Energia 4S (top) and 2L (bottom) cores in MIK RN in 1999. Note that 4S has mock-up RD-0120 nozzles while 2L (a flight article no less) has flight engines.
Energia 4S (top) and 2L (bottom) cores in MIK RN in 1999. Note that 4S has mock-up RD-0120 nozzles while 2L (a flight article no less) has flight engines.