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* Combined communication and command and data handling, t Includes 2.8 kg pressurant

* Combined communication and command and data handling, t Includes 2.8 kg pressurant

Subsystem Design

Table 10-37 shows characteristics of the propulsion subsystems for the example spacecraft. Each subsystem uses liquid-hydrazine propellant stored in two tanks. The tanks are pressurized with a fixed amount of nitrogen gas, so the hydrazine pressure decays as propellant burns. The tanks can cross connect through commandable isolation valves. Thrusters and propellant plumbing are redundant and able to cross connect HEAO-B used twelve 4.4-N thrusters mounted in six dual-thruster assemblies. FLTSATCOM uses sixteen 4.4-N thrusters and four 0.44-N thrusters mounted in dual-thruster assemblies.

TABLE 10-37. Characteristics of FLTSATCOM and HEAO-B Propulsion Subsystems.

Characteristic

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