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OTV Attitude Propulsion

OTV Attitude Propulsion. Thursday, January 22, 2009. Assumptions Total maneuver impulse : 6400 N*s Use shortest moment arm : 1.5m ISP lower for pulse mode : ~210 sec Hydrazine Capabilities Total Impulse: 15,000 – 561,388 sec Number of Cycles: 609- 402,000 Reliability: Up to 420,000 pulses

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OTV Attitude Propulsion

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  1. OTV Attitude Propulsion Thursday, January 22, 2009 Ryan Lehto, Propulsion

  2. Ryan Lehto Propulsion • Assumptions • Total maneuver impulse : 6400 N*s • Use shortest moment arm : 1.5m • ISP lower for pulse mode : ~210 sec • Hydrazine Capabilities • Total Impulse: 15,000 – 561,388 sec • Number of Cycles: 609- 402,000 • Reliability: Up to 420,000 pulses • Future Optimizations • Fuel Usage/Fuel Efficiency • Thruster Placement

  3. Preliminary Sizing Ryan Lehto, Propulsion • OTV Maneuvering Tanks • One Hydrazine Attitude Control System • Four Banks of Four Thrusters => 16 total. • Cost: Fuel ~$1100 • Heritage Information • Apollo Lander Used 489N Thrusters

  4. Back-Up Slides Complied by astronautix.com from Aerojet Documents Ryan Lehto, Propulsion

  5. Ryan Lehto, Propulsion

  6. Ryan Lehto, Propulsion Hydrazine $160/lb Source: Defense Energy Support Center – FY 2009 Data Mprop= I/Isp*g0

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