While bulk trade is primarily handled by ships in the sea, airships control much of the exotic and perishable markets. They are able to transport goods faster over large distances and directly to places located far from the sea.
Airships have hulls made of balsa wood while gas bags are made from the intestines of mammoths (known as goldbeater’s skin). It uses a gas known as spirit of flight* or ‘droll wind’ because of its peculiar ability to change the pitch of one’s voice. The only known source of spirit of flight is within the Freehold. Ballonets are filled or emptied of air with bellows that control an airship’s altitude.
Airships use wind for propulsion with sails on the top deck as well as below the keel for stabilization. When landing near the ground the lower sails are capable of being raised up towards the hull’s undercarriage.
*Authors note: spirit of flight is helium. It is harvested from geysers.