re: Non-experimental rocket planes...
I'm willing to concede the ME-163 was a production aircraft if you are will to concede it was put into service before it was ready.
I just don't see using data of a system that remotely related to the current rocket planes for the reasons I've stated.
On a related question...so why do you think he excluded Spaceship One data?
Possibly because it would render his argument mute?