1. AAE450 Spring 2009 Translunar Orbit Transfer Vehicle (OTV): Propulsion System Setup for 100g & 10 kg Case Launch Vehicle Selection for Arbitrary Case Thermal Analysis of EP System Week 8 Presentation Thursday, March 5, 2009 Brad Appel Propulsion Group 1

2. AAE450 Spring 2009 GLXP Electric Propulsion System Setup Brad Appel Propulsion Group 2 S 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 10 11 From PCDU S/C Communication 9 9 Xenon System Thermal System Power / Intercomm 0.2 m No redundancies, no integration costs

3. AAE450 Spring 2009 The Falcon 9-Heavy is 6% cheaper than the Falcon 9 by cost per mass to LLO, but the Falcon 9H option may be ruled out for technical reasons. The team should focus analysis on the Falcon 9, but can’t rule out Falcon 9H yet. Brad Appel Propulsion Group Preliminary Design Considerations for OTV Arbitrary Payload 3

4. AAE450 Spring 2009 Backup Slides: Thruster Radiation Sleeve Brad Appel Propulsion Group 4 Radiates away waste heat from Hall Thruster 12 gauge Aluminum sheet metal with high emissivity paint Worked with Ian Meginnis

5. AAE450 Spring 2009 Brad Appel Propulsion Group Backup Slides: Xenon Thermal Analysis 5 Allowed temperature path of propellant Maximize storage pressure for volume efficiency (~ 150 bar) Maintain tank temperature for gaseous Xenon phase:  Balance heat due to radiation and pressure drop with a resistance heater Curve data from National Institute of Standards and Technology Temperature (K)

6. AAE450 Spring 2009 Brad Appel Propulsion Group Backup Slides: Industry Contacts 6  Busek – Bruce Pote –Hall thrusters, package deal for Prop System  Moog – Edward Bushway –Valves and feed system components  ATK Space Systems – Walter Tam –Xenon storage tanks  Mitsubishi Electric Co. – Osuga Hiroyugi –Alternative Hall Thruster (in development)  Mott Corp –Sintered flow restrictors  Arde Aerospace Propulsion Systems –Xenon storage tanks