Well, it depends on how you want your engine to be. You can use rotators or pistons in several configurations to create an engine that doesn't use fuel.
I use a particular input on a rotator and attach it to a propeller (not a pre built one, you have to build one yourself) like on this plane
Well, it depends on how you want your engine to be. You can use rotators or pistons in several configurations to create an engine that doesn't use fuel.
I use a particular input on a rotator and attach it to a propeller (not a pre built one, you have to build one yourself) like on this plane