Imperial Navy

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Imperial Navy

While the Imperial Guard is responsible for the Imperium's ground forces, the Imperial Navy is responsible for the fleets of starships that maintain order between the stars and planets in the Imperium, as well as engaging threats both inside and outside the Imperium's borders.

The Birth of the Imperial Navy
During the Great Crusade, both the Guard and Navy were originally a single organisation; the Imperial Army. Each formation of the Imperial Army was assigned a cruiser-size vessel to act as a transport and mobile base, which was usually accompanied by several escorts. Commanding Officers held command over both their regiment and the starships assigned to them.
The events of the Horus Heresy caused a rethink of military organisation that, among many things, split the Army into the Guard and the Navy, so that no one commander could control both an army and the means to transport that army across space. This makes rebellions easier to contain.

Ships of the Imperial Navy
Fleets of the Imperial Navy are made up of multiple vessels that can be divided into three broad categories; battleships and grand cruisers, cruisers, and escorts.

Battleships are huge starships, with enormous amounts of weapons and shields, and usually serve as the flagship for the Admiral of the Fleet, though this is not always necessarily the case. Although very powerful, battleships are slow to manoeuvre. The Emperor and more recent Retribution class battleships are by far the most common in the Imperial Navy. Imperial battleships can have crews of 30,000 or more, including large numbers of Imperial Navy Armsmen to defend against enemy boarding assaults. Battleships can be up to 8 kilometres from prow to stern and displace millions of tons. Because they represent such a vast expenditure of resources and require a fairly advanced technical base, these are typically constructed only in the largest shipyards above the major Adeptus Mechanicus forge worlds. These vessels are precious assets and are carefully husbanded, usually employed in only larger fleet formations.
The quality of living quarters on these large battleships varies from vast luxurious staterooms with wardrobes and bathrooms of such decadence they rival that of the palaces Planetary Governors and often include harems of Handmaidens, for the officers of the highest ranks (Admiral, First Officers),
While Petty Officers would have quarters of reasonable grandeur and comfort,
Down to the lowest Ratings who have little more than a flea-infested bunk and a single toilet to share with 10 other Ratings.

Grand Cruisers are smaller than battleships, yet larger than cruisers. These vessels are usually much older in design and do not incorporate many of the features that are typical in current Imperial Navy vessels, like the armoured prow, and are not quite compatible with current navy tactical doctrine. As such, many are retired from active duty, but are still used by reserve fleets. There are also some modernized versions of Grand Cruisers in service, but since these are much larger and more heavily-armed than their predecessors, they are more often classed as battleships. These kinds of vessels are usually purpose-built or modified from the recovered hulks of battlecruiser hulls and are not commonly encountered in the Imperial Navy.

Cruisers make up the majority of an Imperial Navy fleet. Though not as powerful as a battleship, cruisers are much faster and can still deliver a deadly blow. There are multiple classes of cruiser; most based on the same general hull design but incorporating different combinations of weapon systems and void-capable fighters and bombers. Large cruisers - those which are over 3 kilometres long - can carry a crew complement of over 10,000, plus Imperial Navy Armsmen and military police squads. While cruisers are still particularly complex, it is not uncommon for them to be constructed on smaller forge worlds or any civilized world that has a shipyard suitable for constructing vessels of their size.

There are also classes of Battlecruisers. Although based on a hull-design that is similar to the regular cruisers, these ships are generally somewhat larger and more heavily armed, incorporating more advanced power distribution systems capable of supporting battleship-grade weaponry in a cruiser hull.

A subset of the cruiser category is the light Cruiser. These ships fall in size between cruisers and escorts, mixing the firepower and durability of cruisers with the speed and manoeuvrability comparable to that of escort ships. The Dauntless is a very common light cruiser class in the Imperial Navy. Extremely self-sufficient, it is fast and has enough firepower to be a threat to both escorts and capital ships. There are other classes in common use in the Imperial Navy, most notably the Endeavour class, which serves in varied forms and hull types throughout the Imperium. Light cruisers are a fairly common ship class, as they are relatively simple to construct for being a capital ship, and they are uniquely suited for reconnaissance patrols and for making a presence where their speed and maneuverability are an advantage, and where having a larger number of smaller hulls allows the Navy to monitor a wider area of space. Light cruisers have, on many occasions, brought word of approaching enemy fleets and allowed for an advance warning that saved the populations of numerous systems in hostile areas of the Imperium.

