Silicone, Cork, Silica Glass Fibers Previous Missions Mission Entry Speed (km/s) Max Temp (C) Material Galileo 47.38 15500 Carbon-Phenolic Apollo 11.17 2760 Phenolic Epoxy Resin Pathfinder 4.47 1650 Silicone, Cork, Silica Glass Fibers AGA 11.54 2250 Location Dependant 4/08/2003

Material Properties 4/08/2003

Design Factors Heating Duration  10-20 minutes Large Area  4x8m Heat Soak Increases Thickness of Ablator Large Area  4x8m Large Volume of TPS Weight Limits 4/08/2003

Design Algorithm Caclulate heating history for several points of aeroshell Choose materials for each point Size depth of TPS for each point Calculate TPS Volume  Mass Hand Mass over to Structures 4/08/2003