The Gemon-4 was a large model of ion engine manufactured by Cygnus Spaceworks for use on Imperial I-class Star Destroyers. They were also used on Imperial II-class ships, but only as emergency drives.
Behind the scenesEdit
In Star Wars Legends, Gemon-4 ion engines were first identified in The Galactic Empire—Ships of the Fleet pop-up book, however, with their canon identification in Ultimate Star Wars, they appear to be the Imperial-I's primary and only ion drive, supplanting the Destroyer-I ion engine.
- Ultimate Star Wars (First identified as Gemon-4 ion engine)