Turret ship
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Turret ships were a 19th-century type of warship, the earliest to have their guns mounted in a revolving gun turret, instead of a broadside arrangement.
BackgroundEdit
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Before the development of large-calibre, long-range guns in the mid-19th century, the classic ship of the line design used rows of port-mounted guns on each side of the ship, often mounted in casemates. Firepower was provided by a large number of guns which could only be aimed in a limited arc from one side of the ship. Due to instability, fewer larger and heavier guns can be carried on a ship. Also, the casemates often sat near the waterline, which made them vulnerable to flooding and restricted their use to calm seas.
Turrets were weapon mounts designed to protect the crew and mechanism of the artillery piece and with the capability of being aimed and fired in many directions as a rotating weapon platform. This platform can be mounted on a fortified building or structure such as an anti-naval land battery, or on a combat vehicle, a naval ship, or a military aircraft.
OriginsEdit
Designs for a rotating gun turret date back to the late 18th century.<ref>Template:Cite book</ref> Practical rotating turret warships were independently developed in Great Britain and the United States with the availability of steam power in the mid-19th Century.
British developmentsEdit
During the Crimean War, Captain Cowper Phipps Coles of the British Royal Navy constructed a raft with guns protected by a 'cupola' and used the raft, named Lady Nancy, to shell the Russian town of Taganrog in the Black Sea. Lady Nancy "proved a great success",<ref name="captain1p21">Template:Cite book</ref> and Coles patented his rotating turret after the war. Following Coles' patenting, the British Admiralty ordered a prototype of Coles' design in 1859, which was installed in the floating battery vessel, Template:HMS, for trials in 1861, becoming the first vessel to be fitted with a revolving gun turret. Coles' design aim was to create a ship with the greatest possible all round arc of fire, as low in the water as possible to minimise the target.<ref name="Barnaby">Template:Cite book</ref>
The British Admiralty accepted the principle of the gun turret as a useful innovation, and incorporated it into other new designs. Coles submitted a design for a ship having ten domed turrets each housing two large guns. The design was rejected as impractical, although the Admiralty remained interested in turret ships and instructed its own designers to create better designs.
Coles enlisted the support of Prince Albert, who wrote to the First Lord of the Admiralty, the Duke of Somerset, supporting the construction of a turret ship. In January 1862, the Admiralty agreed to construct a ship, Template:HMS, which had four turrets and a low freeboard, intended only for coastal defence. Coles was allowed to design the turrets, but the ship was the responsibility of the chief Constructor Isaac Watts.<ref name="Barnaby"/>
Another of Coles's designs, Template:HMS, was completed in August 1864. Its existing broadside guns were replaced with four turrets on a flat deck and the ship was fitted with Template:Convert of armour in a belt around the waterline.<ref name="Barnaby"/> Early ships like Template:USS and Royal Sovereign had little sea-keeping qualities being limited to coastal waters. Coles, in collaboration with Sir Edward James Reed, went on to design and build Template:HMS, the first seagoing warship to carry her guns in turrets. Laid down in 1866 and completed in June 1869, it carried two turrets, although the inclusion of a forecastle and poop deck prevented the guns firing fore and aft.<ref name="Barnaby"/>
American developmentsEdit
The gun turret was independently invented by the Swedish inventor John Ericsson in the United States.<ref name=Sandler>Template:Cite book</ref> Ericsson designed USS Monitor in 1861. Erickson's most prominent design feature was a large cylindrical gun turret mounted amidships above the low-freeboard upper hull, also called the "raft". The raft extended well past the sides of the lower, more traditionally shaped lower hull. A small armoured pilot house was fitted on the upper deck towards the bow, however, its position prevented Monitor from firing her guns straight forward.<ref>Template:Cite book</ref> Template:Efn One of Ericsson's prime goals in designing the ship was to present the smallest possible target to enemy gunfire.<ref name="Thompson">Template:Cite journal</ref>
The turret's rounded shape helped to deflect cannon shot.<ref>Template:Cite book</ref><ref>Template:Cite book</ref> A pair of donkey engines rotated the turret through a set of gears; a full rotation was made in 22.5 seconds during testing on 9 February 1862.<ref name="Thompson"/> This design was technologically inferior to Coles', and made fine control of the turret difficult.<ref name=Sandler/> If turret rotation overshot its mark it was difficult to make a correction. Either the engine would have to be placed in reverse or another full rotation was necessary.
Including the guns, the turret weighed approximately Template:Convert; the entire weight rested on an iron spindle that had to be jacked up using a wedge before the turret could rotate.<ref name="Thompson"/> The spindle was Template:Convert in diameter, which gave it ten times the strength needed in preventing the turret from sliding sideways.<ref>Template:Cite book</ref> When not in use, the turret rested on a brass ring on the deck that was intended to form a watertight seal. In service, however, this proved to leak heavily, despite caulking by the crew.<ref name="Thompson"/> The gap between the turret and the deck proved to be a problem as debris and shell fragments entered the gap and jammed the turrets of several Template:Sclasss, which used the same turret design, during the First Battle of Charleston Harbor in April 1863.<ref>Template:Cite book</ref> Direct hits at the turret with heavy shot also had the potential to bend the spindle, which could also jam the turret.<ref>Template:Cite book</ref><ref>Template:Cite book</ref><ref>Template:Cite book</ref>
The turret was intended to mount a pair of Template:Convert smoothbore Dahlgren guns, but they were not ready in time and Template:Convert guns were substituted.<ref name="Thompson"/> Each gun weighed approximately Template:Convert. MonitorTemplate:'s guns used the standard propellant charge of Template:Convert specified by the 1860 ordnance for targets "distant", "near", and "ordinary", established by the gun's designer Dahlgren himself.<ref>Template:Cite book</ref> They could fire a Template:Convert round shot or shell up to a range of Template:Convert at an elevation of +15°.<ref>Template:Cite book</ref><ref>Lyon, David & Winfield, Rif The Sail and Steam Navy List, all the ships of the Royal Navy 1815-1889, pub Chatham, 2004, Template:ISBN pages 240-2</ref>
CulminationEdit
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Template:HMS of 1871 and Template:HMS of 1872 represented the culmination of this pioneering work. These ironclad turret ships were designed by Edward James Reed. They were also the world's first mastless battleships, built with a central superstructure layout, and became the prototype for all subsequent warships, leading directly to the modern battleship.
Surviving examplesEdit
- The only preserved steam and sail turret ship in Europe is the mid 19th century Dutch ironclad HNLMS Schorpioen.
- The Chilean and Peruvian flagship Huascar is a memorial at Talcahuano.
- A replica of the Chinese battleship Dingyuan was built as a museum ship in 2003.
See alsoEdit
FootnotesEdit
ReferencesEdit
NotesEdit
BibliographyEdit
Template:Ironclad types Template:Warship types of the 19th & 20th centuries