[youareostriches]

>Like "what power source can we make fly that can do this output?"

How about actively reacting fissile material? I suppose there wouldn’t be much difference if the thing were already carrying a warhead.

Or maybe create the tip of the vehicle out of magnesium and ignite it immediately before launch.

[m4rtink]

Might as well use a nuclear salt water rocket - but with smaller nozzle also in the front! https://en.m.wikipedia.org/wiki/Nuclear_salt-water_rocket

That would make everything even more insanely radioactive. :)