Encyclopedia Astronautica
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.

Thrust (sl): 446.000 kN (100,264 lbf). Thrust (sl): 45,500 kgf. Chamber Pressure: 56.00 bar. Area Ratio: 11. Propellant Formulation: HTPB.

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).
Thrust: 499.20 kN (112,225 lbf).
Specific impulse: 274 s.
Specific impulse sea level: 245 s.
Burn time: 63 s.
Number: 936 .

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Associated Countries
See also
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...

Associated Manufacturers and Agencies
  • Hercules American manufacturer of rocket engines and rockets. Hercules, Wilmington, Delaware, USA. 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...

Bibliography
  • Isakowitz, Steven J, Hopkins, Joshua B, and Hopkins, Joseph P, International Reference to Space Launch Systems, AIAA, Washington DC, 2004.

Associated Stages
  • GEM 40 Solid propellant rocket stage. Loaded/empty mass 13,064/1,361 kg. Thrust 492.93 kN. Vacuum specific impulse 274 seconds. More...

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