JulienSlink

I have a question here. Why my nuclear turbojet、ramjet，even nuclear light bulb are not able to change propellant? When I right click those engines, there is no "next propellant"button. My engines have been upgraded, and I even unlocked all the tech tree for this. Help me plz, Jeb on EVE is waiting for this engine to get home.

So when can my v1.4.3 enjoy the kss? I'm thirsty for experiencing it.o(╯□╰)o