|'Mech type||Inner Sphere BattleMech|
|Communications System||DataTech 401|
|Targeting Tracking System||Skyhunter IV|
|Heat Sinks||10 double heat sinks|
|Speed||129.6 km/h (172.8 km/h with MASC)|
The Mercury debuted for the first time in 2742, intended as a replacement for the aging Wasps and Stingers in use by the Star League Defense Force. Hailed as the beginning of a new age in 'Mech design, the Mercury was faster and better-armed than its competition without sacrificing armor protection. It also featured an advancement in weapons installation, making use of a modular replacement system to allow for easier repairs. The ideal scout and raider, sales of the Mercury were limited exclusively to the SLDF. After the Amaris Civil War and the dissolution of the Star League, those SLDF units which still fielded the Mercury were either stationed on Terra or at the Graham IV factory, all of whom left with General Kerensky in the Exodus.
In the Succession Wars which followed, the Mercury factories were destroyed and the design teetered on the edge of the abyss. Of those SLDF units which stayed behind, the 3rd Regimental Combat Team had the highest concentration of the 'Mechs, with 12 Mercuries gathered together in the 8th Recon Battalion; all of them were ultimately lost during fighting on Sendai in 2798. As the years wore on those desperate few Mercuries still clinging to existence were increasingly rebuilt in haphazard fashion with less advanced and more shoddy parts until they ceased to look quite like the noble 'Mechs they once were. In the end nothing could be done to stop the decline of the Mercury and it eventually became extinct in the Inner Sphere.
It was with some surprise that ComStar unveiled their Com Guards early in the thirty-first century, a brand-new military force fielding a number of extinct designs such as the Mercury. Precentor Martial Anastasius Focht even went so far as to restart three of the mothballed Mercury production lines on Terra to resume production of the original model. A new variant, the MCY-97, was unveiled in time to meet the Clan Invasion (the Clans had also preserved the Mercury, and indeed its revolutionary design was responsible for their development of the OmniMech). One of these lines was eventually turned over to making the Nexus (Star Python) in 3054 while the rest continued to produce so many Mercuries that the 'Mech's life was extended for several more years. This included the dark years of the Jihad, when the Word of Blake also used the Mercury to outfit their Militia.
Weapons and Equipment
The Mercury carries an assortment of energy weapons which helps to extend its endurance on long campaigns. The primary weapons are two Martell medium lasers in the right arm and left torso. The right arm laser's power supply is spread across the length of the whole arm with multiple redundant systems, while the torso-mounted laser is clustered tightly in one area to decrease the chance of a penetrative hit damaging the system. These are supported by two Hessen IX small lasers in the center torso and head and feature the revolutionary modular replacement system. Using 'plug and fight' technology, the lasers are bolted down and connected by wiring to the power feeds and cooling system in three places. If any part of the weapon is damaged or destroyed technicians can replace the entire system in minutes, cutting back countless man-hours of repair and maintenance.
The heart of the Mercury is its MASC system which, in combination with an LVT 160 fusion engine, allows for momentary bursts of speed up to 172 km/h. Though long-term use can damage the actuators, these bursts are often the difference between life or death in some cases. They also make up for the fact that the 'Mech lacks any jump jets, while three tons of ferro-fibrous armor gives it superior protection compared to other 20-ton 'Mechs.
- This variant of the Mercury was created by ComStar in 3049 for recon duties. The armor, engine, and MASC system are kept while one medium laser and one small laser have been dropped in favor of a Beagle active probe, giving the MCY-97 Mercury superior enemy detection capabilities at the cost of half of its firepower. Though an excellent scout, this variant was largely discarded after the Battle of Tukayyid on account of insufficient firepower. BV (1.0) = 380, BV (2.0) = 466
- This variant of the Mercury is the downgraded version introduced during the Succession Wars in 2810. While it retains the same armament and engine of the original, the primary changes in the 'Mech is its armor, using standard armor in place of ferro-fibrous, and the MASC system, which has been removed to allow for the armor to be one ton heavier. These changes lower its maximum speed to 129.6 km/h, but slightly increases the overall armor protection. It also features a Datacom communication system and Scarborough Track targeting system. BV (1.0) = 484, BV (2.0) = 553
- The MCY-102 is an upgrade to the Mercury introduced in 3067 by the Word of Blake. This variant retains the engine, MASC, and armor of the MCY-99, but carries two major modifications; the first is the rebuilding of the chassis using endo steel, which forced removal of one small laser and one medium laser to allow for the second modification: the installation of an improved C3 computer, making it capable of operating with five other units in a C3i unit. Both of the remaining lasers were also changed out for extended range models. BV (1.0) = 408, BV (2.0) = 510
- An upgrade fielded by the Word of Blake during the Jihad in 3069, the 104 uses an XL engine for power. This allows the addition of an extra ER medium laser and TAG to the 102, with the remaining free ton going into improving the armor coverage. The heat sinks are not upgraded, however, so this Mercury could find itself in heat trouble. BV (2.0) = 683
- This Republic of the Sphere variant brings the ancient design back to the forefront using surprisingly little advanced technology. The traditional MASC has been removed and the large XL engine utilized instead to allow this Mercury to travel at speeds over 180 km/h. This design utilizes both endo steel and ferro-fibrous to save weight for its engine. For weaponry the -105 possesses two ER medium lasers, one in the right arm and in the left torso, and two ER small lasers, one in the center torso and the other in the head. 10 double heat sinks keep this variant cool in virtually all conditions. BV (2.0) = 683
- Mercury II - The Mercury II was an enlarged and updated design of the Mercury produced by Clan Wolverine. This 'Mech lacks its predecessor's unique modular repair system, being a standard post-SLDF/early Clan era BattleMech.
- Coyotl - The Coyotl continued the original Mercury's legacy of technological advancement, developing its modular repair system into a fully modular hot-swapping system, leading to the OmniMech.
- In German products, the unit's proper name was translated to Merkurius. The model code was accordingly changed to MRS-97.
- Plastic MCY-99 is included in BattleTech: ComStar Command Level II
Original MCY-98 Mercury from TRO:2750
MCY-98 Mercury from TRO:3025 Revised
MCY-97 Mercury from TRO:3050
MCY-99 Mercury from TRO:3050 Upgrade
Mercury from RG:ilClan v19
Mercury concept sketch from 2019 Clan Invasion Campaign
An MCY-97 Mercury in battle from CCG
- Technical Readout: 2750, pp. 16-17, "Mercury 'Mech Profile"
- Combat Operations, p. 106
- Technical Readout: 3050 Upgrade, pp. 184-185, "Mercury 'Mech Profile"
- Record Sheets: 3050 Upgrades Unabridged (Clan & Star League), p. 221
- Technical Readout: 3025 Revised, p. 6-7
- Technical Readout: 3039, p. 238
- Technical Readout: 3050 Upgrade, p. 184-185
- Combat Operations, p. 123
- Record Sheets: 3050 Upgrades Unabridged (Clan & Star League), p. 220
- Combat Operations, p. 121
- Mercury MCY-98 MUL entry
- Record Sheets: Upgrades, p. 34
- Record Sheets: 3050 Upgrades Unabridged (Clan & Star League), p. 222
- Record Sheets: 3050 Upgrades Unabridged (Clan & Star League), p. 223
- "Recognition Guide: ilClan, vol. 19", pg13
- BattleMech Manual, p. 93: "BattleMech Quirk Table"
- BattleMech Manual Errata (Version 6.01), p. 9
- Jihad Secrets: The Blake Documents, p. 148
- Field Manual: Warden Clans, pp. 40-42, "Birth of the Titans" & "Crusade of the Valiant"