You're right about acceleration being an issue. It's possible that altitude is negligible compared to orbital velocity. I'm not sure what you mean by Baumgartne

You're right about acceleration being an issue. It's possible that altitude is negligible compared to orbital velocity. I'm not sure what you mean by Baumgartner wasn't 10% of the way to the ISS. The ISS is at 370km, and the jump was from almost 40km. Of course there are other technical hurdles to getting there, but I was only referring to pure altitude.