Encyclopedia Astronautica
Pegasus-4


Hydrazine propellant rocket stage. Loaded/empty mass 90/17 kg. Thrust 0.67 kN. Vacuum specific impulse 236 seconds.

Cost $ : 0.100 million. No Engines: 3.

Status: Retired 1994.
Gross mass: 90 kg (198 lb).
Unfuelled mass: 17 kg (37 lb).
Height: 0.25 m (0.82 ft).
Diameter: 0.97 m (3.18 ft).
Span: 0.97 m (3.18 ft).
Thrust: 666 N (149 lbf).
Specific impulse: 236 s.
Burn time: 241 s.
Number: 8 .

More... - Chronology...


Associated Countries
Associated Engines
  • MR-107 Redmond hydrazine monopropellant rocket engine. 0.257 kN. Spacecraft and upper stage attitude control and dV corrections, Delta 2, Titan 2, PAM D, SICBM, HAS/Peace Courage, Atlas roll control module, STEP, Pegasus. Isp=236s. First flight 1990. More...

Associated Launch Vehicles
  • Pegasus/HAPS American air-launched orbital launch vehicle. Five stage version consisting of 1 x NB-52 + 1 x Orion 50S + 1 x Orion 50 + 1 x Orion 38 + 1 x HAPS More...

Associated Propellants
  • Hydrazine Hydrazine (N2H4) found early use as a fuel, but it was quickly replaced by UDMH. It is still used as a monopropellant for satellite station-keeping motors. Hydrazine (N2H4) found early use as a fuel, but it was quickly replaced by UDMH. It is still used as a monopropellant for satellite station-keeping motors. More...

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