> Apparently you are one of those stubborn ones who can't admit when they are wrong.
Let me know when I'm wrong.
> According to XCOR, it's just a "bit" harder.
They were simplifying.
How involved have you been in launch vehicle analysis and design? Specifically, single stage to orbit vehicles?
"They were simplifying."
ahh, I see.
"How involved have you been in launch vehicle analysis and design? Specifically, single stage to orbit vehicles?"
Is that you changing the subject because I was right? This reminds me of teaching an undergrad. Here let me make it simple for you: On a scale of difficulty, if a suborbital 100km shot is a 1 and an orbital John Glenn flight is a 10, then a New York to Sydney is an 8, much closer to the John Glenn than the Alan Shepard.
As to your question, my doctorate in mechanical engineering dealt with radiation transfer from high temperature rocket exhaust and have consulted for NASA and other companies several times. But that's irrelevant; anybody who can read this thread is able to understand your error.