The high yield torpedo is self propelled and is capable of tracking its target in order to inflict considerable amounts of damage. Due to the large explosion radius, it is less effective against heavy armour. It is not effected by scintillators.
While torpedoes can be launched from a stationary position against another stationary position, they are designed to launch from a moving position. As such they suffer greatly (-12 ACC) if launched against targets that have a 1g-acceleration advantage. As tractor beam cannot reduce 'jitter' in a target, even one that is pinned through the use of tractor beams still counts its combat speed for the purposes of torpedoes.