Imperial I - class Star Destroyer / Legends The Imperial I " - class Star Destroyer , also known as the Imperial I " - class Destroyer or the " Imperator " - class Star Destroyer , was an iconic class of warships designed by Lira Wessex and built by Kuat Drive Yards . The " Imperial " - class Star Destroyers , along with Imperial stormtroopers , represented the might of the Imperial Military throughout the galaxy during the reign of the Galactic Empire . The " Imperator " - class was originally used by the Republic Navy toward the end of the Clone Wars , and served alongside the " Tector " - class in a few task forces during the conflict . It was at the time one of the largest warship classes in the Republic Navy . It later became a mainstay of the Imperial Navy and was also fielded to a lesser degree by the Empire ' s successor - states . Characteristics . Cost . The " Imperial I " - class belonged to the Star Destroyer family of warship , exemplified by its dagger / arrowhead design . A single " Imperial " - class vessel cost the Empire more than twenty times the cost of a EF76 Nebulon - B escort frigate , which was the equivalent of several star systems ' annual economic output . Dimensions . The " Imperial " - class was produced in large numbers and was the premier warship class of the Galactic Empire . All known variants were 1 , 600 meters long ( one mile ) . Compared to most common frigates and downscaled cruisers known from the days of the Old Republic , the " Imperial " - class was a huge warship , but in the Imperial Navy , it was one of the Empire ' s mid - sized mainline warships , like its predecessor had been for the Republic . The hulls of the " Imperial " - class were painted in Star Destroyer White , a purely economic choice as it was the only variety of paint that was produced in sufficient quantities to coat the Empire ' s immense number of warships . Crew requirements . According to officially available statistics , " Imperial " - class Star Destroyers had 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 , starfighter pilots , and support craft pilots . Differing from many other Imperial vessels , recreational facilities provided entertainment for off - duty personnel and " guest rooms ' could accommodate Imperial VIPs . Offensive and defensive systems . The " Imperial I " - class Star Destroyer possessed a main battery of six heavy turbolasers and two heavy ion cannons , arranged in four dual mounts flanking the ship ' s tower structure . Like with several other Star Destroyer classes , the designers did not take advantage of their wedge shape to give the heavy cannons the ability to focus on targets in the forward firing arc that were level with the ship . This could have been accomplished either by superelevating the aft turrets , or merely by spacing the turrets apart over a longer distance of the ship ' s length . In any case , this Star Destroyer class could bring all its heavy guns to bear by dipping its bow downward . Numerous smaller and medium 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 . Some ships , such as " Emancipator " , were refitted with proton torpedo launchers . Three triple - gun turrets were mounted on the ridge of the ship , just forward of the lowest , forwardmost terrace of the dorsal superstructure . Mounted just beyond the forward tip of the attack hangar ( see fighter complement ) , were two large ventral turbolasers , which sat near the corners of the massive hangar . Complement . " Imperial " - class Star Destroyers typically carried a standard Imperial wing of 6 TIE squadrons , for a total of 72 starfighters . The standard wing included four TIE Fighter squadrons ( one squadron often referred to be a reconnaissance squadron of TIE / rc starfighter s ) , one squadron of TIE Interceptors , one squadron of TIE Bombers ( lower priority ships had to make do with TIE / gt starfighter - bombers ) . Often one or two flights in a fighter squadron were TIE / fc starfighter s . 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 located on the underside on the ship and was guarded by a set of armored doors . TIE fighter service and refueling bays , and TIE launch hangars surrounded 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 . 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 . Although larger landing craft could only be carried onboard bigger Imperial vessels , the " Imperial " - class could transfer a large number of heavy walkers to smaller transport ships via a detachable rail system . 