battleships(dreadnaughts) under 3000m
carriers under 2000m
cruisers up to 1500m (give or take)
destroyers up to ~750m
frigates = ~500m
corvettes = 100-200m
gunships = 50m
bombers = 30-35m
siege = ~30-35m
heavy = ~30-35m
interceptor =30m
suprieroity = 30m
medium = 20-25m
light = 20m
Note that some ships of a class may be longer than the next class up. (Widow is longer than the crossbow, Cobra is longer rapier). The just lack the armor, weapons...etc
I think the Pirhana is the smallest, because I stayed with canon there. I could reduce the size of the ships, but then pilots would get reduced to.