As shown on this schedule, transportation is the pacing program element. Development of a Shuttle derivative heavy-lift vehicle with capability of 91,000 kg (200,000 lb) to LEO must start around 1980. This vehicle would support the deployment of the orbital transfer vehicles and the crew/cargo modules, permitting the initiation of GEO base construction and deployment of construction equipment for the SPS test and pilot programs. The economics of a full-scale SPS program, however, dictate a totally reusable earth launch vehicle. This is a logical follow-on to the Shuttle-derived HLLV and development should start about 1984 to support the construction activity that leads to an SPS IOC in 1995. The construction base itself can evolve readily from current space station planning, assuming a go-ahead on Space Station in the late 70!s. An operational space station in LEO in the 1983 to 1985 time frame may support go-ahead of a GEO base and construction equipment by 1985-1986. At approximately the same time, go-ahead would be required on the satellite and the rectenna. This general scheduling supports a demonstration (pilot) operation in the early 1990's, with IOC by 1995. To support the full 120-satellite program at a construction rate of four satellites per year would require 231 earth launch vehicles, 192 orbital transfer vehicles, and 5 crew cargo modules. Utilizing this schedule, program funding curves can be developed. 5.2 ECONOMIC COMPARISONS - This section presents the cost data developed during the study. These data include cost summaries, costing ground rules and assumptions, costing objectives and approach, program cost relationships and comparisons, and system costs by fiscal year. The costs include design, development, test, and evaluation (DDT&E or nonrecurring), and production and orbital construction (recurring). Estimates of operations and maintenance (O&M) costs are included in Section 5.2.4 on user cost projections. 5.2.1 System Cost Estimates Cost estimates were developed for project management, systems engineering and integration, the satellite, ground support systems, space transportation and the orbital construction base. Table 5.2-1 summarizes the total program cost of $850.0B in terms of DDT&E and production. The DDT&E costs are $57.7B or 7 percent of the total. Production costs are $792.3B. As shown in Table 5.1-1 ground support systems costs make up the largest portion of the total, $435.8B or 51 percent. It may be noted that launch support at $199.IB and the rectenna cost of $148.6B represent approximately 80 percent of the ground support systems cost. The satellite plus orbital construction base costs are one-third the total cost at $283.IB. Space transportation systems constitute just under 8 percent of the total.
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