Encyclopedia Astronautica
GEM 60


Solid propellant rocket stage. Loaded/empty mass 33,798/3,849 kg. Thrust 826.55 kN. Vacuum specific impulse 275 seconds. 90.5 bar chamber pressure, 11.0 nozzle expansion ratio. Figures for TVC version. Fixed nozzle version is 599 kg lighter.

Propellant Formulation: HTPB.

Status: In production.
Gross mass: 33,798 kg (74,511 lb).
Unfuelled mass: 3,849 kg (8,485 lb).
Height: 16.20 m (53.10 ft).
Diameter: 1.52 m (4.98 ft).
Span: 1.52 m (4.98 ft).
Thrust: 826.55 kN (185,817 lbf).
Specific impulse: 275 s.
Specific impulse sea level: 243 s.
Burn time: 90 s.
Number: 6 .

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Associated Countries
Associated Engines
  • GEM 60 Hercules solid rocket engine. 851.5 kN. In production. Isp=275s. Used as strap-on boosters for Delta 3 , Delta IV Medium. First flight 2002. More...

Associated Launch Vehicles
  • Delta IV Medium+ (4.2) American orbital launch vehicle. As Delta 4 medium but with 2 x GEM-60 solid rocket boosters and a 4 m diameter payload fairing. More...
  • Delta IV Medium+ (5.2) American orbital launch vehicle. As Delta 4 medium but with 2 x GEM-60 solid rocket boosters and a 5 m diameter payload fairing. More...
  • Delta IV Medium+ (5.4) American orbital launch vehicle. As Delta 4 medium but with 4 x GEM-60 solid rocket boosters and a 5 m diameter payload fairing. 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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