Imperial I-class Star Destroyer/Legends

The Imperial I-class Star Destroyer was a monumental starship designed by Lira Wessex and built by Kuat Drive Yards. They were massive, powerful warships capable of laying waste to entire worlds (provided those worlds did not have planetary shields). The Imperial-class became infamous as the prime enforcer of Imperial rule.

The ship line began development as the Acclamator-class under the Galactic Republic, and evolved before and following the Great Jedi Purge.

It belonged to the Star Destroyer family of warship, exemplified by its dagger/arrowhead design. A single Imperial-class vessel cost the Empire at least 3.88 billion Imperial credits&mdash;the equivalent of several star systems' annual economic output.

This entry covers the definitive version of the type, the Imperial-class Star Destroyer. It was the premier starship class in the Imperial Starfleet. All known variants were 1,609 meters long (approximately one mile) and had three large and four small engines capable of accelerating the ship with a force of several thousand g.

Star Destroyers of this class took part in the three major engagements that towards the end of the Galactic Civil War; the Battle of Yavin, the Battle of Hoth, and the Battle of Endor. A progenitor of the Imperator/Imperial class, the Acclamator-class assault transport, saw service during the early days of the Clone Wars; another progenitor, the Venator-class Star Destroyer, was in use by the war's end.

Crew requirements
According to officially available statistics, Imperial-class Star Destroyers have at least 37,000 officers and crew. Counting the stormtrooper complement (one "division" or "legion", 9,700 men) would total 46,700. This would include a stormtrooper detachment, fighter pilots, and support craft pilots.

When serving as a flagship, 900 additional personnel were stationed onboard. The Star Destroyer could accommodate up to 1,800 passengers.

For those vessels that entered New Republic service, the New Republic reduced the crew requirements by 8,000, to about 28,000 men.

The crew requirements of the Imperial are extraordinarily high. New Republic ships of the closest size tend to have a small fraction of the crew. It is also interesting to note the ISD's high ratio (over 7:1) between full and skeleton complement&mdash;a more usual ratio seems to be 4:1 or 5:1 in large vessels.



Possible reasons include:
 * Large crew requirements enabled ongoing, intensive recruitment
 * Multiple or redundant onboard crews
 * Allowed for easy placement of ISB or COMPNOR agents
 * The ISD's six-year endurance requirement passes a certain limit beyond which maintenance requirements greatly increase; large crews of technicians are thus embarked.
 * Inferior automation compared to that of latter warships, especially those fielded by the New Republic.
 * Multiple shifts, enabling the ISD to be capable of sustaining days of heavy space combat without suffering from crew fatigue.

Bridge tower
The command bridge tower of the Imperial-class Star Destroyer was massive. The command bridge of the ship was much like that of the Executor. The difference between the deck and the ceiling was three to four meters for the command walkways and one and a half meters more for the control pits. The total number of decks on the bridge tower was somewhere between 20 to 30, with the average spacing of 3 meters. At a few areas there were portals that appeared at intervals halfway between the main decks. These corresponded to inhabited chambers, rooms, or shafts spanning more than one level.

Sublight propulsion


For sublight propulsion, the Imperator class relied on an array of three primary ion engines produced by KDY specifically for the vessels. For emergency situations requiring additional thrust, the Imperial-class could use its four Gemon-4 ion engines.

Main battery
The first flight of ships (generally known as the Imperator or Imperial I) possessed a main battery of 12 heavy turbolasers and 4 heavy ion cannon for disabling enemy warships. Those heavy guns were set in twin mounts flanking the tower structure. The second flight of ships, Imperial II-class Star Destroyer (generally known as the Imperial II), possessed a main battery of 64 heavy turbolasers in eight octuple mounts flanking the tower structure. Furthermore, each brim notch in the trench could be fitted with a quadruple heavy turbolaser.

