[jandrese]

The problem is when you work out the math on rocket that can sustain 1G for multiple days with any Earthly isp you realize the math just doesn't work. Even if you go nuts and plug in a number like 1 million seconds (our best chemical rockets are more like 450 seconds) for the isp it is still nowhere close to feasible using only the mass of our solar system.

As long as you are stuck flinging mass out of the back of your rocket to accelerate you don't get to go anywhere outside of our solar system.

[mr_toad]

A beamed core proton-antiproton rocket could produce millions of ISP and allow accelerations of up to 0.7C, using relativistic mesons as the reaction mass. It is entirely theoretical though.

https://ntrs.nasa.gov/api/citations/20200001904/downloads/20...

[midoridensha]

>The problem is when you work out the math on rocket that can sustain 1G for multiple days with any Earthly isp you realize the math just doesn't work.

>our best chemical rockets are more like 450 seconds

If we're talking about leaving the Solar system, and 1G rockets, why on Earth would you ever even think about primitive chemical rockets? Obviously, nuclear rockets are a mandatory first-step before getting close to that level of technology.

And given that we already have nuclear power plants, as well as designs (untested) for nuclear rockets, why even bring up chemical rockets?

[kjkjadksj]

Dyson proposed a fusion pulse propulsion system in the 1960s that was estimated at 70000 isp. Maybe 1m wouldn’t have been that far off from the limits of these crafts if test ban treaties didn’t kill their development.

[lapama]

What about that strage propulsion system announced by caltech a few years back? Sorry really I have no more knowledge.