@scythe They won't be appearing in Grassblades, I can promise you that! XD
They're for a fantasy world that's sort of industrialised - I guess it's kind of steampunk, but also kind of not? Steam-tech is definitely there, but not everything depends on it, and the world lacks some of the common Victorian-era morals and social systems that tend to get imported into steampunk along with the tech.
There are several types of airships, and one of the on-going things in the background of the story is the shift from old-fashioned wooden vessels over to a more modern iron-clad type. Still sailing vessels, but with sturdier hulls and rams built into the fore of the ship. I'm not 100% settled on exactly what it is that makes them fly, but I'm thinking of combining steam-tech/mechanical solutions (for the general running of the machinery aboard the ship) with some sort of semi-magical natural resource that kind of levitates, and which is used to lift the ship into the air. So the levitating mineral/whatever would be controling the vertical position of the ship, while the wind and various steam-tech/machinery controls the horisontal position of the ship.
At least one of the older models of ship has folding wings on the side made of sturdy sailcloth stretched over reinforced wood - it looks kind of like a mechanical bat-wing - that they use to manouver with. The iron-clads come in several different varieties - some with the folding bat-wing (made with heavier, more durable materials) and some with a more fixed-wing solution, with smaller wing-like structures bolted onto the sides of the ship, that can only be tilted slightly - whereas the bat-wing can be folded in all the way to lie nearly flat against the hull, but can also be stretched out into the full width of the wingspan.
... I confess that some of this might have been heavily influenced by how much I loved the airships in Final Fantasy IX. >.>