of fire. The British Dido-class, which were also light cruisers armed entirely with dual-purpose guns (the 5.25" Mk 1), also had three turrets forward, with two aft.
Advantages of superfiring turrets over non-superfiring arrangements include improved firing arcs for all except the foremost and rearmost turrets, as well as an increase of useful deck space on which to build the ship's superstructure due to the concentration of the main batteries towards the ends of the ship. Depending on the design of the ship and its weapons, it may also help to avoid issues with the ship's propulsion.
The disadvantage of this arrangement is a higher center of mass as a result of the higher placement of turrets, thus decreasing the metacentric height. The resulting decrease in stability may need to be corrected by compromises elsewhere to keep the center of mass low.
Because of this, superfiring arrangements, while common, are not used exclusively. Examples of non-superfiring designs include but are not limited to the Gangut , Imperatritsa Mariya , and Imperator Nikolai classes of battleships built for the Imperial Russian navy, as well as modern ships such as the Zumwalt-class destroyers. In addition, many ships, such as the New York-class battleships, used combinations of superfiring and non-superfiring arrangements. Exclusively non-superfiring arrangements also remained common on destroyers.
The battlecruiser was a type of capital ship of the first half of the 20th century. These were similar in displacement, armament and cost to battleships, but differed in form and balance of attributes. Battlecruisers typically had thinner armour and a somewhat lighter main gun battery than contemporary battleships, installed on a longer hull with much higher engine power in order to attain greater speeds. The first battlecruisers were designed in the United Kingdom, as a development of the armoured cruiser, at the same time as the dreadnought succeeded the pre-dreadnought battleship. The goal of the design was to outrun any ship with similar armament, and chase down any ship with lesser armament; they were intended to hunt down slower, older armoured cruisers and destroy them with heavy gunfire while avoiding combat with the more powerful but slower battleships. However, as more and more battlecruisers were built, they were increasingly used alongside the better-protected battleships.
USS Mississippi (BB-41/AG-128), the second of three members of the New Mexico class of battleship, was the third ship of the United States Navy named in honor of the 20th state. The ship was built at the Newport News Shipbuilding Company of Newport News, Virginia, from her keel laying in April 1915, her launching in January 1917, and her commissioning in December that year. She was armed with a battery of twelve 14-inch (356 mm) guns in four three-gun turrets, and was protected by heavy armor plate, with her main belt armor being 13.5 inches (343 mm) thick.
The Pensacola class was a class of United States Navy heavy cruiser, the first "treaty cruisers" designed under the limitations set by the Washington Naval Treaty, which limited cruisers to a maximum of 10,000 long tons (10,160 t) displacement and a maximum main battery caliber of 8-inch (203 mm).
SMS Lützow was the second Derfflinger-class battlecruiser built by the German Kaiserliche Marine before World War I. Ordered as a replacement for the old protected cruiser Kaiserin Augusta, Lützow was launched on 29 November 1913, but not completed until 1916. Lützow was a sister ship to Derfflinger from which she differed slightly in that she was armed with an additional pair of 15 cm (5.9 inch) secondary guns and had an additional watertight compartment in her hull. She was named in honor of the Prussian general Ludwig Adolf Wilhelm von Lützow who fought in the Napoleonic Wars.
The Florida-class battleships of the United States Navy comprised two ships: Florida and Utah. Launched in 1910 and 1909 respectively and commissioned in 1911, they were slightly larger than the preceding Delaware class design but were otherwise very similar. This was the first US battleship class in which all ships received steam turbine engines. In the previous Delaware-class, North Dakota received steam turbine propulsion as an experiment while Delaware retained triple-expansion engines.
The Delaware-class battleships of the United States Navy were the second class of American dreadnoughts. With this class, the 16,000 long tons (16,257 t) limit imposed on capital ships by the United States Congress was waived, which allowed designers at the Navy's Bureau of Construction and Repair to correct what they considered flaws in the preceding South Carolina class and produce ships not only more powerful but also more effective and rounded overall. Launched in 1909, these ships became the first in US naval history to exceed 20,000 long tons (20,321 t).
