The ''Serrano'' class was a series of six

destroyer In naval terminology, a destroyer is a fast, manoeuvrable, long-endurance warship intended to escort larger vessels in a fleet, convoy or battle group and defend them against powerful short range attackers. They were originally developed in ...

s, built to a British design, which served with the

Chilean Navy The Chilean Navy ( es, Armada de Chile) is the naval warfare service branch of the Chilean Armed Forces. It is under the Ministry of National Defense. Its headquarters are at Edificio Armada de Chile, Valparaiso. History Origins and the Wars ...

from 1928 to 1967. In 1927 Chile ordered the ''Serrano'' class from John I. Thornycroft & Company in the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and North ...

at the cost of £230,000 for each ship to enhance the Chilean Navy's ability to patrol its extensive coastline. The six vessels were completed by 1929. ''Serrano'', ''Orella'' and ''Hyatt'' were equipped for

minelaying A minelayer is any warship, submarine or military aircraft deploying explosive mines. Since World War I the term "minelayer" refers specifically to a naval ship used for deploying naval mines. "Mine planting" was the term for installing controll ...

, and ''Aldea'', ''Riquelme'' and ''Videla'' for

minesweeping Minesweeping is the practice of the removal of explosive naval mines, usually by a specially designed ship called a minesweeper using various measures to either capture or detonate the mines, but sometimes also with an aircraft made for that ...

. Because of weak hull construction the ships had been assessed unsuitable for service along the southern Chilean coast, where it was necessary to use older ships of instead. The destroyers remained in service until the mid-1960s.

Design and description

Due to its longstanding relationship with the United Kingdom and the quality of British

designs at the time, Chile opted for the John I. Thornycroft & Company option in an international competition to build the

new destroyers. The design followed a standard British layout, but was reduced in size and power. The destroyers had 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 were at full load. They were

long overall __NOTOC__ Length overall (LOA, o/a, o.a. or oa) is the maximum length of a vessel's hull measured parallel to the waterline. This length is important while docking the ship. It is the most commonly used way of expressing the size of a ship, an ...

and

between perpendiculars Length between perpendiculars (often abbreviated as p/p, p.p., pp, LPP, LBP or Length BPP) is the length of a ship along the summer load line from the forward surface of the stem, or main bow perpendicular member, to the after surface of the stern ...

with a

beam Beam may refer to: Streams of particles or energy *Light beam, or beam of light, a directional projection of light energy **Laser beam *Particle beam, a stream of charged or neutral particles **Charged particle beam, a spatially localized grou ...

of and a mean draught of . The destroyers were propelled by two

shafts ''Shafts'' was an English feminist magazine produced by Margaret Sibthorp from 1892 until 1899. Initially published weekly and priced at one penny, its themes included votes for women, women's education, and radical attitudes towards vivisection, ...

turned by

Parsons Parsons may refer to: Places In the United States: * Parsons, Kansas, a city * Parsons, Missouri, an unincorporated community * Parsons, Tennessee, a city * Parsons, West Virginia, a town * Camp Parsons, a Boy Scout camp in the state of Washingt ...

-type

geared turbine A steam turbine is a machine that extracts thermal energy from pressurized steam and uses it to do mechanical work on a rotating output shaft. Its modern manifestation was invented by Charles Parsons in 1884. Fabrication of a modern steam turbin ...

s rated at . These in turn were powered by steam from three

Thornycroft boiler Three-drum boilers are a class of water-tube boiler used to generate steam, typically to power ships. They are compact and of high evaporative power, factors that encourage this use. Other boiler designs may be more efficient, although bulkier, a ...

s. The vessels had a maximum speed of and carried of

fuel oil Fuel oil is any of various fractions obtained from the distillation of petroleum (crude oil). Such oils include distillates (the lighter fractions) and residues (the heavier fractions). Fuel oils include heavy fuel oil, marine fuel oil (MFO), bun ...

