1. AAE450 Senior Spacecraft Design Atul Kumar Week 1: January 18 th, 2007 Aerodynamics Team Entry vehicle analysis 1

2. AAE450 Senior Spacecraft Design Entry Requirements Deceleration –Too much deceleration can injure the vehicle and the crew. –Too less can cause the vehicle to bounce back in space. Heating –Vehicle should be capable of withstanding extremely high aerodynamic heat loads during entry. Accuracy –Required to navigate and guide the vehicle through the entry corridor. –Prevent Overshoot and Undershoot boundary 2

3. AAE450 Senior Spacecraft Design Different shapes Aeroshell - Low L/D ratio - Moderate G’s - Low heat load, q s - Consists of a backshell and a heat shield. Image Credit: NASA- JPL http://marsrover.nasa.gov/mission/spacecraft_edl_aeroshell.html Cross section view of the Mars taxi with the rovers inside the Aeroshell. Original drawing by Atul Kumar 3

4. AAE450 Senior Spacecraft Design Different shapes Lifting body - High L/D ratio - Low G’s - High heat load - Smooth landing - Low impact velocity - Vertical take off capability 4 Mars entry vehicle carrying the Mars taxi, the rovers and the crew based on the space shuttle geometry. Original drawing by Atul Kumar

5. AAE450 Senior Spacecraft Design Backup slides 5 L(m)b (m)h(m)Volume (m^3)Area (m^2) Mars taxi + capsule5.75 10.0533333 Manned rovers3332 x 92 x 6 Unmanned rovers31.51.752 x 72 x 4.5 Aeroshell Approx. Area of the Heat shield ~ 1414 m 2 Volume = 3535 m 3 Parachute diameter = 52.7374 m

6. AAE450 Senior Spacecraft Design 6 Backup slides

7. AAE450 Senior Spacecraft Design References Larson, Wiley J., Pranke Linda K. Human Spaceflight Mission Analysis and Design, pgs 279, 314-315 Mars Exploration Rovers Mission: The Mission http://marsrover.nasa.gov/mission/spacecraft_edl_aeroshell.html Technical overview of the space shuttle orbiter http://www.columbiassacrifice.com/&0_shttlovrvw.htm AAE 450 Spring 2005, Project Legend- Final Design Report 7