10-1. SPS power management structure............................................. 10-3 10-2. Approach to power management................................................ 10-4 12-1. Typical pre-space station scenario, 1980 through 1984. . 12-2 12-2. Typical space station program option.................................... 12-3 12-3. Typical space station program option.................................... 12-4 12-4. Space station beam manufacturing .......................................... 12-5 12-5. Two-stage ballistic HLLV............................................................ 12-7 12-6. Ballistic single stage concept ................................................... 12-9 12-7. HLLV cost per flight comparison............................................ 12-10 12-8. Baseline shuttle configuration................................................... 12-12 12-9. Shuttle with liquid booster ......................................................... 12-13 12-10. Shuttle with liquid booster and reusable external tank ............................................................................ 12-13 12-11. Liquid rocket booster engine candidates ............................... 12-14 12-12. Candidate electric thrusters...................................................... 12-15 12-13. Electrically powered concepts comparison............................ 12-17 12-14. Independently powered orbit transfer systems comparison........................................................................................ 12-18 12-15. All-propulsive personnel and critical logistics orbital transfer vehicle............................................................................... 12-19
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