High-energy turn

A high-energy turn (HET) was a maneuver that allowed one to turn a starship very rapidly. The odds of success varied greatly upon the mass of the starship in question. By using additional energy, the ship could be made to turn at a much higher rate than usual. This allowed a ship to make up to a 180° turn nearly instantaneously. As one might expect, this was not good on the ship. The hull, systems, and crew took a tremendous strain. Eventually this strain would result in a breakdown. Some ships were better at making HETs without having a breakdown and ships with superior flight controllers could make more HETs without suffering a breakdown. It was also called a "warp turn" because performing an HET required the generation of a. (, Star Fleet Battles)

Even ships as massive as prison ships could perform HETs; however, the last recorded use of an HET on a ship of that class resulted in a fifty-fifty chance of success.