Type 4. To deliver payload(s) from LEO into lunar or interplanetary trajectories AV > 4000 m/s (which is the average value to escape the Earth) Figure 8.2 Example of Type 4. As future launchers (reusable) shall be optimized for LEO capabilities, OTV's will be an important part of Space Transportation System fleet and will require particular vehicles designed for the mission type described above. And each of them will use an optimized propulsion system which can be: • Storable propulsion • Cryogenic propulsion • Nuclear propulsion • Electric propulsion • New kind of propulsion This subject will be widely treated in the later sections of this chapter.
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