Light fusion engine

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Designed to mimic the compact profile and light weight of Clan-tech XL engines, the light fusion engine weighs only 75% of a standard fusion engine. While not as dramatic as the 50% weight saving of an XL Engine, the real benefit of the light fusion engine is that while it intrudes into the side torsos of a BattleMech, it takes up the same amount of space as a Clan extra-light engine, allowing a light fusion engine-equipped 'Mech to survive the destruction of a side torso that would cripple an Inner Sphere XL engine-equipped 'Mech.[1]


While introduced by the Lyran Alliance in 3062, the technology actually stems from Wolf's Dragoons and Blackwell Corporation. With dwindling supplies of Clan-Tech XL Engines, after the initial Clan Invasion the Dragoons charged Blackwell with developing a new form of lighter than standard engine yet with the same bulk as the Clan extralight.[2]

Using the Lostech protective energy damping grid of the Steiner Stadium on Solaris VII as a base, Blackwell engineers were able to reduce the level of physical shielding with the energy field assisting in keeping the engine's fusion reaction in check.[3] As rumors of this technology began to leak out in 3053, Archon-Prince Victor Steiner-Davion of the Federated Commonwealth entered into protracted and ultimately fruitless negotiations with Blackwell, becoming apparent either the rumors were false or Blackwell would not sell the technology to anybody outside of the Dragoons.[2]

In 3058, after the formation of the Lyran Alliance, the Lyran Intelligence Corps discovered that while a long way from full mass-production, Blackwell had succeeded in developing a prototype. Recognizing the awesome potential of the technology and viewing the possible alienation of the Dragoons as worth the cost to secure it for the Alliance, Archon Katherine Steiner-Davion authorized Loki to steal the prototype. It took Defiance Industries four years and unlimited funding and resources, but the Lyran Alliance Armed Forces were duly impressed with the resulting light fusion engine.[2]

The Dragoons, however, were not, filing charges against the Alliance in the Star League Court. In a slap to the face of the Archon, they sold the light fusion technology via Blackwell to the Lyrans' age-old enemies- the Free Worlds League and Draconis Combine.[4] The technology spread yet further when the Word of Blake's ROM used the distraction of the approaching FedCom Civil War to secure it for themselves.[5]


Model Used by
DefHes 210 Light[6] IS C-MK-O Malak ('Mech)
Defiance 180 Light[7] IS RZK-9S Razorback ('Mech)
Defiance 210 Light[8] IS ARC-9M Archer ('Mech)
Defiance 275 Light[9] IS GRF-6S Griffin ('Mech)
Defiance 275 Light[10] IS GRF-5K Griffin ('Mech)
Defiance 275 Light[11] IS SHD-11CS Shadow Hawk ('Mech)
Defiance 300 Light[12] IS OSR-5W Ostroc ('Mech)
Defiance 300 Light[13] IS OSR-5W Ostroc ('Mech)
Edasich 280 Light[14] IS ARC-7S Archer ('Mech)
Edasich 285 Light[15] IS Marksman M1 MBT (Vehicle)
Edasich 300 Light[16] IS DFN-3S Defiance ('Mech)
Edasich 330 Light[17] IS SCP-12S Scorpion ('Mech)
GM 240 Light[18] IS C-GRG-O Grigori ('Mech)
GM 255 Light with Triple-Strength Myomer[19] IS C-SRP-O Seraph ('Mech)
GM 270 Light[20] IS C-PRT-O Preta ('Mech)
GM 300 Light[21] IS MAD-4K Marauder II ('Mech)
GM 300 Light[22] IS OTL-8D Ostsol ('Mech)
Galas Lightpower 80[23] IS Sprint Scout Helecopter (Vehicle)
Inspiration 280 Light[24] IS C-DVA-O Deva ('Mech)
Leenex 145 Light[25] IS Padilla Tube Artillery Tank (Vehicle)
Magna 260 Light[26] IS TDR-10M Thunderbolt ('Mech)
Magna 350 Light[27] IS WHF-3B White Flame ('Mech)
Pitban 210 Light[28] IS Winston Combat Vehicle (Vehicle)
Pitban 320 Light[29] IS GRN-D-04 Grand Crusader II ('Mech)
Pitban 320 Light[30] IS GOL-6H Goliath ('Mech)
Pitban 320 Light[31] IS TRG-1N Targe ('Mech)
Pitban 320 Light[32] IS GOL-4S Goliath ('Mech)
Pitban 320 Light[33] IS GOL-6H Goliath ('Mech)
PlasmaStar 375 Light[34] IS PRF-1R Prefect ('Mech)
Strand 255 Class B Light[35] IS LGB-12R Longbow ('Mech)
VLAR Light 300[36] IS AQS-3 Aquagladius ('Mech)
VOX 225 Light[37] IS BLF-2Y Blue Flame ('Mech)
VOX 225 Light[38] IS CBR-03 Cobra ('Mech)
VOX 340 Light[39] IS BLR-4S BattleMaster ('Mech)
VOX-LE 200 Light[40] IS NXS2-A Nexus II ('Mech)


  • This article refers to a common object and addresses the object as a common noun. The preferred term is "light fusion engine" (except on section titles & table headings, where "Light Fusion Engine" is favored).


  1. TechManual, p. 50: "Mech Engine Critical Space Table"
  2. 2.0 2.1 2.2 Field Manual: Lyran Alliance, pp. 147–148
  3. Solaris VII: The Game World Player Book, p. 58: "The Arenas - Steiner Stadium"
  4. Technical Readout: Project Phoenix, p. 26
  5. Technical Readout: 3067, p. 84
  6. Technical Readout: 3075, p. 66
  7. Technical Readout: 3067, p. 52
  8. Technical Readout: 3085, p. 256
  9. Technical Readout: Project Phoenix, p. 26
  10. MilSpecs "Griffin"
  11. MilSpecs "Shadow Hawk"
  12. Technical Readout: 3085, p. 246
  13. MilSpecs "Ostroc"
  14. MilSpecs "Archer"
  15. 'Technical Readout: 3085 Supplemental, p. 16
  16. Technical Readout: 3075, p. 86
  17. Technical Readout: Project Phoenix, p. 28
  18. Technical Readout: 3075, p. 80
  19. Technical Readout: 3075, p. 90
  20. Technical Readout: 3075, p. 74
  21. MilSpecs "Marauder II"
  22. MilSpecs "Ostsol"
  23. Technical Readout: 3058 Upgrade, p. 54
  24. Technical Readout: 3075, p. 84
  25. Technical Readout: 3085, p. 32
  26. Technical Readout: 3085, p. 254
  27. Technical Readout: 3067, p. 84
  28. Technical Readout: 3085, p. 40
  29. Technical Readout: 3055 Upgrade, p. 100
  30. Technical Readout: 3085, p. 262
  31. Technical Readout: 3085, p. 72
  32. Technical Readout: Project Phoenix, p. 50
  33. MilSpecs "Goliath"
  34. Technical Readout: 3085, p. 100
  35. Technical Readout: 3085, p. 266
  36. Technical Readout: 3055 Upgrade, p. 148
  37. Technical Readout: 3067, p. 64
  38. MilSpecs "Cobra"
  39. Technical Readout: Project Phoenix, p. 52
  40. Technical Readout: 3055 Upgrade, p. 96