Strangely, the Imperials in either subclass did not choose to give their turrets superfiring ability from a level position, either by superelevating the aft turrets or merely by spacing them out over a longer distance and letting the natural wedge shape provide the ability. Perhaps superelevation proved impossible with the immense recoils involved (official estimates imply yields so great that the momentum of the fired bolts, and the associated recoil, would be comparable to a large asteroid impact), and perhaps spacing the turrets out proved too great a compromise in terms of power distribution.

Secondary weapons
Numerous smaller guns were mounted around the ship to ward off attacks against lesser ships not capable of being targeted by the main battery. They varied in size; some were designed as point-defense cannon to destroy incoming missiles and starfighters while others engaged lesser capital ships. Several examples have been explicitly equipped with proton torpedoes, most notably NRS Emancipator (ex-Accuser) and Chimaera. However, it is not known whether or not they are refit additions.

The Star Destroyer's weapons are designed to make the vessel a long range assault ship. The weapons systems are not very capable of targeting at point-blank range, a weakness exploited by the Rebel fleet at the Battle of Endor.

Axial defense turrets
Three triple-gun turrets were mounted on the ridge of the ship, just forward of the lowest, forwardmost, terrace of the dorsal superstructure.

Hangar defences
Mounted just beyond the forward tip of the attack hangar (see fighter compliment), were two large ventral turbolasers, which sat near the corners of the massive hangar. The primary function of the turbolasers was to defend the vulnerable docking facilities, but could also be used for planetary bombardment.



Power
There were entire planets that, throughout their history, did not expend as much power as an Imperial-class ship did in one hyperspace jump. A massive solar ionization reactor bulged from the ventral spine, annihilating hypermatter as fuel to power the ship.

Fighter compliment
Imperial-class Star Destroyers typically carried a standard Imperial wing of 6 TIE squadrons, for a total of 72 starfighters. The standard wing included one squadron of TIE Interceptors, one squadron of TIE Bombers (lower priority ships had to make do with TIE/gt fighters), one reconnaissance squadron of TIE/rc fighters, and three TIE fighter squadrons. One or two flights in a fighter squadron were TIE/fc fighters. Sometimes, one of the fighter squadrons was used for training purposes. By the Battle of Endor, one of these fighter squadrons had been phased out in favor of a second squadron of TIE Interceptors.

The attack hangar was guarded by a set of armored doors. TIE fighter service and refueling bays, and TIE launch hangars surround the main hangar. TIEs were launched from cycling racks and pilots boarded from overhead gantries and were released into space as they disengaged from the front position in the racks. Returning fighters landed in separate hangars and then were guided by small tractor beams into receiver-carriers. The receivers carried the TIE to a debarkation station where the pilot would exit. Once moved through the transfer tunnels to a launch hangar, the fighter could be serviced and refueled in a separate bay. In the hangar the TIEs were cycled through a launch rack and ready for the next launch.

The small forward hangar was for shuttle craft carrying high-ranking officials. The forward hangar was also used as a back-up to the main hangar.

Ground assault capability
These ships carried 9,700 troops, as well as massive war vehicles such as AT-AT and AT-ST walkers. AT-AT barges and other landing craft were used to deliver ground assault forces to a planet's surface. The Star Destroyer could use its guns and TIE starfighters to support any surface action. If a planet required a lasting presence, a Star Destroyer could quickly deploy a prefabricated garrison base.

Imperial service


Imperial-class Star Destroyers had a distinguished career in the Imperial Starfleet, where they symbolized the Empire's military might (for better or worse). The Imperial-class was known to be in service as early as 19 BBY, a month after the first Empire Day. The second ship of the class was the Exactor, the personal ship of Darth Vader.

According to official records, over 25,000 were eventually procured. Many were destroyed in the fratricidal warfare that consumed the Empire after the death of Emperor Palpatine at Endor while others defected or were captured.

Within Sector-level and many Regional-level fleets, the ISD serves a central role, being the flagship of the unit known as the "Battle Squadron." It has also been observed to operate more or less independently.

