I agree with your analysis, from the initial rocket concepts the delta-v does look lacking. One note however, I think you may be confusing your kilometers with miles - one needs around 7.8km/s for a stable LEO.
I agree with your analysis, from the initial rocket concepts the delta-v does look lacking. One note however, I think you may be confusing your kilometers with miles - one needs around 7.8km/s for a stable LEO.