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There is apparently no CG model of the rollbar, and hence no episode showing the rollbar. A combination of stock footage from old episodes and new CG scenes may have sufficed for all purposes. A computer-generated model of the basic Danube was created for "Change of Heart". The most likely reason is that after the appearance of a new miniature of the Danube class for "One Little Ship" no new scenes with the miniature were filmed. In the final two DS9 seasons there was only one rollbar appearance, in DS9: "Resurrection". This is an error, the vessel does not actually have a rollbar. The front side of the pod is unlighted throughout the episode. The rollbar is useful to distinguish this ship from the pursuing Yangtzee Kiang in its standard configuration. Still, there are some subtle differences in its appearances, and possible slight inconsistencies that are discussed in the following.Ī rollbar runabout, the USS Ganges, appears in DS9: "Past Prologue" for the first time. Technically, there used to be just one miniature of the rollbar that could be placed atop the Danube-class model. There is only one type of a rollbar-mounted pod. In fact, the only named runabout of the first two seasons that was seen without the pod was the USS Yangtzee Kiang, but the ship got destroyed as soon as in "Battle Lines" anyway.

Since every one of the four named runabouts could be seen without the rollbar on other occasions, it is absolutely safe to conclude that rollbar runabouts are not a class variant, but that it is an additional mission-specific module.

On all later appearances the runabouts remained nameless. Four runabouts were mentioned by name: the Ganges, Mekong, Orinoco and the everlasting Rio Grande. Most of these appearances fall into the first two seasons. Runabouts with rollbars could be seen on more occasions than many fans think, and in nine DS9 episodes altogether. There were, however, exceptions such as "Visionary" or "The Reckoning" where all runabouts looked alike. In several episodes that featured more than one runabout at a time the it was chosen to equip one of them with the rollbar. Since three runabouts were assigned to Deep Space 9 as stated in DS9: "Emissary", such problems were foreseeable when DS9 was created. The underlying real-world idea of the rollbar is that it would allow the viewer to tell apart two runabouts that otherwise look identical, especially in situations when one is in pursuit of the other.
#Runabouts series
Runabouts of the Danube class may be equipped with a "rollbar"-mounted pod, whose exact purpose is never really revealed in the series and is not described in the DS9TM either.
