Concept and Fictional Background
The idea for the runabout came from the need to provide a way for characters to move away from Deep Space Nine, and also allowed the show to explore Star Trek's themes of exploration and discovery despite DS9 being set on an immobile space station. In order to help the new show establish its own identity separate from The Next Generation, the decision was made to have something larger and more capable than the shuttlecraft seen in previous series of Star Trek. The series bible describes the Danube class vessels as "the symbol of the Federation presence in sector". The Starfleet design elements were intended as a touch of familiarity for the characters (and in turn, the viewers) in environments dominated by alien designs and structures, specifically the Cardassians and Bajorans.
The hull of the Danube class runabout is shaped roughly like a long, rectangular box. A downward-curving 'wing' is located on each side of the vessel; these start near the top of the hull, and curve down to the warp nacelles. The runabout's impulse drives are located between the wings and the vessel's body. The Deep Space Nine Technical Manual gives the runabout's dimensions as 23.1 metres (76 ft) long, 13.7 metres (45 ft) wide, and 5.4 metres (18 ft) high. The runabouts have a two-person flight crew, and can carry two other crew. They are fitted with a two-person transporter and accommodation bunks for long missions. According to the first season episode "Dax", they were capable of speeds up to Warp 5. Although not explored in the series, background materials indicate the runabout had a modular mission payload system, where the middle section of the runabout could be swapped out for modules carrying different equipment.
From the third season of DS9 onwards, much of the exploration aspect of the series was facilitated by the starship USS Defiant, which took over much of the runabouts' previous role in allowing characters to move off the station. Defiant was introduced because the producers wanted the series to have a better connection with the themes of exploration and discovery shown in previous Star Trek works and needed a way to have more than two or three characters at the same place 'off-station', while the introduction of the Dominion as an antagonist during season two created the in-universe requirement for a more powerful and combat-capable starship based at Deep Space Nine.
In The Star Trek Encyclopedia, Michael and Denise Okuda speculate the Sydney-class transport Montgomery Scott (James Doohan) is rescued from in The Next Generation episode "Relics" may have been, in-universe, an early runabout design. Although the name "Danube class" appeared in supplementary materials like The Star Trek Encyclopedia, it was not spoken onscreen until season four episode "Hippocratic Oath".
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