Vickers-Chrysler ADR-04 Mk. X Defender Air Defense Robot

ADR-04 Mk X 1ROBOTECH Technical Files

by Pieter Thomassen and Peter Walker, with Robert Morgenstern

edited by Tim Wing


  • ADR-04 Defender reference file
  • ADR-04 Defender gallery

Designation: Vickers-Chrysler Robotech Systems Inc. ADR-04 Defender Air Defense Robot.

I. Dimensions:

  • Total Height: 10.7 meters
  • Total Depth: 4.3 meters
  • Total Breadth: 8.6 meters
  • Weight: 21.7 metric tons (dry), 27.1 metric tons (fully loaded).

II. Type:

  • Design: Vickers plc and Chrysler Defense
  • Builders: Vickers plc and Chrysler Defense; later by Vickers-Chrysler Robotech Systems Inc.

Series sub-types:

  • R-04 Mk. I: Proof-of-concept mecha for the leg assembly.
  • ADR-04 Mk. III: One man all-weather anti-aircraft air defense robot, prototype for the Mk. X Defender.
  • ADR-04 Mk. X Defender: One man all-weather anti-aircraft air defense robot.
  • ADR-04 Mk. XI Defender: One man all-weather anti-aircraft air defense robot, laser armed Defender variant.
  • LDR-04 Mk. XVI Maverick: One man all-weather long range air defense robot.

III. Service History:

  • R-04 Mk. I: Three produced, 2006.
  • ADR-04 Mk. III: Four produced, 2007.
  • ADR-04 Mk. X Defender: Served with the UN Spacy from March 2009 until 2017, and with the UEDF Tactical Corps and Civil Defense Corps from 2018 until 2025.
  • ADR-04 Mk. XI Defender: Served with the UN Spacy from 2010 until 2017, with the UEDF Tactical Corps and Tactical Space Corps from 2018 until 2027, and with the UEEF from 2018 until 2026.
  • LDR-04 Mk. XVI Maverick: Served with UEDF Tactical Corps and Civil Defense Corps from 2019 until 2029.

IV. Propulsion:


  • 1 x Krauss-Maffei Wegmann GmbH MT828 miniaturized protoculture-cell energizer.
  • 8 x standard cannisters of protoculture.

Auxiliary power unit:

  • General Electric EM10T hydrogen/oxygen fuel cell, 510 kW for twelve hours.

Thrusters for space maneuvering (actually fitted only in the Spacy destroids):


  • 2 x Rocketdyne AST-04 dual thruster banks on the back, total thrust 14 kN with a fuel supply sufficient for a total delta-v of approximately 0.2 kps.

(attitude control)

  • 14 x Nakajima NBS-1 high-thrust vernier thrusters, located on the heels (4), calves (2), forward waist (2), chest (2) and on the shoulders (4).
  • 2 x P&W LHP04 low-thrust vernier thrusters, located to either side of the radar tower.

V. Performance:

  • Maximum speed: 54 kph (fully loaded).
  • Protoculture endurance: an average of 475 hours (Mk. X) or 90 (Mk. XI) operational use.

ADR-04 Mk X 5VI. Electronics:

Radar System:

  • Hughes APG-198 short range (45 km) X band pulse Doppler phased array, multi-mode radar with battlefield surveillance, short distance air search and fire control modes.
  • Thomson PA-3 long range (>100 km) X band pulse Doppler phased array air search radar.

Optical tracking:

  • Thomson DOS-2006 multi-band digital camera system, for medium range spherical UV, infra-red imaging and optical band detection and tracking.
  • Thomson LT-3 multi-frequency laser ranger and designator.
  • Zeiss TS-2 long range telescopic array for the visible/IR spectrum.
  • Hollandse Signaal BigEye broad-spectrum ESM system.

Tactical Electronic Warfare System (TEWS):

  • Elettronica radar warning receiver,
  • OlDelft infra-red warning receiver,
  • Westinghouse ALQ-198(V) active radar jammer,
  • Chaff/flare dispenser.

VII. Armament:

(ADR-04 Mk. X):

  • ADR-04 Mk X 42 x twin-barreled Rheinmetall Type PFG-966 78mm caseless autocannons, firing 100 hypervelocity rounds per minute with an initial shell velocity of 3300 meters per second. The standard ammunition bins have a maximum capacity of 100 rounds per gun. The shells are a mix of APHE (Armor Piercing High Explosive), MKPF-AP (Multiple Kinetic Penetrator Flechette – Armor Piercing) and HEI-T (High Explosive Incendiary – Tracer) rounds with terminal laser guidance. The effective range is 12km on Earth, more on lower-gravity planets like Mars or the Moon. The ammunition is reasonably easy to reload in the field, as the ammunition containers are externally mounted. However, this does require the correct equipment and access frames.

