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ISD-I engines

The four Gemon-4 engines of an Imperial-class Star Destroyer between the larger Destroyer-I ion engines.

The Gemon-4 was a capital-scale ion engine manufactured by Cygnus Spaceworks. Four Gemon-4 ion engines were used for emergency or supplementary sublight drives on Imperial-class Star Destroyers and three Destroyer-I ion engines served as main engine units.[1]

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