(Answered) IO - Super-cooled myomers and XXL engine

[CrazyGrasshopper]

Could you clarify the interplay between the Super-cooled myomers (IO, p.94) and the XXL engine (TO, p.309) considering the the heat produced by movement?

[Xotl]

The effect of Super-Cooled Myomers is unaffected by engine type.  A unit equipped with an XXL engine follows the same rules as any other.  By extension, this makes the Super-Cooled Myomers more effective on an XXL engined BattleMech.  Note that as with all other engines, jumping heat is unaffected and would follow the rules for XXL engines as detailed in TO.

[CrazyGrasshopper]

Thank you, this clarifies things.

Also, while we are at it, the errata for the XXL (TO, p. 309) engine says something very confusing about Improved Jump Jets used with this type of the engine: "the heat modifiers for improved jump jet use and jumping with an XXL engine cancel each other out." I understood this as the heat for jumping doubles whenever the unit mounts an XXL engine, iJJ's or both. Other options would be unreasonable. It's just that the wording is really confusing.

[Xotl]

XXL engines double the jump heat.  IJJs halve the jump heat.  You just ignore both of these mods if you have both and are jumping.

[CrazyGrasshopper]

Right, thanks again. My understanding of IJJs was incorrect, I, apparently, missed that point in the errata.