I was on a fast attack submarine for three years in the mid-90's. I have done sea trials workups where we tested the limits of the boat doing full and flank speed maneuvers, emergency blows, the whole bit. What I know is that some of those nuke carriers are damn fast. Fast enough that a MK-48 ADDCAPP torpedo on slow speed won't catch one, if the carrier is wound out. It has to be on high speed, and even then you better have a relatively close shot and good angle. Now I'm not going to say how fast a Mk 48 is, but I will say that the guys saying some of those carriers can run 45+ knots answering a flank bell are not wrong.
