All I know about spaceships is that the ones that operate from the surface of a planet are true rockets but the voyageurs call them “teakettles” because of the steam jet of water or hydrogen they boost with. They aren’t considered real atomic-power ships even though the jet is heated by an atomic pile. The long-jump ships such as the Tom Paine, torchships that is, are (so they tell me) the real thing, making use of E equals MC squared,
