Add more lift chambers.
Maybe one like the large lift chamber but the exhaust is pointed downwards or straight backwards?
Is it possible in the lore to use suspendium to propel a ships by orienting it a different way?
Helicopter blades would be a cool locked propulsion...
What if i told you....
Helicopter blades are a mod? It was catacalystic expansion, me thinks.
Oh, I know of course. They were just implemented rather poorly thanks to modding restrictions.
But what we REALLY need are gyrocopters!