Ikazuchi-class Super Dimensional Large Cruiser (SCB)

Ikazuchi-class Super Dimensional Carrier 1

ROBOTECH Technical Files

by Pieter Thomassen and Peter Walker

edited by Tim Wing

Attachments:

  • Ikazuchi-class reference file
  • Ikazuchi-class gallery

Designation: Ikazuchi-class Super Dimensional Large Cruiser (SCB)

Names and disposition:

  • SCB-46 UES Ikazuchi, commissioned in 2036, destroyed over Earth, 2044
  • SCB-47 UES Hood, commissioned in 2037, destroyed over Earth, 2044
  • SCB-48 UES Valiant, commissioned in 2038, destroyed over Earth, 2042
  • SCB-49 UES Lafayette, commissioned in 2038, destroyed over Earth, 2044
  • SCB-50 UES Richelieu, commissioned in 2038, in service
  • SCB-51 UES Grant, commissioned in 2038, destroyed over Earth, 2042
  • SCB-52 UES Bismarck, commissioned in 2038, in service
  • SCB-53 UES De Ruyter, commissioned in 2038, destroyed over Earth, 2042
  • SCB-54 UES Nimitz, commissioned in 2039, destroyed over Earth, 2044
  • SCB-55 UES Scharnhorst, commissioned in 2039, destroyed over Earth, 2044
  • SCB-56 UES Spruance, commissioned in 2039, destroyed over Earth, 2044
  • SCB-57 UES Victorious, commissioned in 2039, destroyed over Earth, 2044
  • SCB-58 UES Roosevelt, commissioned in 2039, missing from extended recon patrol
  • SCB-59 UES Redoutable, commissioned in 2039, destroyed over Earth, 2044
  • SCB-60 UES Indefatigable, commissioned in 2040, in service
  • SCB-61 UES Ark Royal, commissioned in 2040, in service
  • SCB-62 UES Yamato, commissioned in 2040, in service
  • SCB-63 UES Blucher, commissioned in 2040, destroyed over Earth, 2044
  • SCB-64 UES Iron Duke, commissioned in 2040, in service
  • SCB-65 UES Guiseppe Garibaldi, commissioned in 2040, destroyed over Earth, 2044
  • SCB-66 UES Yukikaze, commissioned in 2041, in service
  • SCB-67 UES Bonaventure, commissioned in 2041, destroyed over Earth, 2044
  • SCB-68 UES Dedalo, commissioned in 2042, destroyed over Earth, 2044
  • SCB-69 UES Saratoga, commissioned in 2042, destroyed over Earth, 2044
  • SCB-70 UES Vanguard, commissioned in 2043, in service
  • SCB-71 UES Leonardo da Vinci, commissioned in 2044, in service

These ships were built at the Robotech Factory Satellite and the Robotech Repair Factory. Their names are written with the ‘UES’ prefix.

Ikazuchi-class Super Dimensional Carrier 26Ship’s complement:

  • Ships’ crew (1117 men),
  • One mechanized division (5350 men),
  • Air group (600 men),
  • Life support limits are for a full combat complement and about 800 supernumeraries (7900 men total).

Dimensions:

  • Length: 702 m over all, 608 m excluding engine shielding blades.
  • Height: 177 m over all.
  • Width: 154 m over all.
  • Mass: 1,410,000 metric tons, operational (typical).
  • Fuel Mass: 147,000 metric tons, maximum (typical).

Propulsion systems:

  • Main power system: RRG Mk16 protoculture-fueled Reflex furnace. The powerplant of the Ikazuchi-class vessel can deliver up to 3.38 Petawatts of power, and can operate for seventy-two minutes at maximum power before overheat initiates autoshutdown.
  • Maneuvering Thrusters (8): Fusion-plasma reaction thruster clusters mounted on the bottom, top, and sides of the main hull, halfway to the bow and the stern.
  • Reaction-mass Thrusters (4): Rolls-Royce/P&W SP-25 Fusion-Plasma Reaction Thrusters with protoculture energizer.
  • Secondary Reaction Thrusters (2): Rolls-Royce Kestrel Mk3 Fusion-Plasma Reaction Thrusters with protoculture energizer.
  • Anti-gravity System (1): 27 RRG Titan anti-gravity pods.
  • Space Fold (1): RRG (Robotech Research Group) Mk9 spacefold. This system generates a spherical fold bubble and can transport 30 to 40 subluminal ships in its fold radius.
  • Planetary Capabilities: The Ikazuchi-class has atmospheric capabilities through its reaction thrusters and anti-gravity system. The ships’ structure has sufficient strength to let the ship land; however, any particle gun turrets under the hull would be crushed by the weight and, without previous preparation on the ground, damage to the hangars will occur. Therefore, when landing its troops, the ships are advised to generate a -99% of the local gravity counterforce with their anti-gravity systems. Note that the ground underneath should still be as firm as possible. The ship will float in an ocean, and this is the preferred landing method for extended planetary operations. Unfortunately, the main hangars access doors will be submerged.