Escort ships are the smallest type of ship in the Imperial Navy fleets, found in two distinct sub-classes. The larger of the two are frigates, which are better armed and more heavily armored. Destroyers are generally smaller, but they are by far the fastest and most maneuverable interstellar warships employed by the Imperial Navy. They are usually organized in squadrons of 2 to 6 vessels and will always operate as a group. The main task of the escort ships is to serve as a screen for capital ships against enemy torpedoes and attack craft so that they can get into position more quickly and safely. They are also employed behind the gun line to finish off enemy cruisers that have been damaged so that the larger vessels can concentrate on the most important threats in an enemy formation. Escort ships are normally not more than 1 kilometer in length, with destroyers generally being only six to eight hundred metres from prow to stern.

Imperial Fleets
Every ship of the Imperial Navy is assigned to one of the five Segmenta of the Imperium, Solar, Obscuras, Pacificus, Tempestus and Ultima, and falls under the command of the respective Lord High Admiral.
In turn, each Segmentum is divided into 'sectors', regions of space that are generally cube-shaped and contain 8 million cubic light years of space. These sectors contain multiple sub-sectors, collections of star systems no more than twenty light years in radius. The ships of each Segmentum are divided amongst the sectors. These Battlefleets are assigned the task of safeguarding the sector they are assigned to but are occasionally deployed to another sector to combat exceptional threats, each Battlefleet is generally named after the sector it is assigned to.
Each Battlefleet is assigned a number of cruisers and battleships, usually between fifty and seventy-five vessels. The Battlefleets are also assigned multiple escort squadrons, and is also in command of a large number of transports, messenger craft, orbital defences, space platforms and system patrol vessels. The ships of a Battlefleet must constantly patrol their sector and fulfil a variety of roles; protect merchant shipping from pirates, transport Imperial Guard regiments to warzones, escort Adeptus Mechanicus Explorator fleets and provide orbital support for invading or defending armies.
Because of the vast space that requires policing, the Battlefleet is normally split into detachments consisting of one or two cruisers, accompanied by a squadron of escorts. If a particular situation is more than a detachment can handle, additional detachments are called in to reinforce.
On occasion, a Battlefleet can be formed to operate in a smaller area. Battlefleet Armageddon is assigned solely to the Armageddon sub-sector, and, prior to the Third War for Armageddon, was made up of four battleships, twenty-seven cruisers and thirty six squadrons of escorts. Battlefleet Solar is assigned specifically to the Sol System, and is primarily charged with defending the two holy worlds of Terra and Mars.

Source:Wikipedia

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Design features of Imperial Navy vessels

Offensive Weaponry
Weapons Batteries usually are the primary armament for most warships. Since each battery consist of numerous ranks of individual weapons, whole sections of the ship's hull can be covered by gun ports, launcher systems, turrets and weapon housings. The weapons employed vary immensely: plasma projectors, close-range missile launchers, laser cannons, rail guns, fusion beamers and graviton pulsars have been found on Imperial ships. These batteries fire in co-ordinated salvoes, to increase the chances to hit and amount of damage done to a target.

Lances are energy weapons of extreme power. Usually mounted in large and heavily armoured turrets, lances use triple or even quad energy projectors to focus its energy into a concentrated beam, capable of burning through even the most armoured hull and cutting smaller vessels in half.
Torpedoes are long range missiles carried by many Imperial Navy vessels. From sixty to two hundred metres in length, these weapons are powered by a plasma reactor which also doubles as its warhead. Once launched, the plasma drive propels the torpedo towards its target, whilst starting an energy build-up that will detonate the projectile once it reaches its target. Most torpedoes only have limited detection capabilities and will not track and engage its target unless its passes within a few thousand kilometres of the target vessel. Unlike weapons batteries and lances, torpedoes cannot be deflected by a ship's shields - the sheer size of the warhead enables them to plough through even the most powerful energy barrier with ease.
Nova Cannons are huge weapons. Normally mounted in the prow of the ship so that the ship's engines can compensate for the recoil, these guns use gravimetric impellers to propel a projectile close to the speed of light. After reaching a preset distance, the projectile implodes with a force potent enough to cripple most vessels and/or damage several at once. The largest Imperial battleships are known to mount Nova Cannons so monstrously powerful that they are able to devastate entire enemy fleets in a single salvo.

