1. AAE450 Spring 2009 Brian Erson Attitude Control Systems Trans Lunar Phase Thruster Analysis [Brian Erson] [Attitude] 1

2. AAE450 Spring 2009 [Brian Erson] [Attitude] 2 Thruster Analysis 100g10kgArbitrary Added Inert mass (kg)1.9243.0213.84 Added Volume (m^3)4.3x10 -6 7.88x10 -5 5.97x10 -4 Cost savings($)7000600038000 Consultation with Purdue Hybrid(H202) Rocket Team led to development of an alternate OTV attitude control system System consists of 4 small H202 tanks enclosed within OTV Each system is independent All payload cases can be developed in-house for a fraction of purchase cost

3. AAE450 Spring 2009 [Brian Erson] [Attitude] 3 Reaction Wheel Update Payload DeviceManufacturerMass (kg)Size (cm) Power Required peak (W) Max Torque (mNm) 100g VF MR 4.0 (4) Valley Forge Composites2.6 (each) 20 x10 (each)76 (total)20 (each) 10kg VF MR 10.0 (4) Valley Forge Composites5.0 (each) 25 x15 (each)120 (total)30 (each) Arbitrary VF MR 19.6 (4) Valley Forge Composites10.5 (each) 39 x17 (each)280 (total)260 (each) Each Reaction Wheel had to be upgraded within each payload to account for increases in system mass Relevant changes to note: 100g10kgArbitrary Mass Increase (kg)4.49.622 Power Increase (W)2044160

4. AAE450 Spring 2009 [Brian Erson] [Attitude] 4 Backup Slide 1 Cost Savings Calculation: 100g General Kinetics Cost for 4 – 1N thrusters:$12,000 In-house Manufacturing cost:$5,000 Cost Savings:$7,000 10kg General Kinetics Cost for 4 – 1N thrusters:$12,000 In-house Manufacturing cost:$6,000 Cost Savings:$6,000 Arbitrary General Kinetics Cost for 4 – 13N thrusters:$48,000 In-house Manufacturing cost:$10,000 Cost Savings:$38,000

5. AAE450 Spring 2009 [Brian Erson] [Attitude] 5 Backup Slide 2 Inert Mass Calculations Density of H202:1.11 kg/L Mass of aluminum tank per.001 m^3:3.68kg Kg(prop) = massflow*(sec/thrust)*thrusts Kg(tank) = (3.68/.001)*volumeH202 100g 4 – 0.0048kg H202 Tanks0.064kg 4 – 0.02N H202 Thrusters0.36kg Feed Lines, Valves1.5kg Total Inert Mass1.924kg 10kg 4 – 0.315kg H202 Tanks1.16kg 4 – 0.03N H202 Thrusters0.36kg Feed Lines, Valves1.5kg Total Inert Mass3.02kg Arbitrary 4 – 2.65kg H202 Tanks8.8kg 4 – 0.26N H202 Thrusters0.36kg Feed Lines, Valves1.5kg Total Inert Mass13.84kg