Encyclopedia Astronautica
SLS SRB 2720


Solid propellant rocket stage. Loaded/empty mass 366,716/56,000 kg. Thrust 8,130.00 kN. Vacuum specific impulse 260 seconds. Four such 180 inch segmented solid rocket motors provided first stage thrust for Project Lunex. A liquid propellant first stage was considered as an alternative, but the solid stage was the baseline. Empty mass, specific impulse estimated.

Status: Study 1961.
Gross mass: 366,716 kg (808,470 lb).
Unfuelled mass: 56,000 kg (123,000 lb).
Height: 51.00 m (167.00 ft).
Diameter: 4.57 m (14.99 ft).
Span: 4.57 m (14.99 ft).
Thrust: 8,130.00 kN (1,827,690 lbf).
Specific impulse: 260 s.
Specific impulse sea level: 235 s.
Burn time: 100 s.

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Associated Countries
Associated Launch Vehicles
  • SLS BC-2720 American orbital launch vehicle. The BC-2720 was the member of the SLS family selected to boost the Air Force Lunex lunar lander on a direct lunar trajectory. This would have used four 180 inch solid rocket boosters strapped around an the 'C' Lox/LH2 core vehicle. The core would have required either 12 J-2 engines or 2 M-1 engines. The translunar injection third stage was the 'B', with a single J-2 engine. More...
  • SLS AB-825 American orbital launch vehicle. The AB-825 represented a medium launch vehicle of the USAF 1961 Space Launching System family. The AB-825 would have conducted earth orbit tests of partially-fuelled Lunex lunar lander stages, and also have boosted the Lunex manned glider on circumlunar test flights. It consisted of the 'A' stage and 'B' stages with 180 inch diameter short-length solid fuel booster motors. 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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