Defensive systems
Every Navy vessel is covered with defensive turrets designed specifically to destroy incoming bombers and torpedoes.
Shields are protective energy barriers that allow ships to survive the hostile environment that is space. Shields form an invisible band of energy around the vessel, a variable layer of force that can absorb radiation, interstellar dust, particle showers and weapons hits. Shields have a maximum tolerance and can be overloaded by sustained fire, forcing the generators to shut down to vent off excess energy.
Every spacefaring vessel is equipped with a certain amount of armour, capable of deflecting impacts on the ships' hull. The strength and thickness of the armour varies depending on the ship's size and type - a tiny escort ship will have a ribbed outer hull maybe a foot thick or less, while an 8-kilometre-long Imperial battleship will have three separate, heavily reinforced adamantium hull layers, with a total thickness of over 10 metres. Typical among modern ships of the Imperial Navy is the armoured prow, which is massively reinforced and can be hundreds of feet thick on the largest ships as it is also used as a ram prow. It is capable of deflecting all but the most powerful of frontal hits.

Propulsion systems
Every Imperial ship is equipped with a plasma drive for normal propulsion through the depths of space. Running up to a third of the ship's length, the aft section is a mass of drive tubes, engine compartments and plasma reactors.
Most Navy ships employ warp drives to breach the barrier that separates realspace from the Immaterium and allow for interstellar travel. Implosion of these drives can lead to the creation of a warp rift.

Fighter Squadrons

Many Imperial Navy capital starships are capable of carrying starfighter squadrons. These are used in a variety of roles, from small fighters providing defence against torpedo attacks, to heavy bombers packing anti-ship ordnance. The largest battleships and heavy cruisers are known to have launch bay capacities of up to 2000 fighter craft, bombers and dropships.

The Fury Interceptor is the most common starfighter used by the Imperial Navy for space combat. With some variants reaching 60 to 70 metres in length, the Fury is significantly larger than most atmospheric fighters, and carries a pilot, navigator and gunner. On occasion, an Astropath psyker will also be aboard, to provide greater communications capability. The Fury's reinforced hull contains an extensive network of circuitry and life-support systems, and even has a small chemical toilet and sleeping compartment for the crew. Furies are normally equipped with multiple forward-firing banks of lascannons and anti-starfighter missiles.

Starhawk bombers are larger, slower craft, designed to carry a heavy payload of plasma bombs and armour piercing missiles, for use against enemy capital ships. Crewed by a pilot, co-pilot, tech-priest (plus acolytes), various turret gunners and a logistics officer, a standard Starhawk features limited sleeping quarters, chemical toilets and even an automated medical unit inside its hull. Armed with a multitude of short-range turret-mounted defence weapons, used to fend off enemy starfighters, a lone Starhawk can wreak havoc among enemy fighter squadrons before swooping in to deliver a crippling missile strike on an enemy capital ship. On rare occasions, Starhawks can be modified to carry and launch a very small number of anti-starship torpedoes.

Atmospheric Aircraft
As part of the post-Heresy reorganisation, all aviation capability was assigned to the Imperial Navy. No Imperial Guard regiment (with the exception of the Phantine Air Corps and Elysian Drop Troops) has access to atmospheric fightercraft, and the assistance of the Imperial Navy is required when air support is needed for a campaign.

For atmospheric fighter combat, the two workhorses of the Imperial Navy are the Lightning strike fighters and the Thunderbolt heavy fighter . The Lightning is the faster and more maneuverable of the two, but cannot carry as many weapons as the Thunderbolt, and are considerably lighter armoured. Lightnings are often used as reconnaissance aircraft and interceptors, while Thunderbolts are mainly assigned to an air superiority role. Both are equipped with vector-thrust capability.

Marauder bombers are huge aircraft, capable of carrying two thousand kilograms of ordnance. Each Marauder possesses a massive bomb bay, along with a pair of lascannons and two pairs of heavy bolters for defense against enemy fighters. Marauders were the Imperial Navy's original space-borne bomber craft before their replacement by the equally large, but more advanced and heavily armed, Starhawk bomber class The Marauder is also equipped with vector-thrust.
For close support, the Imperial Navy has access to Valkyrie transports, and the Vulture gunship. These aircraft are not true flight craft, instead using vectored thrust to travel quickly at low altitudes.

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