Water Electrolysis for Propulsion of a Crewed Mars

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Water Electrolysis for Propulsion of a Crewed Mars ( water-electrolysis-propulsion-crewed-mars )

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IV. Comparison of Architectures Assembly times are estimated based on the number of launches required to assemble before departure, compared to the assembly time of the DRA-5, 120 days. Tables IV-2 through IV-4 uses the following cost-per-launch figures: • SLS Block 2, no recent cost is available and there are a wide range of estimates: o $500M according to an interview with the SLS deputy project manager in 2012.21 o $1B according to an independent estimation.11 The article mentions a $5B estimate, but this includes developmental costs that have already been spent on the program as well as the cost of Orion. • FH: o $90M for up to 8,000 t to GTO according to SpaceX.22 Published figures for LEO and greater GTO payloads are not available. Intead, the FH carries nearly its maximum payload capability for each destination. So, the cost is scaled from the GTO launch capacity (26,700 t, or 3.34 times the 8,000 t for which a price is listed) for a price of approximately $300M. • F9: o $62M according to SpaceX.22 Table IIV-1: Comparison of Launches Required for Crewed Mars Architectures F9 1 0 0 0 0 0 0 0 0 FH 0 1 3 1 2 5or6 0 0 2 SLS 5 3 2 3 2 0 4 4 3 Launch Vehicle A: Baseline B: 450 s LL2 C: 450 s LL2 D: 450 s HEO E: 450 s HEO F: 450 s HEO G: 300 s LL2 H: 300 s HEO I: 300 s HEO Table IIV-2: Absolute Values of Mission Parameters for Crewed Mars Architectures Parameter A: Baseline B C D E F G H I Launch Costs ($B) Min Estimate Max Estimate ($B) Assembly Time (d) 2.5062 1.8 1.9 1.8 5.062 3.3 2.9 3.3 120607260 1.6 1.5 2.0 2.6 1.8 4.0 60 120 72 2.0 2.1 4.0 3.6 72 72 -0.5 -0.4 -1.0 -1.4 -48 -48 0.8 0.84 0.8 0.72 0.6 0.6 Table IIV-3: Absolute Comparison of Mission Parameters for Crewed Mars Architectures Parameter A: Baseline B C D E F G H I Launch Costs ($B) 0 Min Estimate Max Estimate ($B) 0 Assembly Time (d) 0 -0.7 -0.6 -0.7 -0.9 -1.0 -0.5 -1.7 -2.1 -1.7 -2.4 -3.2 -1.0 -60 -48 -60 -60 0 -48 Table IIV-4: Relative Comparison of Mission Parameters for Crewed Mars Architectures Parameter A: Baseline B C D E F G H I Launch Costs ($B) 1.0 Min Estimate Max Estimate ($B) 1.0 Assembly Time (d) 1.0 0.72 0.76 0.72 0.64 0.60 0.8 0.66 0.58 0.66 0.52 0.36 0.8 0.5 0.6 0.5 0.5 1.0 0.6 22 American Institute of Aeronautics and Astronautics Downloaded by NASA LANGLEY RESEARCH CENTRE on January 30, 2018 | http://arc.aiaa.org | DOI: 10.2514/6.2018-1537

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