More controversial is its role on higher levels. In some reliable records as well as in several others, the ISD was shown to be a mere support ship&mdash; chasing down corvettes and providing escort to Darth Vader's Executor. Arguably it is only fit to be a support ship&mdash; at the Battle of Hoth the Rebellion's heavy ion cannon was able to easily overwhelm a Star Destroyer's shield and disable the ship. At the Battle of Endor, at least one ship was an intermediary between Star Dreadnoughts like Executor and lesser ships like Imperial. Further information also indicates many other types of ships larger than Imperial yet smaller than Executor.

This has led some to conclude that there is a higher level of Fleet than Sectorial and Regional, with the ISD finally able to revert to its role as destroyer and with ships like the Executor taking the role of dreadnought. Others conclude the ships shown in these visual records are either indistinct blops or poorly drawn ISDs, that there are no intermediate ship types between ISD and the Executor and that Executors are an unusual aberration.

Foreign service
This particular class of vessel has seen extensive service in other navies, including that of the successor-state New Republic. The refits implemented by that government appeared to have involved deletion of the quadruple heavy trench guns, installation of proton torpedo launchers and use of a much smaller crew. The ability to embark planetary-assault soldiers appears to have been ignored as well (the Republic choosing to use dedicated troopships). Endurance was reduced from six years to six months; New Republic Defense Force doctrine operates ships on relatively short patrols before returning to base. The Hapan Cluster was able to seize some vessels when the Galactic Empire prepared to abandon their fleet yards near Hapan space.

Despite their stellar qualities, the Imperial-class Star Destroyer, to many, was apparently too much of a symbol of Imperial might. The New Republic chose to procure Mon Calamari Star Cruisers instead; what few Imperial-class Star Destroyers they possessed may have been from defectors or captured. Descendants of the Victory-class Star Destroyer were procured in quantity however; as the Victory was a symbol of the Old Republic's military machine it may have been more politically acceptable.

Private service
One Star Destroyer operated in private hands, the Errant Venture (ex-Virulence), captained by Booster Terrik. It was captured several years after the Battle of Endor but was in poor condition for many years owing to the great cost of maintaining such a large vessel. In addition, she was stripped of the vast majority of her armament: only ten (presumably light) turbolasers were permitted, and even those were not always functional. Years later, she received a comprehensive refit in exchange for use in a New Republic special-operations raid on an Imperial base. The most notable part of this refit was a deep red paint job instead of the classic Imperial white. While Captain Terrik was not permitted to keep all of his weapons after the operation, they were reinstated when the Yuuzhan Vong War occurred. During the Yuuzhan Vong invasion, she served as a temporary Jedi sanctuary and also as squadron flagship. No other private Imperial-class Star Destroyers are known to exist.