. They had a complement of 130 officers and ratings. During

sea trial A sea trial is the testing phase of a watercraft (including boats, ships, and submarines). It is also referred to as a " shakedown cruise" by many naval personnel. It is usually the last phase of construction and takes place on open water, and ...

s, all six destroyers exceeded their designed speed by . The ''Serrano'' class was armed with three single /45 calibre guns with half-height

gun shield A U.S. Marine manning an M240 machine gun equipped with a gun shield A gun shield is a flat (or sometimes curved) piece of armor designed to be mounted on a crew-served weapon such as a machine gun, automatic grenade launcher, or artillery piece ...

s. The lack of a fourth gun on the

quarterdeck The quarterdeck is a raised deck behind the main mast of a sailing ship. Traditionally it was where the captain commanded his vessel and where the ship's colours were kept. This led to its use as the main ceremonial and reception area on bo ...

allowed the destroyers to be fitted with

gear. ''Serrano'', ''Orella'' and ''Hyatt'' were fitted for minelaying, while ''Riquelme'', ''Aldea'' and ''Videla'' were fitted for minesweeping. For secondary armament for

anti-aircraft 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 based, ...

(AA) defence, the ''Serrano'' class was fitted with a single /40 AA gun and three machine guns. The destroyers also had two triple-mounted

torpedo tube A torpedo tube is a cylindrical device for launching torpedoes. There are two main types of torpedo tube: underwater tubes fitted to submarines and some surface ships, and deck-mounted units (also referred to as torpedo launchers) installed aboa ...

s for

torpedo A modern torpedo is an underwater ranged weapon launched above or below the water surface, self-propelled towards a target, and with an explosive warhead designed to detonate either on contact with or in proximity to the target. Historically, su ...

es. They were fitted with two

depth charge A depth charge is an anti-submarine warfare (ASW) weapon. It is intended to destroy a submarine by being dropped into the water nearby and detonating, subjecting the target to a powerful and destructive Shock factor, hydraulic shock. Most depth ...

throwers for

anti-submarine warfare Anti-submarine warfare (ASW, or in older form A/S) is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are t ...

(ASW).

Refit

The ''Serrano'' class underwent very little modification during their service lives. In the first 25 years of service, the only changes was the removal of the

mainmast The mast of a sailing vessel is a tall spar, or arrangement of spars, erected more or less vertically on the centre-line of a ship or boat. Its purposes include carrying sails, spars, and derricks, and giving necessary height to a navigation ligh ...

and the addition of single-mounted Oerlikon cannon for AA defence. In the mid-1950s, four of the class were converted to

destroyer escort Destroyer escort (DE) was the United States Navy mid-20th-century classification for a warship designed with the endurance necessary to escort mid-ocean convoys of merchant marine ships. Development of the destroyer escort was promoted by th ...

s and were given

radar Radar is a detection system that uses radio waves to determine the distance (''ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, w ...

on a

tripod mast The tripod mast is a type of mast used on warships from the Edwardian era onwards, replacing the pole mast. Tripod masts are distinctive using two large (usually cylindrical) support columns spread out at angles to brace another (usually vertica ...

and the AA defence was increased to four 20 mm cannon.

Ships

Service history

''Serrano'' and ''Orella'' entered service with the Chilean Navy in 1928, followed by the rest of the class in 1929. The light construction of the vessels made them inadequate for the rough waters off the southern coast of Chile, and

battleship A battleship is a large armored warship with a main battery consisting of large caliber guns. It dominated naval warfare in the late 19th and early 20th centuries. The term ''battleship'' came into use in the late 1880s to describe a type of ...

deployments to that region required that the ''Serrano'' class be left behind and older destroyers provide escort. As Chile remained

neutral Neutral or neutrality may refer to: Mathematics and natural science Biology * Neutral organisms, in ecology, those that obey the unified neutral theory of biodiversity Chemistry and physics * Neutralization (chemistry), a chemical reaction in ...

during

World War II 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 opposin ...

, the service lives of the ''Serrano'' class remained relatively uneventful. Following the war, four of the class, ''Serrano'', ''Hyatt'', ''Orella'' and ''Riquelme'', were converted to destroyer escorts in the mid-1950s. The two unmodified ships, ''Aldea'' and ''Videla'' were decommissioned in 1957 and the four destroyer escorts remained in service until 1962.

Notes

Citations

References

* * {{Chilean destroyers Destroyer classes Chile–United Kingdom relations