I have figured out a plausible maneuver drive for my space world!
I noticed that the rockets I was looking at were all thermal drives. That means there was a heat source (fusion) used to heat up a reaction mass (hydrogen or water).
Exhaust velocity is a little limited.
I did more digging into the theoretical and found that a drive that released just fused helium from the containment field was possible and gives insane specific impulse. Exhaust velocity is about 6% c.
That's how it operates in high impulse mode. In high thrust mode you dump a lot more reaction mass on the furnace and sacrifice impulse for gees.
The amusing thing is I was trying very hard to emulate the ship technology from Steven Gallacci's Erma Felna universe and at every turn when I dig I find exactly how well he'd done his research.
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