Personnel Orbital Transfer Vehicle (POTV) - The POTV will be utilized to transport all personnel from LEO to GEO and return. To minimize passenger exposure to the VanAllen belt radiation, a trip time of less than one day is required. Therefore, conventional high thrust O2/H2 chemical propulsion is assumed. For SPS GEO construction, a passenger module may be carried as part of the payload of the COTVg. For purposes of this scenario in determining POTVg GEO trips required, the passenger only capability has been calculated and is limited by the down payload capability of stages. In addition, when the COTVq is utilized as the POTVC, the second stage drop tank is not expended at GEO, but is returned with the stage 2 core and hence the down propellant. The range of P0TVf characteristics is given as follows:
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