I wanted to write a novel about an alternate Earth with no oceans and all land would be floating landmasses. But I can't figure out a proper timeline of technology for the world. Since transportation in my story would be airships like the ones from the game "Guns of Icarus", and there were no water for the invention of boats, what year would the invention of airships begin in?
To add, the landmasses are all natural. They are flying islands. It's a world where all land are naturally flying islands. After a certain height below the islands, everything falls into the molten core.
Sometimes, there can be flying above or below another island. The islands orbits around a "sun", which used to be the core of the planet. The planet was fractured and separated into thousands to millions of islands floating in mid air.
There are some new elements to help the world work, like new gases and solids that are extremely light yet tough. But I haven't quite figured out the new elements yet.