I still don't understand the methane engine decision.
XCOR and others have and are testing some very powerful and robust methane/LOX engines. Nasa's excuse to dump it because of high R&D cost is bogus.
Space/Science » in reply to The Wrong Stuff Redux
XCOR and others have and are testing some very powerful and robust methane/LOX engines. Nasa's excuse to dump it because of high R&D cost is bogus.