Endurance and mobility limits:

The dry stores endurance is 2 years maximum. After that time, the Ikazuchi-class will have to restock its supplies. Water stores are recycled almost completely. The hydroponics installations on board will provide the crew with a reasonable amount of fresh food, but the ship, while far better equipped than the smaller Garfishes, is not completely self-sufficient.

The mecha consumables supplies (missiles mainly) are reasonably extensive, and can sustain continuous combat operations for over twenty days against the Invid. However, a battle against Zentraedi or other forces with a capital ship capability will swiftly drain the stores of anti-ship missiles, as these are not usually carried in very large numbers. The ship launched missile magazines should suffice for two large battles or three or more skirmishes.

The Reflex furnace can function for about 30 years at normal usage levels before an energizer rebuild is necessary.

At full power, the main propulsion systems can produce up to 34.5 Giganewtons of thrust at a minimal reaction mass efficiency profile, or as little as 1.34 Giganewtons of thrust at a maximum efficiency setting. At lower power levels, these thrusts are commensurately smaller.

At full power, the Ikazuchi-class can achieve a maximum delta-v of 204 kps at the cruising acceleration of 0.1 gees, a maximum delta-v of 40.8 kps at the battle acceleration of 1.0 gees, and a delta-v of at most 11.4 kps at the flank acceleration of 2.5 gees. At lower power levels, these ranges are commensurately smaller. Ultra-high efficiency modes will extend the delta-v, but always at the cost of very low accelerations and hence extended travel times.

The fold systems are not navigationally guaranteed for any single jump beyond 10 kiloparsecs (32,600 ly). If longer voyages are required, the ships must conduct multiple fold jumps. These jumps can however be made in quick succession.

The maximum sustained atmospheric speed is limited to subsonic values. During a re-entry, the ship will exceed this, but flight control is sluggish and the speed is always reduced to subsonic speeds as soon as possible. The maximum hover time on the anti-gravity systems is limited only by the protoculture supplies and maintenance requirements.

Weapon systems:Ikazuchi-class Super Dimensional Carrier 20

(As completed):

  • Vickers MP-18 particle gun turrets (8): Designed to counter other ships and to provide orbital fire support, these weapons are capable of delivering 3000 MJ of particle energy once every three seconds at the maximum discharge rate out to an effective range of 300,000 km. These weapons are mounted on the upper main hull.
  • PL-2a Point Defense turrets (8): Mounted in the sides of hull behind movable panels, these close in weapon systems can fire 56 MJ of particle energy four times per second. Typically, these weapons are used against enemy mecha.
  • Mk.253 MLS missile systems (8): This is a VLS missile system. Each system has 10 individual rotating silos which contain 6 missiles each. The missiles are launched through one firing port per silo; and the upper cover of the launcher is armored, thus exposing only one missile per silo directly to enemy fire. The ready magazines under each silo cluster store another 120 missiles, and the magazine can reload the silo launchers while these are in use. The missiles typically used in these launchers are the Warhawk and the Spacehawk. These are usually the standard HE, nuclear reaction anti-warship and nuclear reaction re-entry capable versions.
  • Four launchers are located near the engines, two others near the bridge and the other two are located forward.

(After post-2045 refit):

  • Vickers MP-18 particle gun turrets (14): Designed to counter other ships and to provide orbital support fire, these weapons are capable of delivering 3000 MJ of particle energy once every three seconds at the maximum discharge rate out to an effective range of 300,000 km. These weapons are mounted on the upper main hull (8) and on the lower hull (6).
  • PL-2a Point Defense turrets (32): Mounted in the sides of hull behind movable panels, these close in weapon systems can fire 56 MJ of particle energy four times per second. Typically, these weapons are used against enemy mecha.
  • Mk.253 MLS missile systems (8): This is a VLS missile system. Each system has 10 individual rotating silos which contain 6 missiles each. The missiles are launched through one firing port per silo; and the upper cover of the launcher is armored, thus exposing only one missile per silo directly to enemy fire. The ready magazines under each silo cluster store another 120 missiles, and the magazine can reload the silo launchers while these are in use. The missiles typically used in these launchers are the Warhawk and the Spacehawk. These are usually the standard HE, nuclear reaction anti-warship and nuclear reaction re-entry capable versions.
  • Four launchers are located near the engines, two others near the bridge and the other two are located forward.

