LEASAT liquid apogee motor subsystem performance

This paper describes the performance of the bipropellant propulsion subsystem for the LEASAT spacecraft. Two LEASAT spacecraft have been successfully Shuttle-launched and are currently providing satellite communications services to the United States Navy. The bipropellant subsystem, which utilizes monomethylhydrazine and nitrogen tetroxide, provides the impulse required for apogee augmentation and injection into synchronous orbit at apogee. The LEASAT spacecraft were launched in August and November of 1984. The flight data obtained support the results of analytical modeling and subsystem level test data as well as performance data supplied by vendors.