Reactionless drive ships orbital flight in 3rd ed physics?

[evilDictatorInTraining]

Originally Posted by dcarson

Because it needs to fly for a lot longer than any fuel could last.

The distinction between deep space ship and planetary body launch capable is useful for a reason.
I would suggest either one ship have multiple types of engines (one engine with high thrust for lifting off planetary bodies and another with high/unlimited efficiency for long range space travel).
Or more realistically splitting those into two ships.
A shuttle to take you into orbit and a pure space craft (powered by your reactionless drive) to take you quickly to other planets.