Knight In Leather Armor
Badger Nutsack
Uranium on its own is not thruster fuel, it would still require something like water to work with to produce thrust.
Otherwise it would have to be some kind of nuclear electrical engine and they don't produce that much thrust (it takes time for such a rocket to speed up).
As for the technology levels in the Fallout world, it differs per era. They got a head on us on technology like nuclear fusion and power armor, but they are quite behind on miniaturizing of electronics (with the exception of the Big Empty perhaps), and circuitry, and technologies that rely on these.
Like I said, I don't know that much. My logic goes as follows.
"Does it make sense? Does it seem realistic? Is it not stupid?"
And I go from there. Common sense and all that.