(ADR-04 Mk. XI)

  • ADR-04 Mk XI2 x twin barreled RRG mk15 laser cannons , firing a maximum of 7.5 MJ salvos from each barrel for a combined 15 MJ (2 barrels) or 30 MJ (all barrels) volley. The rate of fire is 40 rpm at full yield. The cannons are accurate out to long distances in advantageous atmospheric conditions.

VIII. Armor:

The armor on the Defender is composed of a standard Chobham laminar developed in the late 20th century and improved with the materials science advances made during the Robotech era. This armor was mainly designed to defeat projectiles and other kinetic weapons. The armor stops all small arms and heavy infantry weapons fire, provides excellent resistance to light mecha-mounted weaponry, such as the Zentraedi 22.3mm HE autocannon round, and fair resistance to medium mecha-mounted weaponry, such as the Valkyrie’s 55mm APFSDS round.

The Defender provides full protection from nuclear, biological, and chemical hazards, using a sealed cockpit environment activated by radiation and hazardous chemical sensors, or manually when biological warfare conditions are anticipated. The internal consumables supplies can provide atmosphere for three days maximum.ADR-04 Mk X 2



IX. Development:

The ADR-04 Mk. X Defender is one of three Destroids that have the Vickers-Chrysler R-04 leg assembly in common. This was a design requirement so as to keep development costs down. While the other Earth-designed Destroid in this series, the MBR-04 Tomahawk, is a main battle robot, the ADR-04 is an air defense robot, intended to either guard important rear area installations, or, by using its comparable mobility, to join the Main Battle Robots on deployments. In the latter cases, the Defender also served as a satisfactory fire support platform, although the armament was unsuited for indirect fire.

Catering to its specialization (close and medium range air defense), the Defender was equipped with a powerful radar system and advanced targeting computer, and with broadband ESM equipment for battle situations in which active radar emissions would not be wise. The system lay-out and integration delivered a fine, capable mecha, but the design process was protracted and expensive, with no less than 9 different versions and prototypes being build (occasionally in parallel) until the production version took shape in late 2008.

ADR-04 Mk X 3As an anti-aircraft mecha, the Defender did a magnificent job, with its extremely effective hypervelocity guns. These relatively large-caliber weapons had a very high muzzle velocity, and thus short flight times and great kinetic energy penetration capabilities, making the shells quite effective against airborne mecha. In addition, the rounds were terminally guided by the mecha, using a semi-active laser designator system. Other mecha could also provide terminal guidance, as the standard laser ranger/designator was used, but only if they were in full datalink with the firing Defender. Ammunition restrictions led to two developments, however; firstly a new external drum was developed that increased the capacity by 50% to 150 rounds per gun, and secondly, a new variant was developed with lasers in the arms instead of auto-cannons, and charging capacitors where the ammunition bins had been. This laser Defender, or the “Mark Eleven” as it soon came to be called, was effective in most situations, but was more expensive in both cost and materials to produce, as well as in power consumption, and never saw widespread use, being stationed at vital strategic points rather than on the battle-field. The ADR-04 Mk. X first entered combat squadrons in March 2009. The Mk. XI appeared in mid 2010.

The Destroids based on this undercarriage were among the most important mecha during the First Robotech War and the later Malcontent Uprisings through 2019. Numerous Defenders lumbered on in reserve units until 2025, and many can still be seen in museums today.



Robotech (R) is the property of Harmony Gold. The Super Dimension Fortress Macross (R) is the property of Big West Advertising and Studio Nue. This document is in no way intended to infringe upon their rights.

Original artwork by: Shoji Kawamori, Miyatake Kazutaka, Haruhiko Mikimoto, Hidetaka Tenjin, and Tim Wing.

Acknowledgement is extended to the work of Egan Loo and the Macross Compendium. Egan Loo is given all credit for all quotes and paraphrasing of the Macross Compendium that has been utilized on Robotech Illustrated. 

Images Courtesy of Chad Wilson (Marchly) and the Macross Mecha Manual. Chad Wilson is given all credit for all images from the Macross Mecha Manual that have been utilized on Robotech Illustrated. 

Acknowledgement is also 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 on Robotech Illustrated. 

Content by Pieter Thomassen, Peter Walker and Tim Wing.

Copyright © 1997, 1995 Robert Morgenstern, Pieter Thomassen, Peter Walker; 2015 Tim Wing