Lunar Descent Hybrid Propulsion System Inert Mass Finals

Lunar Descent – Hybrid Propulsion System Inert Mass Finals -100 g Case - 10 kg Case - Arbitrary Case Lunar Descent – Thermodynamic Analysis on the Prop System Lunar Transfer – Chemical Alternative Week 13 Presentation Thursday, April 9 th, 2009 1 Saad Tanvir Propulsion Group

Propulsion System Mass Finals 100 g Payload case (Ball) 10 kg Payload case (Hopper) Propellant mass = 78. 2 kg Propulsion System Inert mass = 29. 9 kg Total Prop System Mass = 108. 1 kg Propellant mass = 121. 2 kg Propulsion System Inert mass = 45. 4 kg Total Prop System Mass = 166. 6 kg Arbitrary Payload case (Falcon 9) Propellant mass = 1783. 62 kg Propulsion System Inert mass = 227 kg Total Prop System Mass = 2010. 62 kg 2 Saad Tanvir Propulsion Group

100 g – Hybrid Propulsion System Mass Breakdown 3 Saad Tanvir Propulsion Group

10 kg – Hybrid Propulsion System Mass Breakdown 4 Saad Tanvir Propulsion Group

Large payload – Hybrid Propulsion System Mass Breakdown 5 Saad Tanvir Propulsion Group

Propellant Tank Specifications 6 Saad Tanvir Propulsion Group

Pressurant Tank Specifications 7 Saad Tanvir Propulsion Group

Hydrogen Peroxide Tanks - Thermodynamic Analysis Assumptions: Tank operating Temperature = 283 K (50 F) Surrounding Temperature = 2. 73 K ΔT = 280. 3 K Q: Rate of Heat transfer [W] A: Area of Cross section of the tank [m 2] k: Thermal Conductivity [0. 044 W/m. K] ΔT: Temperature Difference [K] t: Thickness of the blanket [200 mm] Power Required ~ 35 W 8 Saad Tanvir Propulsion Group

Lunar Descent – Thermodynamic Analysis on Prop System Temperature Drop < 5 K No power required to heat the propulsion system during Lunar Descent 9 Saad Tanvir Propulsion Group

Propellant Tank – Operating Pressure Pchamber = 2. 07 MPa ∆Pdynamic = ½�� v 2 ~ 0. 072 MPa ∆Pfeed (Upper bound) ~ 0. 05 MPa ∆Pcool ~ 0. 15 pc = 0. 31 MPa ∆Pinjector ~ 0. 3 pc = 0. 62 Mpa Ptank ~ 3. 07 MPa 10 Saad Tanvir Propulsion Group

Lunar Transfer: Chemical Alternative Significant mass savings using the Electric Propulsion system 11 Saad Tanvir Propulsion Group