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The Space Launch Initiative (SLI) was a NASA and U.S. Department of Defense joint research and technology project to determine the requirements to meet all the nation’s hypersonics, space launch and space technology needs. The program began with the award of reusable launch vehicle study contracts in 2000. The primary goal of this research was to increase safety and reliability and to reduce overall costs associated with building, flying and maintaining the nation’s next generation of space launch vehicles. NASA anticipated that these advances would revitalize the nation’s space transportation capabilities, and dramatically improve NASA’s ability to conduct science and exploration missions in space.〔"The Next Generation Launch Technology Program" (wikisource). NASA, May 2003.〕|This program was ended with the cancellation of the X-33 and X-34 and the conclusion of the X-43 programs. NASA changed its focus to Constellation Program. The Space Launch Initiative Propulsion Office—managed by NASA’s Marshall Space Flight Center in Huntsville, Ala., -- sought to advance technologies and explore new avenues of space propulsion to develop safer, more reliable and affordable propulsion solutions. Four main engine candidates for a second generation reusable launch vehicle emerged, including two hydrogen-fueled (COBRA, RS-83, TR-106) and two kerosene-fueled (RS-84, TR-107) staged combustion engines. California Poly Pomona's Professor Steven Dobbs was the Lead Systems Engineer on the project, making significant use of the program as an example for failed systems engineering. == COBRA rocket engine == Propulsion system proposed by Pratt & Whitney-Aerojet Propulsion Associates to cover a wide range of thrust. This LH2/LOX reusable rocket engine was designed in 2003 to produce 4,500 kN thrust. Proposed as a long-life, moderate-to high-thrust, reusable booster engine that incorporated a safe, low-cost, low-risk, LH2/LOX single burner, using a fuel-rich, staged combustion cycle. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Space Launch Initiative」の詳細全文を読む スポンサード リンク
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