I'm wondering how far the upper plate gets thrown by the steam pressure from the heating and erosion of the upper misting plate. hope they used good chewing gum. I am a fan of F9, F9 Heavy, and certainly entertained by starship, but the use of this site for this energy level just because the personality involved is not interested in dealing with the US ACE's requests on compliance is sad. As a system, parking this stacks upper on an unprepared surface on the moon or Mars, and then taking off again from the same surface seems to have some rather large risks. From a prepared, elevated pad self inflicted injuries occur, how's that going to play out on a rocky unprepared surface? Apollo had many great concepts...