Encyclopedia Astronautica
RSA-4-4


Hydrazine propellant rocket stage. Loaded/empty mass 300/100 kg. Thrust 0.40 kN. Vacuum specific impulse 230 seconds. Specific impulse estimated. Maximum propellant load indicated (hydrazine monopropellnat contained in 4 x 50 l tanks). Upper stage used for orbit circularization at apogee, dispensing of dual payloads, third station nutation damping. Equipped with 2 x 200 N engines for maneuver, 4 x 200 N for roll control, and 4 x 25 N for yaw and pitch.

No Engines: 2.

Status: Development 1988.
Gross mass: 300 kg (660 lb).
Unfuelled mass: 100 kg (220 lb).
Height: 0.67 m (2.19 ft).
Diameter: 2.40 m (7.80 ft).
Span: 2.40 m (7.80 ft).
Thrust: 402 N (90 lbf).
Specific impulse: 230 s.
Burn time: 1,100 s.

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Associated Countries
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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