ALTITUDE EVALUATION OF THE INTELSAT II COMMUNICATIONS SPACECRAFT APOGEE MOTOR IN THE SPIN MODE AT AN ENVIRONMENTAL TEMPERATURE AT 55F
ARO INC ARNOLD AFS TN
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An Aerojet-General Corporation SVM-1 solid-propellant apogee rocket motor installed in an INTELSAT II communications spacecraft SN T-1 was fired, while spinning at 120 rpm, at a pressure altitude of 108,000 ft. The primary objective of the program was verification of vacuum performance of the apogee motor after a 75-hr exposure of the motor to a 55 plus or minus 5 F temperature and a near-vaccum conditioning environment. Secondary objectives were to evaluate the control and performance of a strip heater attached to the nozzle flange, to check the structural integrity of a thermal shield on the motor aft dome, and to determine the existence of any significant dynamic coupling between the motor and the spacecraft. Motor performance is presented and compared with data from earlier firings of the same type of motor. Temperature-time histories at selected locations on the motor and spacecraft are also presented. Performance of the nozzle flange strip heaters, the structural integrity of the thermal shield, and vibration data are also discussed.
- Unmanned Spacecraft