9.17 From Kepler's laws, the one-way trip time to LS is 4.98 days. Although the lunar trip time is considerably shorter due to the attractive force of lunar gravity, the actual trip ti~e is extremely difficult to calculate,and for a conservative estimate the lunar trip time is here assumed equal for that to LS. Further assuming one day in orbit at each destination to allow for rendezvous, docking, payload transfer, and routine servicing, total trip time for the OTV, both ways, is 12 days. IX.1.3: Lunar Landing Vehicle: The lunar landing vehicle (LLV) is a manned cargo vessel designed for taking cargo out of lunar orbit and placing it on the lunar surface. The cargo to be caL.ried consists of the lunar base, transport linear accelerator, and the power station for the support of both. The modular pieces of these assemblies are left in lunar orbit by the OTV, and the lunar landing·vehicle rendezvous with the payloads to be transported. The LLV is designed as a manned vehicle, due to the fact that Apollo experience has shown the value of human judgment during landing pcoceJures . It should be noted that,while the unmanned orbital transport vehicle has• the avionics capability for rendezvous, the actual mechanics of rendezvous are no~inally done both in earth orbit and lunar orbit by manned vehicles. The only actual unmanned rendezvous is performed by the DOL approaching the transfe~ vehicle in earth orbit, and by the orbital transfer vehicle in approaching the colony construction site at LS. The lunar landing mission is exactly analogous to the orbital transfer mission described in Section IX.1.2,with the lunar surface as the outbound destination, and lunar orbit representing the inbound destination . In the baseline mission, the payload flow is entirely to the lunar surface from lunar orbit, and this also corresponds to the outbound payload of the OTV. For this reason, the matrix equations of the preceeding section may also be used to derive vehicle mass properties of the LLV.
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