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Having eyeballed the numbers, the Epstein drive is within the realms of what's theoretically possible for fusion drives, but rather beyond the limits of what we know to engineer, or can really guess at in much detail. The biggest thing they handwave away in the plot is less the delta-V and more the part where using the main drive within a few kilometres of another ship would vaporise their hull plating and give your own crew radiation sickness with the backscatter because of the enormous, ridiculously hot, energetically radiating propellant plume.
– anaximander
Commented May 22, 2023 at 19:37

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