How to build this?

I think any reasonable continuous accelerating engine will be very low
acceleration. Tops 0.01 gravities.

I can think of several systems. The obvious one is the mass driver.
The second obvious one is an ion engine. There are other designs I can
think of. I doubt nuclear is going to be an option used. i think it
will be a solar powered electrical engine that accelerates reaction mass.

Bill

> ok maybe wasn't mars... Jupiter? :)
> If the engine is nuclear and burns some heavy gas fuel heating it to
plasma
> temperatures the mass required shouldn't be extreme at all... solar or
> chemical don't even bother to do the math, but a nuclear plasma jet
engine
> should be able to deliver that sort of acceleration... thinking
mostly out
> of comparison with smaller systems, so maybe just talking straight
out my