Encyclopedia Astronautica
Liberty 2


N2O4/MMH propellant rocket stage. Loaded/empty mass 2,180/180 kg. Thrust 17.79 kN. Vacuum specific impulse 300 seconds.

Cost $ : 1.250 million.

Status: Development ended 1988.
Gross mass: 2,180 kg (4,800 lb).
Unfuelled mass: 180 kg (390 lb).
Height: 4.02 m (13.18 ft).
Diameter: 1.43 m (4.69 ft).
Span: 1.43 m (4.69 ft).
Thrust: 17.79 kN (3,999 lbf).
Specific impulse: 300 s.
Specific impulse sea level: 200 s.
Burn time: 326 s.

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Associated Countries
Associated Engines
  • Liberty-2 Notional N2O4/MMH rocket engine. 17.8 kN. Development ended 1988. Pressure-fed engine. Isp=300s. Used on Liberty launch vehicle. More...

Associated Launch Vehicles
  • Liberty American low cost orbital launch vehicle. Private commercial launch vehicle. More...

Associated Propellants
  • N2O4/MMH Nitrogen tetroxide became the storable liquid propellant of choice from the late 1950's. Monomethylhydrazine (CH3NHNH2) is a storable liquid fuel that found favour in the United States for use in orbital spacecraft engines. Its advantages in comparison to UDMH are higher density and slightly higher performance. More...

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