1. AAE450 Senior Spacecraft Design Catherine Frey Week 8: March 8 th, 2007 Propulsion Group, Transfer Vehicle Group, Mars Launch Vehicle Group, aM/aE/dM/dE Groups TV/MLV Propellant Masses and Engine Configurations Frey 1

2. AAE450 Senior Spacecraft Design TV Propellant/Engine Frey 2 Order of Missions: 1 – TV 1 2 – TV 2 (1) 3 – TV 3 (1) 4 – TV 2 (2) 5 – TV 4 (1) 6 – TV 3 (2) 7 – TV 2 (3) 8 – TV 4 (2) 9 – TV 3 (3) TVMissionm prop (mt) 11168 21277 2157 3207 31216 2218 3244* 41184 2225* * Propellant masses calculated using approximate ΔV values. Stages become reusable beginning with TV 4 Mission 1 3 SSMEs Burn time 480 s Max Thrust Possible 6834 kN Max Thrust Required 1195 kN

3. AAE450 Senior Spacecraft Design MLV Propellant/Engine MissionPayload (mt)# Launches 149.4 mt1 297.8 mt1 3283 mt2 4309 mt2 5350 mt2 Frey 3 Final # Prop Tanks4 m prop 621 mt m payload 200 mt 3 SSMEs Max Thrust Possible 6834 kN Max Thrust Required (M5) 6768 kN MLV CAD by Matt Fox

4. AAE450 Senior Spacecraft Design Back-Up Slides Frey 4

5. AAE450 Senior Spacecraft Design Mass/Thrust Calculations For known m PL : Thrust: For known m prop : Frey 5

6. AAE450 Senior Spacecraft Design Inbound TV Calculations Frey 6

7. AAE450 Senior Spacecraft Design Outbound TV Calculations Frey 7

8. AAE450 Senior Spacecraft Design TV Engine Analysis Three SSMEs provide almost six times the maximum thrust required by the TV during any given mission. It is necessary to have this many engines, however, for redundancy, as well as to keep the TV balanced. Frey 8

9. AAE450 Senior Spacecraft Design MLV Propellant Calculations Structures Values Mass Values Launch Values Frey 9

10. AAE450 Senior Spacecraft Design MLV Engine Analysis Max Thrust Required (mission 5) –6768 kN Max Thrust Provided (per launch) –6834 kN MLV missions 3, 4 and 5 necessitate two launches apiece because they require the launch of more payload than can fit in one MLV. The thrust required by mission 5 is the greatest, and it can still be handled by one SSME. The extra engines are located on the vehicle for redundancy and balance, should one engine go out. Frey 10

11. AAE450 Senior Spacecraft Design References Hrbud, Ivana. Rocket Propulsion: AAE 439. Ch4-6 - Ch4-8. Landau, Damon F. Strategies for the Sustained Human Exploration of Mars. Diss. Purdue Univ., 2006. Sutton, George P., and Oscar Biblarz. Rocket Propulsion Elements. Seventh ed. John Wiley & Sons, Inc., 2001. 28-29. Wade, Mark. “SSME." Encyclopedia Astronautica. Astronautix. 6 Mar. 2007. Frey 11