Solar Arrays Power output BOL

Size Weight

1,800 W BOL normal incidence 1,200 W @ 7 year 23degincidence Two 2.8 m x 3.8 m panels 92.6 kg

1,500 W normal Incidence 613 W @ 15 deg incidence 13.9 m2 77.1 kg

Battery Capacity Weight

600W-hr(24 A-hr) 89.6 kg total

550 W-hr (20 A-hr) 89.6 kg total

Power Control Type Weight Power

Unregulated array 9.7 kg 12.9 W

Regulated array 33.1 kg 26 W

Power Switching Type

Weight Power

Central switching assemblies (1 for S/C, 2 for P/L) 29.3 kg

4.3 W (S/C bus)

Central switching assembly (1 for S/C, 1 for P/L) 35.5 kg

Included in power control

Power conversion Type

Weight Power

Central S/C bus converter; Separate P/L converters 8.5 kg S/C bus, 78.3 kg P/L 14.3 W S/C bus, 192 W P/L

Converter in switching assembly; Separate ACS and C&DH 4.6 kg ACS, 3.3 kg C&DH Included in subsystems

Cabling Weight Power

72.7 kg 24 W

133.8 kg Included above

Table 10-42 summarizes the structural design of FLTSATCOM and HEAO-B. Figure 10-4 shows the structure of FLTSATCOM, and Fig. 10-5 shows the structure of HEAO-B. The HEAO-B structure was a semi-monocoque in which longerons, stiffened skin panels, and rings carried the loads. Both spacecraft were launched on the Adas-Centaur and were designed to substantially the same boost loads. In the launch configuration, both spacecraft were about the same diameter, although HEAO-B was slightly longer. The on-orbit configurations of the spacecraft were quite different because FLTSATCOM has a large, deployable, solar array and deployed antennas. HEAO-B had essentially the same configuration on orbit as during launch. The two spacecraft had different designs for the load-carrying structure. FLTSATCOM carries loads with a central cylinder. The equipment compartment mounts around this cylinder, and the deployables stay around the outside of the compartment during boost.

Design Integration

Table 10-43 gives relations for estimating the spacecraft's size based on its weight. Equations (10-12) and (10-13) give relations for estimating solar-array area and weight based on the spacecraft's total power. The table compares the actual parameters for FLTSATCOM and HEAO-B to the estimated values.

Fig. 10-5. HEAO-B Structure.
TABLE 10-42. Structural Characteristics of FLTSATCOM and HEAO-B Designs.


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