Famous Imperial-class Star Destroyers

 * Avenger&mdash;part of Lord Vader's Death Squadron tasked with finding the Millennium Falcon after the Battle of Hoth
 * Basilisk&mdash;part of Admiral Daala's fleet
 * Bellicose&mdash;part of Grand Admiral Thrawn's fleet
 * Chimaera&mdash;flagship of Grand Admiral Thrawn, and later of Grand Admiral Gilad Pellaeon
 * Corrupter&mdash;flagship of Admiral Garreth Holtz
 * Death's Head&mdash;part of Grand Admiral Thrawn's personal armada
 * Devastator&mdash;Lord Vader's flagship prior to the completion of the Super Star Destroyer Executor. This was the ship that intercepted Princess Leia's Tantive IV near Tatooine. Devastator was also part of the Death Squadron, and participated in the Battle of Hoth and the Battle of Endor
 * Emperor's Revenge&mdash;flagship of Carnor Jax; destroyed by Kir Kanos.
 * Errant Venture&mdash;former Virulence, privately owned and operated by Booster Terrik
 * Exactor&mdash;second Imperial-class Star Destroyer ever made, fielded some time after the end of the Clone Wars, while the class was still called Imperator
 * Gorgon&mdash;part of Admiral Daala's fleet
 * Hydra&mdash;part of Admiral Daala's fleet
 * Inexorable&mdash;part of Grand Admiral Thrawn's personal armada
 * Judicator&mdash;part of Grand Admiral Thrawn's personal armada
 * Manticore&mdash;part of Admiral Daala's fleet
 * Mathayus&mdash;commanded by Admiral Coy, later Admiral Dezsetes
 * Nemesis&mdash;part of Grand Admiral Thrawn's personal armada
 * Peremptory&mdash;part of Grand Admiral Thrawn's fleet; destroyed by Dreadnaught-class cruiser of the Katana fleet
 * Relentless&mdash;part of Grand Admiral Thrawn's fleet; survived to be part of the Imperial Remnant's fleet in the Braxant Sector during the Caamas Document Crisis
 * Stalker&mdash;launched the probe droid that landed on sixth planet of the Hoth system and found the hidden Rebel base
 * Steadfast&mdash;part of Carnor Jax's battle fleet under Commander Vivant
 * Stormhawk&mdash;part of Grand Admiral Thrawn's personal armada
 * Tyrannic&mdash;part of Imperial Remnant's fleet during the Caamas Document Crisis
 * Tyrant&mdash;part of Lord Vader's Death Squadron tasked with capturing Rebel ships during the Battle of Hoth; was incapacitated by Rebel ion-cannon fire
 * Vanguard&mdash;flagship of then-Vice Admiral Thrawn

Behind the scenes

 * There has been some disagreement over the name of the class. Early production documentation shows a ship named Imperator, produced at the Gyndine shipyards. However, this ship is much smaller (on the order of 700 meters) than the ship shown in the movies as many designs were greatly upscaled shortly before production began. Some argue that the intent was to have the ship (and class) named Imperator and that "Imperial"&mdash;being the adjective form of "Empire"&mdash;is a rather odd name for a ship. Others argue that the ~700 meter ship represents a distinct class and that Imperial is the true name&mdash; regardless of how silly it may sound&mdash; as it is used in many of the Expanded Universe books. Revenge of the Sith: Incredible Cross Sections eventually put the debate to rest by stating that while the class was originally named Imperator, it was renamed Imperial at some point after the Great Jedi Purge.
 * "Imperator" is Latin and was used as a title for "An army commander in the Roman Republic". Later, during the Roman Empire, it became a title worn by the Emperors and signified "The supreme power of the Roman emperor".
 * Imperial-class Star Destroyers have featured prominently in many Star Wars computer games. However, they have generally been "toned-down" to allow the player some chance of defeating them with a starfighter.
 * Imperial-class Star Destroyers have also been referred to as "cruisers". This is probably due to one of their abilities, which is being able to operate independently and not just as part of a group.

Appearances

 * Dark Lord: The Rise of Darth Vader
 * Star Wars Battlefront II
 * Star Wars: Empire
 * Star Wars: X-wing
 * Star Wars: Rebel Assault
 * Star Wars: Rebel Assault II: The Hidden Empire
 * Star Wars Episode IV: A New Hope
 * The Star Wars Holiday Special
 * ''Star Wars: Rogue Squadron II: Rogue Leader
 * ''Star Wars: Rogue Squadron III: Rebel Strike
 * Empire at War
 * Force Commander
 * Star Wars Episode V: The Empire Strikes Back
 * Star Wars: TIE Fighter
 * Star Wars Episode VI: Return of the Jedi
 * X-wing
 * Star Wars: Jedi Knight: Dark Forces II
 * Tatooine Ghost
 * Thrawn Trilogy
 * Dark Empire
 * Crimson Empire
 * Jedi Academy Trilogy
 * Darksaber
 * The Hand of Thrawn Duology
 * New Jedi Order