Figure VI-8.- Crew module concept. Results of a parametric sizing study indicate that, although the 1-1/2 stage candidate required less LEO start-burn mass, the commonstage (two identical stages) candidate may provide more versatility to the transportation fleet with its capabilities for operation as a single stage (each stage individually), its total reusability to LEO, GEO sortie missions operations, and GEO refueling of second stage for return to LEO. In addition, the individual stages are compatible with the Shuttle payload bay. The sizing mission for the POTV is assumed to be the GEO manned sortie mission with total reusability and turnaround at LEO.
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