The Vengeance-class had a cluster of engines, consisting of three primary engines, two secondary engines flanking the vessel and six auxiliary engines clustering around the primary ones. The Vengeance was only shown defeating a small, probably unmanned CR90 corvette, but the ship class it belonged to had armaments similar to Star Dreadnoughts of the Executor-class. It is known that it was one of the larger Super Star Destroyers of the Imperial era, and its length (exceeding 5,000 meters) put it firmly in the Star Dreadnought category. The ship class's bridge was extensive, but also covered much of the command tower, unlike most other KDY warship classes. The Vengeance-class's height contrasted its length, which was little more than 150 meters and with downward sloping armor dominating most of the dorsal frame. In contrast with the Executor-class, the Vengeance-class's frame was supplied with a slender build, more narrow than standard Star Destroyers, almost sword-like in comparison to the usual dagger shape. In addition, because of its dimensions, the ship class sometimes possessed the standard classification of a space station

As such, the ship class was approximately 19 kilometers long. The Vengeance-class was based on the standard Super Star Destroyer design, the Executor-class.

Star trek dreadnought class