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 . Like most other Star Destroyer models , the " Imperial " - class was capable of entering atmospheres and supporting ground operations directly . Propulsion systems . There were entire planets that , throughout their history , did not expend as much power as an " Imperial " - class ship did in one hyperspace jump . The hyperspace generator was located along the ship ' s ventral surface . A massive solar ionization reactor bulged from the ventral spine , annihilating hypermatter as fuel to power the ship . Auxiliary reactors flanked the main reactor and the three reactors were connected to the three main engines . In addition , the backup engines were connected to additional reactors as well . Catastrophic release braces were located underneath the ventral reactor bulge , in case of emergencies where the core of the main reactor had to be ejected from the ship . As designed , the " Imperial " - class had a Class 2 hyperdrive with a Class 8 emergency backup . However , KDY ' s practice of subcontracting out the design to meet Imperial demands led to occasional design quirks : Star Destroyers built by the Corellian Engineering Corporation were considerably faster , both at sublight and hyperspace speeds . For sublight propulsion , the " Imperial " - class relied on an array of three primary Destroyer - I 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 . The engines were capable of accelerating the ship with a force of several thousand g . Bridge tower . The command bridge tower of the " Imperial " - class Star Destroyer was massive , and the command bridge followed a design similar to that of many other KDY warship classes , such as the " Venator " - class and the " Executor " - class designs . The sensor array on top of the Mk . I ' s tower had support beams running diagonally across it . These would later be substituted for vertical ones during a minor refit , which made the array look similar to the one on Mk . II vessels . The two globes atop the bridge tower served two purposes : aiding both in hyperspace communication and deflector shield generation . The proximity of the deflector shield generators made the bridge tower one of the most protected parts of the Star Destroyer History . Republic origin . The " Imperator " - class was designed as a massive , powerful , mid - sized warship , and appeared in limited numbers during the Clone Wars , where it served in several Republic task forces . As the war neared its end in 19 BBY , the production lines of new " Imperator " - class and " Tector " - class destroyers expanded , while the lines for the older , lighter " Venator " - class slowed down . The first vessel was named the " Executrix " , while the second was the " Exactor " , which later served as the first personal flagship of the Imperial enforcer Darth Vader . There was also an " Imperator " among the Mk . I models , sharing the class name . Following the Great Jedi Purge and the establishment of the Galactic Empire in 19 BBY , the " Imperator " model was renamed " Imperial " - class and production of the class was increased even further and refined . Despite the name change , some Imperial documents continued to use the original name to identify the class . 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 ) . Eventually , these Star Destroyers rendered older vessels , like the " Venator " - class , obsolete . 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 , and even served as a small , peacekeeping battleship . According to official records , over 25 , 000 were eventually produced . The Navy ' s immense demand for Star Destroyers led Kuat Drive Yards to subcontract the design out to various other shipwrights , which occasionally led to a number of design quirks : Star Destroyers built by the Corellian Engineering Corporation were considered the fastest ships in the Imperial Navy , both at sublight and hyperspace speeds . Many Star Destroyers were destroyed in the fratricidal warfare that consumed the Empire after the death of Emperor Palpatine at Endor in 4 ABY , while others defected or were captured over the years . Within sector - level fleets , the " Imperial " - class Star Destroyer served a central battleship role , being the flagship of the unit known as the " Battle Squadron . " A Sector Group was responsible for patrolling a given sector and comprised 24 Star Destroyers . It was also observed to operate more or less independently and often far from support ships and facilities . Through many operations , the " Imperial " - class functioned as a destroyer , a capital ship fast enough to chase down blockade runner s and protect fleets . As an escort , it also supported Imperial Star Cruisers and Star Dreadnoughts in fleet combat . When he assaulted Hoth , Darth Vader commanded the Star Dreadnought " Executor " and brought along a flotilla of " Imperial " - class vessels from Death Squadron to assault the planet . The Rebellion ' s heavy ion cannon , powered by the reactor of a battlecruiser , easily overwhelmed individual Star Destroyer shields and rapidly disabled ships in orbit . In the New Republic era , " Imperial " - class Star Destroyers continued in the escort role for larger vessels in campaigns like Operation Shadow Hand in 10 ABY . The Super Star Destroyer " Allegiance " led a task force of " Imperial " - class ships and World Devastator s during the First Battle of Mon Calamari . This was one of many fleets that struck out from the Core as part of the operation , which was aimed at taking back most of the Galactic Empire ' s former territories . Operation Shadow Hand saw a relatively heavy use of different types of Super Star Destroyers supported by Star Destroyers . However , due to lack of logistics , not all Imperial splinter factions made use of Super Star Destroyers . For instance , Grand Admiral Thrawn massed a sizable force in 9 ABY , but could not obtain any larger warships . In those instances , Star Destroyers like the " Imperial " - class acted as main command ships of a navy . Later service . This particular class of vessel saw extensive service in other navies , including that of the successor - states the New Republic and the Galactic Alliance . Some New Republic " Imperial I " - class Star Destroyers , like the " Mon Mothma " , were refitted to include gravity well projectors . Private service . One Star Destroyer was operated by a private individual — the " Errant Venture " , formerly the " Virulence " , which had been captained by the smuggler Booster Terrik . The warship was claimed by Booster in the wake of the decisive Battle of Thyferra that concluded the Bacta War , 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 turbolasers were permitted , and even those were not always functional . Years later , the vessel received a comprehensive refit in exchange for Booster permitting its 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 . Variants . " Imperial II " - class Star Destroyer . Several variant designs and refits were made using the " Imperial " - class as a basis . The most famous and widely produced , was the " Imperial II " - class Star Destroyer , the second iteration of the class . It included improved armor and weaponry , a different sensor tower and other cosmetic differences . " Imperial " - class variant . Similar to how some " Victory " - class vessels borrowed design elements from the " Imperial " - class , at least one " Imperial " variant borrowed elements of the " Victory " - class . It had an elongated command tower and wing - structures on the side of the superstructure . " Interdictor " - class Star Destroyer . Another variant was the " Interdictor " - class Star Destroyer , heavily modified " Imperial " - class ships that were fitted with gravity - well generators and utilized to halt hyperspace travel for enemy ships . Behind the scenes . There has been some disagreement over the name of the class . Early material by Geoffrey Mandel , now considered unofficial , showed the Star Destroyer model smaller than they later appeared . The class name " Imperator " was used for these drawings , and the ships were to be produced at the Gyndine shipyards . Many of the designs were greatly upscaled shortly before production began . " " put the debate to rest , by clarifying the issue : while the class was originally named " Imperator " , it was renamed " Imperial " at some point after the Great Jedi Purge . Later sources would reference " Imperator " , including the novel " " and the Expanded Universe section on the " Venator " - class Star Destroyer ' s profile in the original Databank . The word " " is 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 . " It also acted as the direct namesake for the term Emperor , as the latter term was the Old French spelling for the aforementioned term . Some critics suggest that naming one of the Empire ' s class of ships " Imperial " is redundant . Based on an animatic of a " " TV spot , an " Imperator " - class Star Destroyer was scheduled to appear during the final scenes of the film , but was apparently cut and replaced with a " Venator " - class in post - production . " Imperial " - class Star Destroyers have featured prominently in many " Star Wars " computer games . However , they have generally been weakened to allow the player some chance of defeating them with a starfighter . Some of these game mechanics have included shooting sensor globes and reactor bulbs to bring down the whole ship . " Imperial " - class Star Destroyers have sometimes been referred to as cruisers . The book " Starships of the Galaxy " ( Saga Edition ) referred to most common Star Destroyers as being classified as " star cruisers , " with lowercase letters . It also noted that unlike the term " Star Destroyer , " " star cruiser " means " a naval cruiser that travels through space . " Since the " Imperial " - class has also been called a " star destroyer , " the class can be seen as either a naval destroyer or a cruiser , given similarities in their roles . " Imperial " - class ships have also been described as battleships ( more specifically , " peacekeeping battleships " ) . This is presumably because one " Imperial " constituted a line on its own . " Revenge of the Sith Incredible Cross - Sections " also mentions warships being " downscaled , " depicting at least two separate classification systems , one where regular Star Destroyers are destroyers and another where they are battleships . Numerous Expanded Universe sources state that the " Imperial I " is armed with 60 identical turbolasers and 60 identical ion cannons . However , analysis of the Star Destroyer models used in the films shows that this is a flawed description . The " " book followed the movie model more closely , describing three twin - barreled heavy turbolasers and one ion cannon on each side of the command tower , one quad - laser cannon in each side trench , three cannons in front of the terrace superstructure , and numerous smaller guns lining each trench , as well as several tractor - beam projectors located inside the vessel . The " Star Wars Technical Journal " offers a slightly different number for the crew requirement : 4 , 520 officers and 32 , 565 enlisted men making a total crew of 37 , 085 .