Imperial I-class Star Destroyer/Legends

The Imperial-class Star Destroyers (originally called Imperator-class Star Destroyers, designed and built for the Galactic Republic), became infamous as the enforcers of Imperial rule.

They were massive, powerful ships, capable of laying waste to entire worlds (provided those worlds did not have planetary deflector shields). It was generally said to belong to the Star Destroyer family of warship, exemplified by its dagger/arrowhead (or, derisively, cheese-wedge) design.

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

Imperial 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 Star Destroyers have at least 37000 officers and crew. Counting the stormtrooper complement (one "division" or "legion", 9700 men) would total 46700. 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 1800 passengers.

For those vessels that entered New Republic service, the New Republic reduced the crew requirements by 8000, to about 28000 men.

The crew requirements of the Imperator 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 - a more usual ratio seems to be 4:1 or 5:1 in large vessels.

Possible reasons include:
 * Multiple onboard crews
 * 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.

Main battery
The first flight of ships (generally known as the Imperator-I 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 (generally known as the Imperator-II or 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. Several official estimates indicate that each heavy turbolaser possesses more firepower than the combined historical nuclear arsenal of Earth. However, as these numbers have never been directly demonstrated in the past, there is some disagreement as to their validity.



Strangely, the Imperials in either subclass did not choose to give their turrets superfiring ability from a level position, either by superelevating the after 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-Accusor) and  Chimaera. However, it is not known whether or not they are refit additions or not.

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.

Shield or sensor globes
See Super Star Destroyer

Fighter compliment
Each ship carried a wing of 72 Imperial TIE fighters, generally of mixed loadout of space-superiority fighters, bombers and reconnaissance spacecraft. At least one ship, NRS Rebel Dream, featured an enlarged hangar bay, but it is unknown if a greater number of fighters were carried.

Ground assault capability
Several thousand troops were also stationed aboard along with a prefabricated base for rapid subjugation of rebellious territories. The ships also carried massive war vehicles including the AT-ATs and AT-ST walkers. According to some sources, the Imperial Star Destroyer also carried support craft and dropships such as the Y85 Titan Dropship and the Sentinel-class Landing Craft. The ship could also use TIE Fighters and orbital bombardment to support any surface action.

Imperial service
Imperial Star Destroyers had a distinguished career in the Imperial Starfleet, where they symbolized the Empire's military might (for better or worse). According to official records, over 24,000 were procured; some argue for lesser (or much greater) numbers. Some estimates range as high as 180,000 ships. 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 the 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 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 lead to 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 in Hapan space.

Despite their stellar qualities, the Imperial 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 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 operates 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 invasion occurred. During the Vong invasion, she served as a temporary Jedi sanctuary and also as squadron flagship. No other private Star Destroyers are known to exist.

Famous Star Destroyers

 * Avenger - part of Lord Vader's Death Squadron tasked with finding the Millennium Falcon after the Battle of Hoth
 * Bellicose - part of Grand Admiral Thrawn's fleet
 * Chimaera - flagship of Grand Admiral Thrawn, and later of Grand Admiral Gilad Pellaeon
 * Corrupter - flagship of Admiral Garreth Holtz
 * Death's Head - part of Grand Admiral Thrawn's personal armada
 * Devastator - Lord Vader's flagship prior to the completion of the Star Dreadnought Executor. This is 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
 * Inexorable - part of Grand Admiral Thrawn's personal armada
 * Judicator - part of Grand Admiral Thrawn's personal armada
 * Mathayus - commanded by Admiral Coy, later Admiral Dezsetes
 * Nemesis - part of Grand Admiral Thrawn's personal armada
 * Peremptory - part of Grand Admiral Thrawn's fleet; destroyed by Dreadnaught-class cruiser of the Katana fleet
 * Relentless - 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 - launched the probe droid that landed on sixth planet of the Hoth system and found the hidden Rebel base
 * Stormhawk - part of Grand Admiral Thrawn's personal armada
 * Tyrannic - part of Imperial Remnant's fleet during the Caamas Document Crisis
 * Tyrant - 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 - 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. The Star Wars Incredible Cross Sections: Episode III 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 Jedi Purge.


 * The RPG has also made a statistic set for the two subclasses, but they seem highly inaccurate in both numbers and magnitude when compared to the film - the highest canon.


 * 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.

Appearances

 * Star Wars Empire: Betrayal (TPB)
 * Star Wars:X-wing
 * Star Wars: Rebel Assault
 * Star Wars Episode IV: A New Hope
 * ''Rogue Squadron II: Rogue Leader
 * ''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: Isard's Revenge
 * Star Wars:Jedi Knight: Dark Forces II
 * Tatooine Ghost
 * Heir to the Empire
 * Dark Force Rising
 * The Last Command
 * Dark Empire
 * Jedi Search
 * Dark Apprentice
 * Champions of the Force
 * Darksaber
 * Force Heretic I: Remnant
 * Star Wars Battlefront II