I wonder if Garth just happened to experience the "sudden engine crit bug" when he was bragging about coring an Atlas in <3 seconds....
So, stock Atlas center torso rear has 28 armor (20 if you core a -K side torso), plus engine hp (15, according to the ItemStats.xml), so he would have to do 43 damage in a span of 2 alphas, about 3 seconds (first shot, cooldown, second shot).
so, to do that, you would have to have an alpha of at least 22 damage. Let's take the Jenner-F. 6 energy hardpoints would give you the option to load 4 small lasers (12 damage) and 2 medium lasers (10) for your 22 damage. Generates 16 heat per alpha, with only 4 tons used. So with weapons (4 tons), Structure (3.5 assuming standard), Armor (let's armor him up, all 238 points of armor, rounded to 7.5 tons), and the engine (260 standard or 300 XL with 4 more heat sinks) brings him up to 35 tons (give or take .5 tons).
With the 300 XL installed, he would have 14 heat sinks, or 1.4 hps dissipated with singles, and a maximum heat capacity of 44. So, let's have him run into the battle (2 heat), alpha once (16 heat, brings to 18), cool off for 4 seconds (5.6 heat dissipated, heat down to 12.4), alpha again, killing the atlas (16 heat again, up to 28.4, only 65% on his heat readout, although the beam duration did dissipate heat, so at the end of the alpha he would only have 27 heat total, the highest he would go would be 61%) and he can run away. And that's with SINGLES. He'll cool that off in a few seconds and the enemy has one less atlas.
Of course, that is assuming perfect piloting skill, but I'm sure Garth has super accurate aim
.
Point is, you can core an atlas with singles in a light if your'e awesome, assuming that the rear center torso takes all of your damage. You can bump up the heat sink number even moreso if you use endo-steel as well (although in a Jenner, you would only get 1 or 2 more). I wonder why no one is yelling "Endo-steel is OP!"....