1. velocity Specific impulse Thrust 1818 kgm (4,000 lbs) 1364 kg (3,000 lb)
2. The table indicates that it would requir 8-72 days to put a '10,000 kgm satellite into a synchronous orbit and another 5.503 days to bring back the tug. Actually, these flight times represent upper bounds because the thrust program was not optimized. An optimized thrust program was worked out, C39) but it was not available when the calculations presented here were performed. It was also discovered that the shuttle vehicle will be able to deliver a 65,000 lb maximum payload to a 400 km high circular working orbit.C3o) By raising the altitude of the initial parking orbit to 400 km and employing an optimized thrust program the time required to deliver the paylad to synchronous orbit could be reduced to about 5-5 days and the return time to about ·3.5 days. Figures 4 and 5 correspond to Table 9 and describe the trajectories going and returning from the synchronous orbit. Table 9. Successive maneuvers for delivering 10,000 kgm payload to synchronous
3. •113 8,266 • .073 503. 67-7 130. 70.2 560. 13 1.0078
4. •238 10.751 • •093 664 • 69.5 149. 70.0 623. 10 3-9758 5 .309 12., 573 .108 675- 69.4 157. 70.0 707. 9 4.9974 6 .426 16,632.145 910. 69.8 147. 70.0 1,455- 6 6.0819 7a .416 18,371 •170 10,159 • 80.3 188. 80.5 9,688. 5 6.6002 8 •695 42,140.451 6,380 • 69.5 1,019. 51. 8 2,004. 1 6.9987 9b .ooo 42,140 • -997 40,297. 79-3 return 0 •000 42,140 • -997 1 •727 42,140 • .438 39,720. 71.8 2 •570 24,272 • .221 728. 53-9 3 •391 15,196 • .131 708. 69.9 4 .269 11,437- •098 1,061. 63.5 5 .000 6,573-061 618. 69.9