This article is about the BattleMech. For other uses, see Thunder (disambiguation).
Production information
Manufacturer Ceres Metals Industries[1]
Production Year 3055[2]
Model THR-1L[1]
Class Heavy
Cost 15,613,537 C-bills
Technical specifications
'Mech type Inner Sphere BattleMech
Mass 70 tons
Chassis Hollis Mk III
Armor Ceres Heavy with CASE
Engine Magna 350 XL
Communications System Ceres Metals Model 21-Rs
Targeting Tracking System C-Apple Churchill
Heat Sinks 11 double
Speed 86 km/h
BV (1.0) 1,227[3]
BV (2.0) 1,471[1][4]


The Thunder is a product of the aftermath of the Fourth Succession War. The 'Mech was built to make the most of new technologies that had made their way to the Capellan Confederation at the beginning of the 3050s. This was done by building the 'Mech around a Magna 350 XL engine to maximize the available weight in the 'Mech. The Thunder also uses double heat sinks to make it capable of handling a high heat load from its weapons systems. The 'Mech is well protected with thirteen and a half tons of armor. Its weapons payload, and the design in general, uses a mix of advanced and off the shelf parts. This balanced mix makes the Thunder a valuable asset on the modern battlefield.[5]

Weapons and Equipment[edit]

The primary weapon on the Thunder is the massive Kali Yama Big Bore Autocannon/20 which is capable of devastating most lighter 'Mechs with a single shot. This is backed up with three highly accurate Ceres Arms Model W Medium Pulse Lasers. Finally, for token long range defense capabilities, and giving the 'Mech limited indirect fire capabilities, the Thunder carries a Sian/Ceres Jaguar LRM-5 launcher.[5]


  • THR-2L 
    The 2L model of the Thunder upgrades the design with some of the latest technology, making it a highly destructive close combat 'Mech. The Autocannon/20 has been replaced with an LB-X Autocannon/20 which is capable of using both solid rounds and cluster shot which acts like a giant 'Mech-scale shotgun. The 'Mech is also armed with two ER Medium Lasers and an ER Small Laser. Additionally, the LRM-5 has been dropped in favor of a Streak SRM-6 launcher for additional close range firepower. CASE is installed for the ammo bins. The final touch on the 'Mech is the use of Stealth Armor (and the requisite Guardian ECM suite) which makes the 'Mech much harder for an enemy unit to target. Triple Strength Myomer has also been added to let the Thunder benefit from its higher than average operating temperature.[1] BV (1.0) = 1,453, BV (2.0) = 1,964[6]
  • THR-3L 
    The 3L variant of the Thunder is intended for artillery fire support. The 'Mech is armed with an Arrow IV artillery missile launcher and carries a pair of ER Medium Lasers and a Streak SRM-6 for close range protection. The 'Mech is also outfitted with Triple Strength Myomer, allowing it to travel at speeds of 97.2 km/h when operating at the correct temperature. The 'Mech is also armored with Stealth Armor, making it a much harder target to hit. The 3L is intended to replace the C-3 Catapult in line regiments.[1] BV (1.0) = 1,300, BV (2.0) = 1,950[7]

Design Quirks[edit]

The Thunder has the following Design Quirk:[10]

The THR-C4 Thunder variant is subject to the following Design Quirks:[8]

Related Designs[edit]

Lao Hu - This mech was created by the Capellan Confederation to fix the flaws of the Thunder BattleMech.
Lightning - The Lightning would use the same chassis and weight as its companion, the Thunder.


  • In German products, the unit's proper name was translated to Donner. The model code was changed accordingly to DON-1L.



  1. 1.0 1.1 1.2 1.3 1.4 Technical Readout: Jihad, pp. 146–147: "THR-1L Thunder"
  2. MUL online date for the Thunder
  3. Combat Operations, p. 123
  4. Record Sheets: 3055 Upgrades Unabridged, p. 91
  5. 5.0 5.1 Technical Readout: 3055 Upgrade, p. 58 "THR-1L Thunder"
  6. Record Sheets: 3055 Upgrades Unabridged, p. 92
  7. Record Sheets: 3055 Upgrades Unabridged, p. 93
  8. 8.0 8.1 Technical Readout: Prototypes, p. 131
  9. Record Sheets: Prototypes, p. 71
  10. BattleMech Manual, p. 95 Design Quirk Table - Thunder Entry.