Encyclopedia Astronautica
H-2A SSB


Solid propellant rocket stage. Loaded/empty mass 15,200/2,100 kg. Thrust 626.60 kN. Vacuum specific impulse 283 seconds. Provides supplemental thrust for H-2 or H-2A.

Propellant Formulation: HTPB.

Status: Active.
Gross mass: 15,200 kg (33,500 lb).
Unfuelled mass: 2,100 kg (4,600 lb).
Height: 14.90 m (48.80 ft).
Diameter: 1.02 m (3.34 ft).
Span: 1.02 m (3.34 ft).
Thrust: 626.60 kN (140,865 lbf).
Specific impulse: 283 s.
Burn time: 60 s.
Number: 4 .

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Associated Countries
Associated Engines
  • Castor 4AXL Thiokol solid rocket engine. 599.8 kN. In production. Isp=269s. Strap-on booster version, first tested May 1992. Its 30% performance increase would improve performance of Atlas and other vehicles. First flight 2001. More...

Associated Launch Vehicles
  • H-II (2S) Japanese orbital launch vehicle. Three stage version consisting of 2 x H-II SSB boosters + 2 x H-II SRB boosters + core vehicle. More...

Associated Propellants
  • Solid Solid propellants have the fuel and oxidiser embedded in a rubbery matrix. They were developed to a high degree of perfection in the United States in the 1950's and 1960's. In Russia, development was slower, due to a lack of technical leadership in the area and rail handling problems. Solid propellants have the fuel and oxidiser embedded in a rubbery matrix. They were developed to a high degree of perfection in the United States in the 1950's and 1960's. In Russia, development was slower, due to a lack of technical leadership in the area and rail handling problems. More...

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