Imperator5 wrote:There have been multiple ship scales mentioned in the background material.
Escorts: 1km to 3km (one time 20-30km)
Light Cruisers (most likely light cruiser too): 3-4,5 km
(Battle) Cruisers: 3km, 5km, 6km, 9km
Grand Cruisers: 7km, 13km
Battleships (most likely battlebarge too): 6km, 8km, 16km. (one time smaller than 2km)
Gloriana: 15km, 25km I think.
The not to scale models conform usually to the smaller numbers, the artwork to the bigger numbers, if we accept the Escorts being 1-3km long.
I use Rogue Trader for scaling, as it's a major point of it. But for a particular bit of ludicrousness one of the old Space Marine Battles era stuff (Before BFG even) said a Lunar Class was 20km. (I wish I could remember which one though....)