Sorry for the thread necromancy.... But I just have to share this:
One of my Tinashi ships opened fire on a lightly scratched Sagittarius. I made 7 hits (Double Damage) with the Beam attack. Ok, so that isn't so amazing on 4AD, except that I made an additional double 6s on a critical. Rolling a 16 for the hull (don't forget the Double Damage...), the single volley took a minor damaged ship and made it explode instantly! Again, this is sorta expected except that nearby, there was a second Sagittarius, 2 damaged Hermes and nearly all of his fighters (oh, and 2 of my Torthas). The resulting explosion, took out both Hemes, all but 1 fighter stand, and effectively, the second Sagittarius as well.
So, a single 4 AD, Double Damage Beam essentially destroyed roughly 18 fighters, 2 Hermes and 2 Sagittarius! Perhaps this isn't what everyone was looking for, but it certainly was dramatic.
I have to say, that was the best, single beam attack I ever made.