Figure 8.14 Personnel OTV. An Intra Orbital Transfer Vehicle (IOTV) with a 1 or 2 man crew for inspection and service was also evoked in the STS, but no specific study of this concept has been undertaken. Transportation cost analysis. Detailed cost studies were carried out for the Boeing Reference Transportation System. They include the ground operations and system maintenance (Kennedy Space Center as reference), and a fleet of: 6 HLLVs, 2 PLVs, 23 EOTVs and 2 POTVs. For each vehicle, the number of flights, the cost per flight, the cost per SPS, and an estimated total transportation cost for DDT&E are summarized in Figure 8.15 (all costs are expressed in 1980 US Dollars). Figure 8.16 shows the relative costs of the transportation system in the total SPS analysis. In the development phase, the STS represents 45% of total expenditures, and it becomes 25% during the operational phase (with HLLVs accounting for 70% of the STS costs). Figure 8.15 Total Transportation Cost Summary (in “1980s” millions).
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