Pre-dreadnought battleships were sea-going battleships built from the mid- to late- 1880s to the early 1900s. Their designs were conceived before the appearance of HMS Dreadnought in 1906 and their classification as "pre-dreadnought" is retrospectively applied. In their day, they were simply known as "battleships" or else more rank-specific terms such as "first-class battleship" and so forth. The pre-dreadnought battleships were the pre-eminent warships of their time and replaced the ironclad battleships of the 1870s and 1880s.
A gun turret is a mounting platform from which weapons can be fired that affords protection, visibility and ability to turn and aim. A modern gun turret is generally a rotatable weapon mount that houses the crew or mechanism of a projectile-firing weapon and at the same time lets the weapon be aimed and fired in some degree of azimuth and elevation.
Gangut was both the lead ship of the Gangut-class dreadnoughts of the Imperial Russian Navy built before World War I and the last of her class to be completed. She was named after the Russian victory over the Swedish Navy in the Battle of Gangut in 1714. She was completed during the winter of 1914–1915, but was not ready for combat until mid-1915. Her role was to defend the mouth of the Gulf of Finland against the Germans, who never tried to enter, so she spent her time training and providing cover for minelaying operations. Her crew joined the general mutiny of the Baltic Fleet after the February Revolution and joined the Bolsheviks in 1918. She was laid up in 1918 for lack of manpower and not recommissioned until 1925, by which time she had been renamed Oktyabrskaya Revolutsiya.
The König class was a group of four dreadnought battleships built for the German Kaiserliche Marine in the early 1910s. The class comprised König, the lead ship, Grosser Kurfürst, Markgraf, and Kronprinz. The design for the ships was derived from the preceding Kaiser class, using the same basic hull but with a rearranged main battery of ten 30.5 cm (12 in) guns in five twin-gun turrets to improve the guns' firing arcs. Instead of the staggered wing turrets used in the Kaisers, the Königs placed their main guns all on the centerline using superfiring pairs fore and aft. Budgetary constraints and the need to begin construction quickly to compete with Britain in the Anglo-German naval arms race prevented any more radical changes. Diesel engines were planned for the ships, but they could not be readied in time, so all four vessels reverted to steam turbines for their propulsion system.
The Richelieu class were fast battleships built for the French Navy between the 1930s and 1950s. Initially two ships were ordered in 1935 in response to Italian orders for the Littorio-class battleships the previous year. The Richelieus were based on the preceding Dunkerque class, but scaled up to accommodate more powerful 380 mm (15 in) guns and armor to protect them from guns of the same caliber. To keep the ships within the displacement limits imposed by the Washington Naval Treaty, they featured the same concentrated arrangement as the Dunkerques for the main battery: two quadruple gun turrets placed forward. They also incorporated new, more compact boilers that allowed for a shorter hull for the desired top speed. After Germany ordered two Bismarck-class battleships, France responded with another pair of Richelieus, to be built to modified designs. The first, Clemenceau, would have received modified secondary and anti-aircraft batteries, while Gascogne would have had had her superfiring main battery turret shifted aft, along with other changes. Clemenceau was never completed, and Gascogne was never laid down. The Richelieus were the last battleships built for the French Navy.
Petropavlovsk was the third of the four Gangut-class dreadnoughts built before World War I for the Imperial Russian Navy, the first Russian class of dreadnoughts. She was named after the Russian victory in the siege of Petropavlovsk during the Crimean War. The ship was completed during the winter of 1914–1915, but was not ready for combat until mid-1915. Her role was to defend the mouth of the Gulf of Finland against the Germans, who never tried to enter, so she spent her time training and providing cover for minelaying operations. Her crew joined the general mutiny of the Baltic Fleet after the February Revolution of 1917 and she was the only dreadnought available to the Bolsheviks for several years after the October Revolution of 1917. She bombarded the mutinous garrison of Fort Krasnaya Gorka and supported Bolshevik light forces operating against British ships supporting the White Russians in the Gulf of Finland in 1918–1919. Later, her crew joined the Kronstadt Rebellion of 1921 and she was renamed Marat after the rebellion was crushed.
