Heaob

Propellant Capacity Tankage Pressurant Tank weight

Hydrazine monoprop. 83 kg

Two 0.6 m diameter titanium 2.8 kg nitrogen 14.4 kg

Hydrazine monoprop. 136.4 kg

Two 0.74 m diameter titanium 3.6 kg nitrogen 13.3 kg

Unes and Valves Weight

Centra) isolation valve distribution assembly

7.5 kg

Central propellant distribution module

Power Consumption Weight

Sixteen 4.4 N (4 roil, 4 pitch, 8 yaw and AV) Four 0.44 N (roll-yaw) 40 W (catalyst bed and One heaters) 7.6 kg

17.4 W 5.5 kg

Table 10-38 summarizes the attitude-control requirements for the two example spacecraft (see Table 10-13). FLTSATCOM employs body-mounted antennas for its payload and orients one body face to point the antennas toward nadir. FLTSATCOM also has a planar solar array which it orients toward the Sun by combining body orientation and rotation of the array axis. Finally, FLTSATCOM has a guidance requirement for AV corrections. HEAO-B was required to point anywhere except close to the Sun and hold accurate pointing for long periods. It also had modest power requirements and no requirement for orbit correction.

TABLE 10-38. Attitude-Control Requirements for FLTSATCOM and HEAO-B.

Requirement

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