Note: all vessels currently in service have received this refit.

Air group and mecha complement:

Ikazuchi-class Super Dimensional Carrier 10Standard air group:

  • 144 VF-6 Alpha fighters in quick-reaction launch bays.
  • 200 additional VF-6 Alpha fighters.
  • 140 fighter-bombers such as the VF-5 Condor and the VF-12 Beta
  • 24 Elint Legioss ESM reconnaissance craft,
  • 2 EC-32 Eyrie AWACS shuttles,
  • 6 SVT-1 Vixen trainers/fast couriers,
  • 4 SC-32 Gossamer heavy personnel and cargo shuttles,
  • 15 RC-4 Rabbit light personnel and cargo shuttles.

Ground forces mecha (if embarked):

  • 210 Destroids (various types),
  • 4500 Cyclones (various types).

Notes: This is a typical complement c. 2043; only 144 Alphas and 72 fighter-bombers are part of the Naval Air Wing, while the other mecha belong to Army/Air Force or Marine units stationed on board. The exact number and type of mecha vary somewhat due to operational realities. About 660 large mecha total is normal, but there is storage and hangar space for 800+ craft. However, this would cause overcrowding in the launch bays.

Prior to mid 2043, no Alpha or Beta Shadow-variants were in active service in the UEEF fleet.

The Cyclone number includes mecha pilot emergency Cyclones, reserves and special forces assignments in addition to the infantry forces.

Electronics:

  • All surviving vessels of this class were fitted in 2043-2044 with ‘Shadow’ protoculture stealth devices and radar absorbing hull covers in the months before their attempts to liberate the Earth from Invid occupation.
  • Some vessels received a Protoculture detector, mounted in a boom on the prow. This sensor was capable of detecting and identifying Invid energizer configurations at distances of over 20 AU. The boom extends 150 meters forward of the bow.

Design notes:

The Ikazuchi-class was developed from the Nergal-class cruisers, which they resemble to a large degree. However, the Ikazuchi-class is larger and more capable overall, as well as more suited to receiving upgrades without undue removal of other systems.

The Ikazuchi series of large cruisers are vaguely rectangular in shape, with a gravity-well attitude that might remind one of a brick flying on its side. The hull narrows considerably in the center, effectively making for an hourglass-silhouette when viewed from the bow or the stern. The four main thrusters are located astern, one on each of the corner-points. The two auxiliary engines are located in sponsons that run along the port and starboard hull, beginning amidships and running along aft until the end of the ship. There is also a command citadel on the upper port side of the vessel, with an observation deck on top of it. Six Alpha launch bays are located on the sides of the ship, capable of launching up to 144 Alphas in battloid mode. The main hangars and their movable blast shield doors are located in the lower amidship levels. The doors cover the exits of three hangar decks and roll toward the stern of the ship when craft are being launched or retrieved. There are also four more secondary hangars with air locks located in the lower nose of the vessel, but these are not capable of rapid launch and are commonly used for shuttles and other non-time critical launch mecha. This gives the Ikazuchi a total of sixteen different hangar bays, which in itself contributes to the ruggedness of the design.

The command citadel houses two command decks, the main hull 12 main decks, though deck 12 is just a small outcropping on the underside of the vessel, usually used as a Horizont shuttle hangar and staging area. The main decks serve the following purposes: deck one is mainly crew and officers’ quarters, and this deck houses the navigation computer and the Astrogator and his mates. Deck two contains crew facilities and the port and starboard launch bays. Deck three consists of the senior officers’ quarters and the engineering block, which includes the hyperspatial communications array, life support, auxiliary gravity control, and quarters for the engineers’ mates. Decks four and seven include much of the quarters and facilities for the crew, as well as the ship’s stores. Decks five and eight are mainly used for the Planetary Forces troops, though there are also cargo holds and crew and officers’ quarters as well. Decks six and nine contain the auxiliary systems, as well as quarters for the Veritech pilots. Decks ten, eleven, and twelve are mainly hangar facilities for the ship’s mecha.