The O class was a planned class of three battlecruisers for the Kriegsmarine before World War II. Prompted by a perceived lack in ship numbers when compared with the British Royal Navy, the O class' design was born with the suggestion of modifying the P-class cruiser design with 380 mm (15 in) guns instead of 283 mm (11.1 in).
The Lyon class was a set of battleships planned for the French Navy in 1913, with construction scheduled to begin in 1915. The class was to have comprised four ships, named Lyon, Lille, Duquesne, and Tourville. The first two were named for cities in France, and the latter pair honored the French admirals Abraham Duquesne and Anne Hilarion de Tourville. The Lyon class' design was an improvement on the previous Normandie class, utilizing a fourth quadruple-gun turret to mount a total of sixteen 34 cm (13.4 in) guns. Construction on the Lyons was cancelled due to the August 1914 outbreak of World War I, before any of the ships were laid down.
The Nassau class was a group of four dreadnought battleships built for the German Kaiserliche Marine in the early 1900s. The class comprised Nassau, the lead ship, Rheinland, Posen, and Westfalen. All four ships were laid down in mid-1907, and completed by late 1910. Though commonly perceived as having been built in response to the British Dreadnought, their design traces its origin to 1903; they were in fact a response to Dreadnought's predecessors of the Lord Nelson class. The Nassaus adopted a main battery of twelve 28 cm (11 in) guns in six twin-gun turrets in an unusual hexagonal arrangement. Unlike many other dreadnoughts, the Nassau-class ships retained triple-expansion steam engines instead of more powerful steam turbines.
The dreadnought was the predominant type of battleship in the early 20th century. The first of the kind, the Royal Navy's HMS Dreadnought, had such an effect when launched in 1906 that similar battleships built after her were referred to as "dreadnoughts", and earlier battleships became known as pre-dreadnoughts. Her design had two revolutionary features: an "all-big-gun" armament scheme, with an unprecedented number of heavy-calibre guns, and steam turbine propulsion. As dreadnoughts became a crucial symbol of national power, the arrival of these new warships renewed the naval arms race between the United Kingdom and Germany. Dreadnought races sprang up around the world, including in South America, lasting up to the beginning of World War I. Successive designs increased rapidly in size and made use of improvements in armament, armour, and propulsion throughout the dreadnought era. Within five years, new battleships outclassed Dreadnought herself. These more powerful vessels were known as "super-dreadnoughts". Most of the original dreadnoughts were scrapped after the end of World War I under the terms of the Washington Naval Treaty, but many of the newer super-dreadnoughts continued serving throughout World War II.
The Moltke class was a class of two "all-big-gun" battlecruisers of the German Imperial Navy built between 1909–1911. Named SMS Moltke and SMS Goeben, they were similar to the previous battlecruiser Von der Tann, but the newer design featured several incremental improvements. The Moltkes were slightly larger, faster, and better armored, and had an additional pair of 28 cm (11 in) guns.
L 20e α was a design for a class of battleships to be built in 1918 for the German Kaiserliche Marine during World War I. Design work on the class of battleship to succeed the Bayern-class battleships began in 1914, but the outbreak of World War I in July 1914 led to these plans being shelved. Work resumed in early 1916 and lessons from the Battle of Jutland, fought later that year, were incorporated into the design. Reinhard Scheer, the commander of the fleet, wanted larger main guns and a higher top speed than earlier vessels, to combat the latest ships in the British Royal Navy. A variety of proposals were submitted, with armament ranging from the same eight 38 cm (15 in) guns of the Bayern class to eight 42 cm (16.5 in) guns.
Two South Carolina-class battleships, also known as the Michigan class, were built for the United States Navy in the early twentieth century. Named South Carolina and Michigan, they were the first American dreadnoughts—powerful warships whose capabilities far outstripped those of the world's older battleships.
The Minotaur class, or Design Z, was a proposed class of light cruisers planned for the British Royal Navy shortly after the Second World War. Design Z had several proposed configurations with differing armament and propulsion arrangements. The designs were large ships that were planned to be armed with ten 6 in (152 mm) dual purpose guns and an extensive array of 3 in (76 mm) secondary guns. Six ships of the class were planned in 1947 but they were ultimately cancelled before construction could begin, owing to the post-war economic difficulties of the United Kingdom and shifting naval priorities.