1<#>AAE 450 Spring 2008

Stephen BluestoneMarch 20, 2008

PropulsionFinal Presentation Slides

1

2<#>

Engine Sizing The amount of propellant required for each

rocket/stage was determined in Model Analysis

Inert mass fraction, finert, was optimized between the structures and propulsion groups for final design

)1(

)1)(1)((

MRf

fMRmmm

inert

inertavionicspayp

3<#>

Engine Cost Cost of Engines calculated from equations

based on mass flow, thrust, and dry weight Cost equations are extrapolated from

historical valuesPayload 1st Stage

Engine Cost2nd Stage

Engine Cost3rd Stage

Engine CostTotal Engine

Cost

200g $679,720 $263,690 $79,930 $1,023,340

1kg $634,090 $209,930 $86,860 $930,880

5kg $1,138,700 $339,700 $80,900 $1,559,300

4<#>

Historical Failure Probability U.S. Solid Rocket Systems (Failures/Attempts)

– 6 / 412 (1.4%) Failures between 1980-20041

– 19 / 3382 (0.56%) Failures between 1964-19982

Solid Propulsion Failure Rates (Failures/Attempts)

– Upper Stage 0.0161 161/10000

– Monolithic 0.0025 25/10000– Segmented 0.0077 77/10000– Total 0.0056 56/10000

AAE 450 Spring 2008Propulsion – Propellants

5<#>

Catastrophic Failure Historically Solid Rocket failure results in

catastrophic failure 37% of the time (19 solid failures, 7 were catastrophic) [1964-1998]1

Solid Rocket Failure Rate (Failures/Attempts)

– Failure 0.0056, 56/10000– Catastrophic Failure 0.0021, 21/10000

AAE 450 Spring 2008Propulsion - Propellants

6<#>

References Nieroski, John S., and Friedland, Edward I., “Liquid Rocket

Engine Cost Estimating Relationships,” AIAA Paper 65-533, July 1965.

Humble, Ronald W., Henry, Gary N., Larson, Wiley J. “Hybrid Rocket Propulsion Systems,” Space Propulsion Analysis and Design, 1st ed. revised, Primis, New York, 1995

Chang, I-Shih., Tomei, Edmardo Joe., “Solid Rocket Failures in World Space Launches.” AIAA Paper 2005-3793, Joint Propulsion Conference and Exhibit, 41st, Tuscon, Az, July 10-13, 2005

Sauvageu, Donald R., Allen, Brian D., “Launch Vehicle Historical Reliability.” AIAA-1998-3979 AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 34th, Cleveland, OH, July 13-15, 1998