Purpose of (the sadly canceled) Ares I upper stage?

DestroyallHumans

New member
Mar 8, 2011
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Why separate from the SRB? Why not just use SRB all the way? I know you can't stop a SRB but you could only fill them to a certain level (maybe thereby making them shorter if you will say something about that).

Why bother with the extra complexity?
dropping the dead weight is implicit with stages isn't it? i mean why put the wider liquid fuel up top? why not just put more or less srb stages?
 
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