Encyclopedia Astronautica
R-1E



r1e.jpg
R-1E
Credit: Aerojet Redmond
Marquardt N2O4/MMH rocket engine. 0.110 kN. In Production from 1981. Isp=280s. Thruster developed as the Space Shuttle Orbiter's vernier attitude control and orbit adjust thruster. There were six employed in conjunction with the 38 R-40 thrusters.

A 110 N hypergolic thruster was developed as the Space Shuttle Orbiter's vernier attitude control and orbit adjust thruster. There are six employed in conjunction with the 38 3870 N R-40 thrusters. Applications: Shuttle Orbiter Vernier, satellite orbit adjust. First Flown: April 1981 on Columbia. Length: 279 mm, 312 mm satellite version. Maximum Diameter: 15.2 cm satellite version, 14 cm Shuttle version. Mounting: fixed. Engine Cycle: pressure-fed at 15 atm (range 6.8-27.2 atm). Oxidizer: nitrogen tetroxide at 0.0256 kg/sec. Fuel: monomethyl hydrazine at 0.0354 kg/sec. Mixture Ratio(O/F): 1.65 (range 1-2.7). Thrust: 110 N (range 67-155.7 N). Combustion Chamber: single chamber. Expansion Ratio: min ratio of 26 with orthogonal and scarfed nozzles. Combustion Chamber Construction: made of silicide-coated columbium (niobium) and insulated for buried installation.. Ignition: started by electrical signal to on/off solenoid valve. Single doublet injector with hypergolic ignition.. Burn Time: min 82,000 secs demonstrated. 0.89 Ns min impulse bit.

Engine: 3.70 kg (8.10 lb). Chamber Pressure: 7.40 bar. Area Ratio: 26. Thrust to Weight Ratio: 3.02.

Status: In Production.
Unfuelled mass: 3.70 kg (8.10 lb).
Height: 0.28 m (0.92 ft).
Diameter: 0.15 m (0.50 ft).
Thrust: 110 N (20 lbf).
Specific impulse: 280 s.
Burn time: 1,500 s.

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Associated Countries
See also
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...

Bibliography
  • Kudryavtseva, V M, ed., Zhidkostnikh Raketnikh Dvigatley, Visshaya Shkola, Moscow, 1993.

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