[LorenPechtel]

Did you account for the weight of storage? Because I would think the tyranny of the rocket equation for such a low ISP would cause various levels of impossibility, not to mention the problem of getting enough thrust.

[shagie]

It was based on “how long would it take to fill the tanks of a Saturn V?” … with the additional “let’s pretend we can 1:1 swap methane and kerosene.”