
the lower the number the less heat weapon use generates
(I think that's right)
someone done goofed at ADH because larger surface areas radiate heat more efficiently than smaller surface areas
whilst it is also true that larger volume objects retain core heat for longer, it's probably safe to assume that mechs conduct that heat to heatsinks located on the outside of the mech, thus larger mechs have more space to mount such things
oh, and let's not forget that all of the Cs have two giant lumps of metal that flap around like wings that could easily be explained as being heatsinks as well as armour limbs
(it's not like they're any damn use as armour now are they)
it also makes more sense to give the big boys more heat sustain than the little chaps because they can't break off so well to cool off for a moment
the above numbers need to be reversed, or pegged at current A levels and reduced for the Bs and Cs in proportion to the above

 

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