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| Canon source | Backstage source | Novel source | DITL speculation | 
| # | Series | Season | Source | Comment | 
| 1 | Speculative | (180 m) Speculation, based on comparisons to the NX class in various episodes | ||
| 2 | Speculative | Dauntless Class (180 m) Calculated from the diagram of the ship on the back of the bridge, assuming a 3.5 metre deck height. | ||
| 3 | Speculative | Hierarchy Scout (175 m) Speculation, scaled to be smaller than the assault ship | 
| Source : | Speculative | 
| Comment : | (180 m) Speculation, based on comparisons to the NX class in various episodes | 
| Source : | Speculative | 
| Comment : | Dauntless Class (180 m) Calculated from the diagram of the ship on the back of the bridge, assuming a 3.5 metre deck height. | 
| Source : | Speculative | 
| Comment : | Hierarchy Scout (175 m) Speculation, scaled to be smaller than the assault ship | 
| © Graham & Ian Kennedy | Page views : 19,076 | Last updated : 28 Oct 2003 |