aae 450 spring 2008 stephanie morris 3/27/08 propulsion final slides
TRANSCRIPT
AAE 450 Spring 2008
Stephanie Morris3/27/08
PropulsionFinal Slides
AAE 450 Spring 2008
Propulsion
Aircraft LaunchWhite Knight was chosen as the aircraft carrier for our launch vehicle.
Maximum Altitude Maximum Payload Initial Launch Vehicle
Velocity
15000 m 3075 kg 59.72 m/s
White Knight Specifications:
Cost Breakdown:
Cost per hour ($/hr) Total Cost per launch
$4,410 $352,800
Assuming an 8 hour work day, 3 days for flight simulation and 7 days for launch preparation, the aircraft is leased for 80 hours.
AAE 450 Spring 2008
Propulsion
Risk AnalysisHybrid Propellant
Solid Propellant Liquid Propellant Hybrid Propellant
Mass of Propellant
0.12 % 0.734 % 0.854 %
Mass flow rate 1.0 % 0.4923 % 1.4923 %
For hybrid propellants, we cannot find historical standard deviations. The two percent deviations for liquid and solid propellant are added together to calculate a hybrid propellant percent deviation.
Percent Deviations for Each Propellant Type
AAE 450 Spring 2008
ReferencesDietz, William E., Suhs, Norman E. “Pegasus User’s Guide”. Stuart E. Rogers NASA
Ames Research Center. [www.orbital.com/NewsInfo/Publications/peg-user-guide.pdf]
Heister, S., D., Davis, R., J., “Predicting Burning Time Variations in Solid Rocket Motors,” Journal of Propulsion and Power, Vol. 8, No. 3, 1992, pp. 568.
Martin Company, “The Vanguard Satellite Launching Vehicle”, Engineering Report No.11022. April 1960, pp. 26, 208.
Scaled Composites, “Tier One – Private Manned Space Program,” Scaled Composites LLC. [http://www.scaled.com/projects/tierone. Accessed 1/19/08-1/23/08.]
Williams, Bob, Sales representative of Scaled Composites. “Email Conversation,” Dates 1/22/08 through 1/31/08.
Propulsion
AAE 450 Spring 2008
Propulsion
Existing ModificationsWhite Knight L-1011-100
Stargazer F-15C/D
Existing Launch Vehicle
SpaceShipOne Pegasus ASM-135 AST
Payload (kg) 3,629 36,800 1,180
Altitude (m) 15,240 11,890 11,582
Estimated Dimensioning
8.2 m length x 8.2 m span
17.1 m length x 7.9 m span
3.66 m length x .53 m span
Assumption: • Launch vehicle will be a similar shape to pre-existing vehicle and have
the similar performance results.
AAE 450 Spring 2008
Propulsion
Cost AnalysisWhite Knight L-1011-100
Stargazer F-15C/D
Leasing Cost$26,460 per launch*
(@$4410/hr)Unavailable Unavailable
Purchase Cost Unavailable $30,000,000 $42,520,000
*Insurance Cost (White Knight) Need $5 million coverage $125,000 for 2 months of insurance Does not include insurance needed for the launch vehicle
AAE 450 Spring 2008
Liquid Propellant – Percent Deviations
Average ValueStandard Deviation
Percent Deviation
Mass of Propellant
16,351 kg 120 0.734
Mass Flow Rate 110.7 kg/s 0.545 0.4923
Risk Analysis