Wow, you were able to disable it? How? I've set my Myrmidon to full engine power and afterburners and I can't get closer than missile range.
BTW, in FS1 any kind of bomber is worthless. In FS2 there's a big gap between what damage a fighter does to a ship and what a bomber can do, but in FS1 even the Harbinger is relatively weak and you can actually get more damage in on a capship by flying your Apollo real close to the enemy destroyer and firing away with both barrels of Prometheus. Harbingers and Tsunamis are crap because 1) you need a lock to fire them, 2) they get shot down, and 3) they have a godawfully long reload time.
My capship killer of choice is the Athena, which can carry 20 Phoenix, which don't need a lock to be fired and can do a surprising ammount of damage (about 1% hull loss on any destroyer). Just get real close to the target and fire away at point blank, ordering in the support ship every few seconds.