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The Business Case for Spiral Development in Heavy Lift Launch Vehicle SystemsPerformance capabilities of a specific combination of the Space Shuttle external tank and various liquid engines in an in-line configuration, two-stage core vehicle with multiple redesigned solid rocket motor strap-ons are reexamined. This concept proposes using existing assets, hardware, and capabilities that are already crew-rated, flight certified, being manufactured under existing contracts, have a long history of component and system ground testing, and have been flown for over 20 yr. This paper goes beyond describing potential performance capabilities of specific components to discuss the overall system feasibility-from end to end, start to finish-describing the inherent cost advantages of the Spiral Development concept, which builds on existing capabilities and assets, as opposed to starting up a "fresh sheet" heavy-lift launch vehicle program from scratch.
Document ID
Document Type
Preprint (Draft being sent to journal)
Farr, Rebecca A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Christensen, David L. (Christensen (David L.) Madison, Al, United States)
Keith, Edward L. (Keith (Edward L.) La Verne, CA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2005
Subject Category
Spacecraft Design, Testing and Performance
Report/Patent Number
AIAA Paper 2005-4181
Meeting Information
41st AIAA Joint Propulsion Conference(Tucson, AZ)
Distribution Limits
Public Use Permitted.

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