- Evolved Expendable Launch Vehicle
The Evolved Expendable Launch Vehicle (EELV) program is a
United States government, primarily a Department of Defense–sponsored effort begun in the 1990s. Its goal is to develop at least one family of space launch vehicles, that would meet the long term needs of the military and fulfill commercial and government need for cost-efficient and reliable access to Earth orbit.
The U.S. Air Force assembled its initial blue print for the EELV in 1994, following many years of government funded studies into an improved system and architecture, which was intended to replace most if not all existing “legacy” spacelifters (e.g.
Delta II, Atlas II/Centaur, Titan IV, etc.). The architecture called for the spacelifter to be based on standardized fairings, liquid core vehicles, upper stages, and solid rockets. The standard payload interface was also proposed as another way to save money and improve efficiency.
The initial bids came from four major defense contractors
Lockheed Martin, Boeing, McDonnell Douglas, and Alliant Techsystems. Each of the bids had a variety of different concepts. One of the contractors, Boeing, initially proposed utilizing the Space Shuttle Main Engines(SSME). ["Boeing Banks on SSME For Air Force Contract," Space News, 1 May 1995, page 2.] McDonnell Douglas merged with Boeing in 1997 and used its Delta IV spacelifter for their EELV proposal.
Boeing and Lockheed Martin were both collectively awarded US$ 100 million for the final phase of the bid. Both companies built their designs around modularization, standardization and minimizing the amount of equipment and using proven, reliable and simplified systems. Boeing developed the
Common Booster Core(CBC) that would be the center of the Delta IV. Lockheed Martin would do something similar with the Atlas Vbut call it a Common booster. Fact|date=June 2008
Boeing was found to be in possession of proprietary documents from Lockheed Martin. To end
litigationboth companies came to an agreement to join forces and form United Launch Alliancejoint venture. Each will have a 50-50 stake in this venture.Fact|date=June 2008
Delta IV rocket
Expendable launch system
* [http://www.globalsecurity.org/space/systems/eelv.htm EELV on Global Security]
* Lockheed Martin's [http://www.lockheedmartin.com/ssc/commercial_launch_services/launch_vehicles/AtlasV400Series.html Atlas V 400-series] , [http://www.lockheedmartin.com/ssc/commercial_launch_services/launch_vehicles/AtlasV400Series.html Atlas V 500-series] pages
* [http://www.boeing.com/defense-space/space/delta/delta4/delta4.htm Boeing's Delta IV page]
* [http://www.ulalaunch.com United Launch Alliance (ULA) page]
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