Delta II (1989-Active)
First Flight: 6000 = Feb. 14, 1989; 7000 = Nov. 26, 1990; 7000H = Jul. 8, 2003
Last Flight: 6000 = Jul. 24, 1992; 7000H = Sep. 10, 2011
Stages: 2 or 3
Total Mass: 151.7 tons to 231.87 tons
Payload Mass: 2,700-6,100 kg to LEO
Diameter: 2.44 m
Length: 38.2-39 m
Booster Stage
Type: 6000 = Castor 4A; 7000 = GEM 40; 7000 Heavy = GEM 46
Arrangement: 6000 = 9 x Solid; 7000 = 3/4/9 x Solid; 7000 Heavy = 9 x Solid
Thrust (kN): 6000 = 4304.7; 7000 = 1478.7 to 4436.1; 7000 Heavy = 5654.7
Propellant: Solid
ISP: 6000 = 266 s; 7000 = 274 s; 7000 Heavy = 278 s
ISP (sea level):
Burn Time: 6000 = 56 s; 7000 = 64 s; 7000 Heavy = 75 s
Gross Mass: ?
First Stage
Type: Thor/Delta XLT(-C) Core
Arrangement: 6000 = 1 x RS-27; 7000 = 1 x RS-27A
Thrust (kN): 1054.2
Propellant: RP-1/LOX
ISP: 302 s
ISP (sea level):
Burn Time: 265 s
Gross Mass: ?
Second Stage
Type: Delta K Core
Arrangement: 1 x AJ-10
Thrust (kN): 43.6
Propellant: N2O4/Aerozine
ISP: 319 s
ISP (sea level):
Burn Time: 431 s
Gross Mass:
Third Stage
Type: Optional PAM-D
Arrangement: 1 x Star 48B
Thrust (kN): 66
Propellant: Solid
ISP: 286 s
ISP (sea level):
Burn Time: 87 s
Gross Mass: ?