Encyclopedia Astronautica
GEM 40


Solid propellant rocket stage. Loaded/empty mass 13,064/1,361 kg. Thrust 492.93 kN. Vacuum specific impulse 274 seconds.

Cost $ : 2.500 million.

Status: Active.
Gross mass: 13,064 kg (28,801 lb).
Unfuelled mass: 1,361 kg (3,000 lb).
Height: 12.96 m (42.51 ft).
Diameter: 1.02 m (3.34 ft).
Span: 1.02 m (3.34 ft).
Thrust: 492.93 kN (110,815 lbf).
Specific impulse: 274 s.
Specific impulse sea level: 244 s.
Burn time: 64 s.
Number: 1631 .

More... - Chronology...


Associated Countries
Associated Engines
  • GEM 40 Hercules solid rocket engine. 499.2 kN. Air-ignited versions have nozzle ratio of 16:1, specific impulse of 283.4 sec. Isp=274s. Used on Delta 7925 launch vehicle. First flight 1990. More...

Associated Launch Vehicles
  • Delta 7925 American orbital launch vehicle. Four stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K + 1 x Star 48B More...
  • Delta 7925-8 American orbital launch vehicle. Four stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K + 1 x Star 48B with 2.4 m (8 foot) diameter fairing) More...
  • Delta 7925-10 American orbital launch vehicle. Four stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K + 1 x Star 48B with 3.05 m (10 foot) diameter fairing More...
  • Delta 7920-X Three stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K with 3.05 m (10 foot) diameter fairing More...
  • Delta 7920-X Three stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K with 3.05 m (10 foot) diameter fairing More...
  • Delta 7920-XC Three stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K with 3.05 m (10 foot) diameter composite fairing More...
  • Delta 7920-8 American orbital launch vehicle. Three stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K with 2.4 m (8 foot) diameter fairing) More...
  • Delta 7925-9.5 American orbital launch vehicle. Four stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K + 1 x Star 48B with 2.9 m (9.5 foot) diameter fairing) More...
  • Delta 7420-XC Three stage vehicle consisting of 4 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K with 3.05 m (10 foot) diameter composite fairing More...
  • Delta 7326-9.5 American orbital launch vehicle. Four stage vehicle consisting of 3 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K + 1 x Star 37FM with 2.9 m (9.5 foot) diameter fairing) More...
  • Delta 7425-9.5 American orbital launch vehicle. Four stage vehicle consisting of 4 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K + 1 x Star 48B with 2.9 m (9.5 foot) diameter fairing) More...
  • Delta 7426-9.5 American orbital launch vehicle. Four stage vehicle consisting of 4 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K + 1 x Star 37FM with 2.9 m (9.5 foot) diameter fairing) More...
  • Delta 7320-10 American orbital launch vehicle. Three stage vehicle consisting of 3 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K More...
  • Delta 7425-10 American orbital launch vehicle. Four stage vehicle consisting of 4 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K + 1 x Star 48B with 3.05 m (10 foot) diameter fairing More...
  • Orbus American target missile. Three stage vehicle consisting of 1 x GEM-40 + 1 x Orbus 1 + 1 x Orbus 1 More...
  • Delta 7920-10L American orbital launch vehicle. Three stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K with 3.05 m (10 foot) diameter long 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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