HMS ''Halcyon'' was the lead ship in her class of

minesweeper A minesweeper is a small warship designed to remove or detonate naval mines. Using various mechanisms intended to counter the threat posed by naval mines, minesweepers keep waterways clear for safe shipping. History The earliest known usage of ...

s built for the

Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against F ...

in the 1930s. The vessel was launched on 20 December 1933 and was used as a

convoy A convoy is a group of vehicles, typically motor vehicles or ships, traveling together for mutual support and protection. Often, a convoy is organized with armed defensive support and can help maintain cohesion within a unit. It may also be used ...

escort and during the

landing operations Landing is the last part of a flight, where a flying animal, aircraft, or spacecraft returns to the ground. When the flying object returns to water, the process is called alighting, although it is commonly called "landing", "touchdown" or ...

during the

Invasion of Normandy Operation Overlord was the codename for the Battle of Normandy, the Allied operation that launched the successful invasion of German-occupied Western Europe during World War II. The operation was launched on 6 June 1944 (D-Day) with the Norm ...

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 ship was sold for

scrapping Scrap consists of recyclable materials, usually metals, left over from product manufacturing and consumption, such as parts of vehicles, building supplies, and surplus materials. Unlike waste, scrap has monetary value, especially recovered me ...

in 1950.

Design and description

The ''Halcyon'' class designed as a replacement for the preceding and varied in size and propulsion. ''Halcyon'' displaced at

standard Standard may refer to: Symbols * Colours, standards and guidons, kinds of military signs * Standard (emblem), a type of a large symbol or emblem used for identification Norms, conventions or requirements * Standard (metrology), an object th ...

load and at

deep load 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 ...

. The ship had an

overall length The overall length (OAL) of an ammunition cartridge is a measurement from the base of the brass shell casing to the tip of the bullet, seated into the brass casing. Cartridge overall length, or "COL", is important to safe functioning of reloads in ...

of , 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 draught of . She was powered by two vertical compound-expansion steam engines, each driving one shaft, using steam provided by two

Admiralty three-drum 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, an ...

s. The engines produced a total of and gave a maximum speed of . ''Halcyon'' carried a maximum of 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 ...

that gave her a range of at .Lenton, p. 252 The ship's complement consisted of 80 officers and ratings.Chesneau, p. 63 ''Halcyon'' was armed with two QF 4-inch (10.2 cm) guns; the forward gun was in a high-angle mount while the aft gun was in a low-angle mount. She was also equipped with eight

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) a ...

s. Later in her career, the rear 4-inch gun mount was removed as were most of the .303 machine guns, one quadruple mount for

Vickers .50 machine gun The Vickers .50 machine gun, also known as the 'Vickers .50' was similar to the Vickers machine gun but enlarged to use a larger-calibre round. It saw some use in tanks and other fighting vehicles but was more commonly used as a close-in anti- ...

s was added as were up to four single or twin mounts for

20 mm Oerlikon The Oerlikon 20 mm cannon is a series of autocannons, based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models emplo ...

anti-aircraft gun 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, ...

s. For escort work, her minesweeping gear could be exchanged for around 40

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 ...

s.Chesneau, p. 63; Lenton, p. 252

Construction and career

''Halcyon'' was built by John Brown Shipbuilding & Engineering Company Ltd., at

Clydebank Clydebank ( gd, Bruach Chluaidh) is a town in West Dunbartonshire, Scotland. Situated on the north bank of the River Clyde, it borders the village of Old Kilpatrick (with Bowling, West Dunbartonshire, Bowling and Milton, West Dunbartonshire, Mil ...

, in Scotland. She was laid down on 27 March 1933 and launched on 20 December of the same year. She was commissioned on 18 April 1934. During 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 opposin ...

, ''Halcyon'' served as the lead ship in the 1st Minesweeper Flotilla and saw service during the

Arctic convoys The Arctic convoys of World War II were oceangoing convoys which sailed from the United Kingdom, Iceland, and North America to northern ports in the Soviet Union – primarily Arkhangelsk (Archangel) and Murmansk in Russia. There were 78 convoys ...

, including

Convoy PQ 17 PQ 17 was the code name for an Allied Arctic convoy during the Second World War. On 27 June 1942, the ships sailed from Hvalfjörður, Iceland, for the port of Arkhangelsk in the Soviet Union. The convoy was located by German forces on 1 July, aft ...

in 1942. She also saw service during

Operation Neptune Operation or Operations may refer to: Arts, entertainment and media * ''Operation'' (game), a battery-operated board game that challenges dexterity * Operation (music), a term used in musical set theory * ''Operations'' (magazine), Multi-Man ...

, the naval component of

Operation Overlord Operation Overlord was the codename for the Battle of Normandy, the Allies of World War II, Allied operation that launched the successful invasion of German-occupied Western Front (World War II), Western Europe during World War II. The operat ...

(

D-Day The Normandy landings were the landing operations and associated airborne operations on Tuesday, 6 June 1944 of the Allied invasion of Normandy in Operation Overlord during World War II. Codenamed Operation Neptune and often referred to as D ...

, 1944). ''Halcyon'' was sold for scrapping at

Milford Haven Milford Haven ( cy, Aberdaugleddau, meaning "mouth of the two Rivers Cleddau") is both a town and a community in Pembrokeshire, Wales. It is situated on the north side of the Milford Haven Waterway, an estuary forming a natural harbour that has ...

on 19 April 1950 after 16 years service with the Royal Navy.

References

Bibliography

* * *

External links

HMS Halcyon (J.42)
- uboat.net * http://www.halcyon-class.co.uk/halcyon/hms_halcyon.htm {{DEFAULTSORT:Halcyon (J42) Halcyon-class minesweepers Ships built on the River Clyde 1933 ships World War II minesweepers of the United Kingdom Cold War minesweepers of the United Kingdom