A Culverine (demi-culverin) is a large gun installed on a ship. Culverines are especially developed to shoot in long distances , more than that of a normal cannon. Culverines were more expensive and needed more time to reload than cannon. However cannons do more damage than culverines.
12 lbs Range: 400 Reload Time: 30 Cost: 14 000 gold
16 lbs Range: 450 Reload Time: 24 Cost: 42 000 gold
24 lbs Range: 400 Reload Time: 30 Cost: 70 000 gold