Lunar Descent Slide Suggestions & Questions John Aitchison March 26th, 2009 [John Aitchison] [Mission Ops]

[John Aitchison] [Mission Ops] 100g Descent Action Time (s) Thrust (N) Radial Burn 0 - 176.2 1150 Rotation 176.2 - 181.3 115 Vertical Burn 181.3 - 196.4 Coast Landing 196.4 - 205.2 131 More detailed action list? Depict points where “Action” changes? 3-D/Landing Site? [John Aitchison] [Mission Ops]

[John Aitchison] [Mission Ops] 3-D 3 or 4 slides: 3-D overview, 2-D descent trajectory, hop/hover trajectory slide, final slide depicting overview of lander structure and masses on the lunar surface [John Aitchison] [Mission Ops]

[John Aitchison] [Mission Ops] 10kg Descent Trajectory Action Time (s) Thrust (N) Radial Burn 0 - 177.9 1650 Rotation 177.9 - 183.8 165 Vertical Burn 183.8 - 199.3 Coast Landing 199.3 - 208.1 196 [John Aitchison] [Mission Ops]

Arbitrary Descent Trajectory Action Time (s) Thrust (N) Radial Burn 0 - 169.9 34500 Rotation 169.9 - 174.8 3450 Vertical Burn 174.8 - 188.8 Coast Landing 188.8 – 193.1 3890 [John Aitchison] [Mission Ops]

[John Aitchison] [Mission Ops] Backup Slides [John Aitchison] [Mission Ops] 6

[John Aitchison] [Mission Ops] 100g Descent Propellant Propellant Mass (kg) De-Orbit Attitude Propellant Needed 0.36 1150N Burn Propellant Used 70.12 115N "Coast" Propellant Used 0.19 Descent Propellant Used 70.3 Descent Propellant Left 0.2 Attitude Descent Propellant Used 3.15 Attitude Descent Propellant Left 0.06 Contingency Propellant 1.83 Unusable Propellant 2.27 [John Aitchison] [Mission Ops] 7

100g Overview from Integrated Code Item Mass (kg) Propellant Mass in LLO 78.16 Inert Mass in LLO 78.59 Mass in LLO 156.76 Mass on Lunar Surface 82.95 [John Aitchison] [Mission Ops] 8

[John Aitchison] [Mission Ops] 10 kg Descent Propellant Propellant Mass (kg) De-Orbit Attitude Propellant Needed 0.5 1650N Burn Propellant Used 101.71 165N "Coast" Propellant Used 0.31 Descent Propellant Used 102.02 Descent Propellant Left 0.28 Attitude Descent Propellant Used 4.57 Attitude Descent Propellant Left 0.06 Contingency Propellant 1.58 Unusable Propellant 3.52 [John Aitchison] [Mission Ops] 9

10kg Overview from Integrated Code Item Mass (kg) Propellant Mass in LLO 121.22 Inert Mass in LLO 106.63 Mass in LLO 227.85 Mass on Lunar Surface (before hop) 120.76 Mass on Lunar Surface (after hop) 112.13 [John Aitchison] [Mission Ops]

Arbitrary Descent Propellant Mass (kg) De-Orbit Attitude Propellant Needed 9.46 34500N Burn Propellant Used 2022.49 3450N "Coast" Propellant Used 5.42 Descent Propellant Used 2027.91 Descent Propellant Left 0.49 Attitude Descent Propellant Used 90.76 Attitude Descent Propellant Left 0.54 Contingency Propellant 10.99 Unusable Propellant 66.34 [John Aitchison] [Mission Ops]

Arbitrary Overview from Integrated Code Item Mass (kg) Propellant Mass in LLO 2286.09 Inert Mass in LLO 2258.89 Mass in LLO 4544.98 Mass on Lunar Surface 2338.37 [John Aitchison] [Mission Ops]