How about a Hybrid Launcher
Four RD-180s in the core (2nd) stage and zero, two or four - 5 segment SRBs. It's called Centurion.
http://www.ssdl.gatech.edu/main/ssdl_paper_archive/aiaa_2004-3735_paper.pdf
Space/Science » in reply to Strap on problems
Four RD-180s in the core (2nd) stage and zero, two or four - 5 segment SRBs. It's called Centurion.
http://www.ssdl.gatech.edu/main/ssdl_paper_archive/aiaa_2004-3735_paper.pdf