Encyclopedia Astronautica Home - Search - Browse - Alphabetic Index: 0- 1- 2- 3- 4- 5- 6- 7- 8- 9 A- B- C- D- E- F- G- H- I- J- K- L- M- N- O- P- Q- R- S- T- U- V- W- X- Y- Z MR-103
Status: In Production. Thrust: 1.12 N (0.25 lbf). Unfuelled mass: 0.33 kg (0.73 lb). Specific impulse: 227 s. Height: 0.15 m (0.48 ft). Diameter: 0.0343 m (0.1125 ft). First Flown: ATS 6 comsat( May 1974 ). Flown: 1014 (1744 produced) planned to end-1997. Dry Mass: 332 gm. Length: 14.7 cm. Max Diameter: 3.43 cm. Mounting Method: bolted three places. Propellant: hydrazine at 0.091-0.499 gm/sec (Shell 405 catalytic decomposition). Feed Method: GN2 at 4.8-28.6 atm through 9 W solenoid dual seat valve. Thrust: 0.19-1.12 (0.89 nominal). Isp: 206-227 sec vacuum. Time to Full Thrust (millisec): 150 to 90%. Nozzle Area Ratio: 100:1. Nozzle Length: 0.98 cm. Nozzle Cooling Method: radiative. Combustion Chamber Pressure: 4.35-23.9 atm. Combustion Chamber Temperature: 800 Celsius. Combustion Chamber Cooling Method: radiative. Duty Cycle: 0.008 sec minimum to unlimited maximum burn. 750,000 pulses. Itotal: 158.46 kNs.
Engine: 0.33 kg (0.73 lb). Chamber Pressure: 23.90 bar. Area Ratio: 100. Thrust to Weight Ratio: .34.
Family: Monopropellant. Country: USA. Agency: Redmond.
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