Board Thread:Warhammer 40k General Discussion/@comment-25222488-20151025234507/@comment-8881468-20151203092634

if we take the horus heresy,  the gloiriana class (apart from the vengeful spirit) were ~ 26 km, cruisers and battleships somewhere around 5-9 km and escorts smaller than that.

current w40k are about up to 9-10 km for a battleship as far as I remember,

however: those ships need to refuel and rearm and house tons of weapon systems instead of f.e. energy creation, hydroponics and so on.

it is more a question of how to use the space and how to have enough genetic variety to not have retardation due to inbreeding.