[Space, Spaceships] Total ΔV for Interplanetary Travel

[Anthony]

Originally Posted by DaltonS

What is sufficient thrust for this to work?

Dalton “who missed the limit number somewhere” Spence

It's generally a reasonable approximation as long as thrust exceeds local gravity, and gets gradually worse. I wrote a simulator for a simple constant thrust spiral away from a planet a few years back, I can't promise as to its accuracy, but rough results I got were:
10 Gs: 3.6 km/s ΔV for a transfer orbit (less than 3.65 because I assumed an initial 200 altitude)
1 G: 3.65 km/s ΔV for a transfer orbit.
0.1G: 4.6 km/s ΔV for a transfer orbit.
0.01G: 6.9 km/s ΔV for a transfer orbit.
0.001G: 8.4 km/s ΔV for a transfer orbit.
0.0001G: 9.4 km/s ΔV for a transfer orbit.