Weapons are used to attack enemy ships. There are three types of weapons: explosive weapons, ballistic weapons and penetrating weapons. The weapons avialable for use in battle pirates are: thud cannon, rapier missiles, diplomat mortar, ripper cannon, hydra rockets, cutlass missiles, peacemaker mortar and maelstrom rockets. (See each individual page for details)
Weapons can be unlocked by researching them in the weapons lab. Upgrading the weapons lab allows you to research more weapons (see weapons lab page for details). Researching weapons does cost resources.