Delta IV (2002-Active)
First Flight: Medium+ = Nov. 20, 2002; Medium = Mar. 11, 2003; Heavy = Dec. 21, 2004
Last Flight: (Active)
Stages: 2
Total Mass: 249.5 to 733.4 tons
Payload Mass: 8,600-22,560 kg to LEO; 3,900-12,980 kg to GTO
Diameter: 5 m
Length: 63 to 72 m
Booster Stage
Type: Medium = GEM 60 Boosters; Heavy = CBC Boosters
Arrangement: M+4,2 = 2 x Solid; M+5 = 2 or 4 x Solid; Heavy = 2 boosters with 1 x RS-68
Thrust (kN): Medium = 826.6 each; Heavy = 3312.8 each
Propellant: Medium = Solid; Heavy = LH2/LOX
ISP: Medium = 275 s; Heavy = 410 s
ISP (sea level):
Burn Time: Medium = 90 s; Heavy = 249 s
Gross Mass: ?
First Stage
Type: CBC Core
Arrangement: 1 x RS-68
Thrust (kN): 3,312.8
Propellant: LH2/LOX
ISP: 410 s
ISP (sea level):
Burn Time: 259 s
Gross Mass: ?
Second Stage
Type: DCSS Core
Arrangement: 1 x RL10-B-2
Thrust (kN): 110
Propellant: LH2/LOX
ISP: 462 s
ISP (sea level):
Burn Time: 850-1125 s
Gross Mass: ?