1. Advanced Space Exploration LEO Propellant Depot: Space Transportation Impedance Matching Space Access 2010 April 8-10, 2010 Dallas Bienhoff Manager, In-Space & Surface Systems 703-872-4004; dallas.g.bienhoff@boeing.com Space Access 2010 April 8-10, 2010 Dallas Bienhoff Manager, In-Space & Surface Systems 703-872-4004; dallas.g.bienhoff@boeing.com

2. Advanced Space Exploration LEO Propellant Depot Assembly and Operations 100324_LPD_GSFC_Servicing March 24-26, 2010 1 of 8

3. Advanced Space Exploration 100324_LPD_GSFC_Servicing A Depot-Enabled Reusable Cislunar Architecture: Matched Impedance – What is Launched is Landed March 24-26, 2010 2 of 8 Zero-g Crew Module Personnel Cargo Propellant Depot Tug Personnel Propellant Depot Tug Personnel Cargo Lander Personnel Propellant Cargo g-oriented Crew Module

4. Advanced Space Exploration 100324_LPD_GSFC_Servicing Systems Comprising an Impedance Matched Cislunar Architecture Low-cost launch provider Space X Falcon 9-3.6 shown 2 Modular Propellant Depots 180 and 90 t capacity LOx/LH Depot Tug with Propellant Carrier 9400 kg PC mass LOx/LH Reusable Aerobrake Transfer Stage GTO and/or GEO delivery LOx/LH March 24-26, 2010 3 of 8 Space Transfer Stage EML1 to Perilune delivery LOx/LH Lunar Lander Perilune to Surface LOx/LH Personnel Modules 0-g and g oriented

5. Advanced Space Exploration 100324_LPD_GSFC_Servicing A LEO Propellant Depot Operational Concept: Missions Not Constrained by Launch Capability Low-cost launch provider Space X Falcon 9-3.6 shown Ares V Earth Orbit Lunar Orbit Interplanetary Trajectories Reenter & Reuse RATS RPC EDS/LSAM March 24-26, 2010 4 of 8

6. Advanced Space Exploration Operational Flexibility Enabled With ISRU Case System A BCDEF G ARTVEarth Moon DT OutEarth Moon DT BackEarth MoonEarthMoon SRTVEarth Moon LSS OutEarth Moon LSS BackEarthMoon March 24-26, 2010 5 of 18 100324_LPD_GSFC_Servicing Lunar propellant can be provided for none, one, or all mission legs Selection can be dependent on Mission efficiency (prop/payload; prop needed/prop used) Price at depot Operational failures

7. Advanced Space Exploration Comparing Cislunar Options with Constellation Case Param A All Earth BCDE F LPD Earth G All Moon Const Expended 1 use each system Orion EDS Altair Prop – 20 t to 180 231195 Prop – 18 t from 182140120N/A Prop for crew 143142117226 Round Trip Payload 1118 N/A March 24-26, 2010 6 of 8 100324_LPD_GSFC_Servicing

8. Advanced Space Exploration Mission and Total Propellant Knowledge Needed to Define Economic Requirements March 24-26, 2010 7 of 8 100324_LPD_GSFC_Servicing Mission propellant defines sales volume Total propellant defines production required to meet sales Data for delivering 20 t to Moon Constellation shown for comparison

9. Advanced Space Exploration An “Impedance Matched” Cislunar Architecture… Matches transport capability to ETO launch capability Uses path specific systems Uses multi-mission systems for Space transportation Incorporates propellant depots at payload transfer nodes Can use propellant from Earth or Moon for any mission leg ISRU economic requirements driven by production versus use March 24-26, 2010 8 of 8 100324_LPD_GSFC_Servicing