Encyclopedia Astronautica
Peacekeeper S4


N2O4/MMH rocket stage. 11.80 kN (2,653 lbf) thrust. Mass 1,300 kg (2,866 lb).

Status: Retired 2005.
Gross mass: 1,300 kg (2,800 lb).
Unfuelled mass: 550 kg (1,210 lb).
Height: 1.10 m (3.60 ft).
Diameter: 2.35 m (7.70 ft).
Thrust: 11.80 kN (2,653 lbf).
Burn time: 168 s.

More... - Chronology...


Associated Countries
Associated Engines
  • RS-34 Rocketdyne N2O4/MMH rocket engine. 11.7 kN. Peacekeeper Postboost Axial Thrust. Pressure-fed. 1 main axial thruster per postboost propulsion system. Isp=308s. First flight 1983. More...

Associated Launch Vehicles
  • Peacekeeper American intercontinental ballistic missile. 10 nuclear MIRV warheads. In service 1986-2004. More...

Associated Manufacturers and Agencies
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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