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Originally Posted by GURPS Fox
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I'm wondering because a setting that I'm working on would have present-day reaction drives to be considered 'semi-cinematic' reaction drives...
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It's easiest to do almost anything related to Delta-V in Gurps Spaceships so i recommend getting that.
The Real World/TL 8 rockets in that supplement give you 3 Gs of acceleration per 5% of ship's mass used for engines and 0.15 miles per second of Delta-V per 5% or ship's mass used to carry fuel.
There are dirves in Spaceships do will exceed one or the other or even both of those numbers and sometimes by a lot. Soem are even labeled Cinematic rather than Superscience (TL^) but we probably need more information about what you want. There just isn't a "standard" Gurps campaign or even a "Stadnard Gurps campign with Semi-Cinematic Rockets". Gurps is made to custom fit every game differently.