The absence of an extensive point defense capability was the most serious flaw of the pre-refit version of this design. This is even odder when one considers the rather extensive AAA installations on the SDF-1 and 2, and on the Armor series orbital platforms. This lack of attention to anti-mecha operations in the original design would prove to be very costly. The refitted version added no less than 24 additional defensive cannon emplacements, in a brute-force approach to increase the defenses against Invid ramming tactics.

Ikazuchi-class Super Dimensional Carrier 7History:

The Ikazuchi-class became the mainstay of the United Earth Expeditionary Force (UEEF) after it had sent almost all of its older vessels to the Earth, first to combat the Robotech Masters, then in an attempt to liberate the planet from the Invid. In 2032 then the UEEF found themselves depleted both in vessels and in manpower, though they did possess, in the Robotech Satellites, the means to rebuild the fleet. Since the demographic make-up of the UEEF delayed significant reinforcements for almost ten years, the Expeditionary Force design bureau decided not to proceed with emergency construction of the existing Nergal-class cruiser, but to design a new cruiser, incorporating new advances in warship engineering.

The resulting Ikazuchi-class vessels were powerful, well-armed and remarkably nimble for their size, and boasted a formidable complement of Veritech fighters. These ships were well-suited for fighting a war against an enemy like the Zentraedi or the Robotech Masters, and were thought to be effective against the Invid as well. Early battles against Invid outposts discovered closer to the UEEF operations area than Earth appeared to support this. However, these small-scale battles were not a true test for the Ikazuchi’s defenses, as they were not put up against the numerical superiority would be found over Earth. In their defense though, it must be remarked that the true Invid numbers on Earth were an unknown, and had been continuously estimated far lower.

The vulnerability of the Ikazuchi-class was worsened by production problems with the MP-18 particle gun turrets. Although the design was successful, production ran short of its goals. It suffered both from teething troubles and from lower priority for some of the materials, which were diverted into the Izumo and Garfish production lines; this last under the assumption that the Ikazuchi had at least partial armament, but that the Garfish class could not afford to be completed without its single turret. The Izumo class, as the next-generation battlefortresses, received the highest priority, despite their gargantuan size and complexity. As a result, the earlier ships were fitted with only 8 of their 14 designed turrets, and it was not until 2045 that production of the turrets caught up with demands and the vessels at least could receive their full designed armaments.

The weaknesses of the design should have become apparent at the Battle of Kappa Pontis 4, where the UES Valiant stumbled upon a huge Invid outpost, and was unprepared for the sheer numbers of Invid Iigaa she would face. The gun turrets mounted on the dorsal hull were sufficient to destroy the Shell Door-class Invid troop carriers for a while; but new ones arrived at such a rate that enough Iigaa were brought in the battle to pin down the defending fighters, and the dearth of effective point defenses allowed the Invid to break through and cause serious damage to the command bridge and upper decks, which had to be evacuated in the middle of battle. Finally the fighters rallied and saved the battle, but inexplicably no lessons were drawn of this experience.

The result were heavy losses for the Ikazuchi-class in the various attempts to retake the Earth from the Invid in 2042-2044. The surviving ships all received refits which massively increased their point defense capabilities, and later large cruiser designs, the Julius Caesar- and the Eisenhower-classes, corrected this fault in the post-Invid Terran Naval forces, but despite the losses, the Ikazuchi-class ships have rightfully earned their place in military history.

Ikazuchi-class Super Dimensional Carrier 28


 

Robotech (R) is the property of Harmony Gold. Genesis Climber MOSPEADA (R) is the property of Fuji Television, Artmic Studio and Tatsunoko Production. This document is in no way intended to infringe upon their rights.

Original artwork by: Yoshitaka Amano, Shinji Aramaki and Hideki Kakinuma

Acknowledgement is extended to Peter Walker, Pieter Thomassen and Robert Morgenstern of the unofficial Robotech Reference Guide. Peter Walker, Pieter Thomassen and Robert Morgenstern are given credit for all quotes and paraphrasing of the unofficial Robotech Reference Guide that has been utilized in this publication. 

Images from – Art Book Genesis Climber MOSPEADA Complete Art Works (August 2009), Robotech II: The RPG, Robotech Expeditionary Force Field Guide (March 1989)

Content by Pieter Thomassen and Peter Walker, edited by Tim Wing

Copyright © 2001, 2000, 1999, 1997 Robert Morgenstern, Pieter Thomassen, Peter Walke; 2016 Tim Wing

 

 

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