47 The following is a list of all WBS Elements supporting this phase, including how they compare to both design reference systems. Note that WBS Elements map to either the components of this phase or to the specifications which serve as inputs to the components. Table 10. Summary of all WBS Elements in the Assemble ConOps Phase WBS Elements RD1 RD2 Sources Assembly time per module (hours) 0.67 0.63 Aerospace, citing ISS and Orbital Express as analogs. Given launch vehicle fairing limitations, the Planar Array cannot be unfurled and must be assembled on orbit. Modules assembled per servicer per month 1095 1152.631579 How many modules a single servicer can assemble in one month of continuous operation. Total assembly time (work months, 1 servicer) 1336.073059 1735.159817 How many months it would take a single servicer to assemble the entire system under continuous operation. Servicer mass (kg) 2,800.00 2,800.00 https://nssdc.gsfc.nasa.gov/nmc/spa cecraft/display.action?id=2020-056B First Servicer Cost ($) $1,000,000,000.00 $1,000,000,000.00 Aerospace, citing (Messier, 2020). Number of servicers 17 15 Aerospace, Mankins, Sasaki, NASA OTPS amended. Servicer Manufacturing Learning Rate 0.85 0.85 Aerospace assessment of analogs. Time to assemble SBSP system (months) 89 152 Simple model given launch cadence, transit times, payload capacity, minimizing servicer downtime. Maximum Modules per Starship 25000 20000 Starship payload capacity / module mass Module: Servicer total ratio 86,058.82 133,333.33 Total servicers to modules (number of servicers determined using assembly model to minimize servicer downtime) Assembly time of averaged ratio of modules to servicers (years) 6.55 9.64 Number of Servicers per Payload 0.288155129 0.149372635 How many servicers there are in a single payload, average. Assemble ConOps tab assumes earlier payloads carry more servicers. Time to refuel (months) 1 1 Estimate, does not consider cryogenic boiloff in orbit. Orbital transfer time (months) 1 1 Output of first order delta v calculation
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