Stage expended: 25.7 MT GEO round trip: 1.2 MT GEO delivery: 5.4 MT GEO retrieval: 1.8 MT For comparison, the MSFC baseline Tug of October 1974 is designed as a reusable single stage containing a usable propellant loading of 23 metric tons has the corresponding payload performance values as listed below: Stage expended: 10-6 MT GEO round trip: -9 MT GEO Delivery: 3.6 MT GEO retrieval: 1.5 MT COST AND SCHEUDLE SUMMARY The cost estimate summary is shown in Table VI-E-7 as provided by Ms. Debbie Webb of the Resources Management Office. Total DDT&E for the two stages is estimated to be $478M (1976 dollars) and the total first unit cost is estimated to be $31M. The nominal development schedule is shown on Figure VI-E-8, as extracted from the Boeing FSTSA study (Phase I Extension Technical Report, December 9, 1975). The schedule includes a fluids transfer technology program to support design and development of on-orbit refueling systems and a stage-to-stage docking/connect system technology program.
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