Real G
Still, it is intriguing how the world once embraced atomic power for everything! I remember the promises of atomic powered cars with engines the size of walnuts.
Have you heard of nuclear pulse propulsion? It's a method of spacecraft launch where you basically blow up a nuclear bomb behind you and use the shockwave to propel you. Supposedly it's actually pretty plausible. The U.S. government had Freeman Dyson building a spacecraft for it during the Cold War. Luckily for non-astronauts, the project got terminated. Try googling it, there's actually a ton of info on it.