More Bounce to the Ounce!

My purpose, and my belief, is that the bombs that killed and maimed at Hiroshima and Nagasaki shall one day open the skies to man. —Freeman Dyson, A Space Traveler’s Manifesto, 1958The nuclear pulse rocket is what you’d get if you hired a 12 year old to get you to Jupiter. It works by farting a continuous string of nuclear bombs (at the rate of about one per second) out its back end and riding the ensuing blast waves on a giant shock absorber, like a pogo stick. A series of hundreds or thousands of nuclear detonations accelerates the spacecraft to pretty much any speed you want, and when it’s time to slow down, you just turn around and start nuking in the forward direction. Simple, easy, and fun!The performance on this thing is sensational. Rocket engineers have always been stuck having to choose between thrust and efficiency. Chemical rockets that are powerful enough to get things off the ground (like Saturn V or Starship) are hopelessly inefficient, while the efficient ion motors we…