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9

The number of thrusters doesn't matter (that will change how quickly you can execute your $\Delta v$, not the ultimate amount of change you can perform). Just take the efficiency figure from the engine (the linked page says $I_{sp}$ up to 5000s), and plug it in. You can then either take an existing mass fraction and solve for $\Delta v$, or plug in some ...

1

One could obtain an upper bound by reducing it in the following way: The mass density of the atmosphere is 65 kg/m³, which combined with a 15.9km scale height means that the atmosphere has roughly Earth density at 4 scale heights, or ~60km. Which means we can just use Earth number from there and out. We do a simple delta-v cost estimation for climbing up to ...

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