thruster array of 259 thrusters is suspended by cables and located at the vehicle center of gravity. Additional attitude thruster control packages are located at the structural extremities. The component mass breakdown is given in Table 2. The second option utilizes a silicon photovoltaic solar array in a planar configuration with no concentration reflectors. Round trip time from LEO-GEO-LEO is approximately 160 days which also allows two trips per year for each COTV. Ion bombardment thrusters of 120 cm diameter are used with an Isp of 7000 seconds and argon as the working fluid. Thruster modules of 296 electric thrusters each and an appropriate number of chemical thrusters are located at the four corners of the COTV. The component mass breakdown is given in Table 3. Transportation Fleet Requirements - Section L of this report provides a summary of the total transportation requirements for the installation of the orbital bases and of two 5 GW SPS. Requirements are expressed in terms of flights per year for each vehicle and fleet size for both the GaAlAs SPS and silicon SPS. Table 2 GaAlAs Independent Electric COTV Mass Breakdown
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