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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク National Launch System ： ウィキペディア英語版 National Launch System The National Launch System (or New Launch System) was a study authorized in 1991 by President George H. W. Bush to outline alternatives to the Space Shuttle for access to Earth Orbit. Shortly thereafter, NASA asked Lockheed Missiles and Space, McDonnell Douglas, and TRW, to perform a ten-month study. A series of launch vehicles was proposed, based around the Space Transportation Main Engine (STME) liquid-fuel rocket engine, a proposed simplified, expendable version of the Space Shuttle Main Engine (SSME). The largest of three proposed vehicles was designated NLS-1 and used for its core stage a modified Space Shuttle External Tank which would feed liquid Oxygen and liquid Hydrogen to four STMEs attached to the bottom of the tank. A payload or second stage would fit atop the core stage, and two detachable Shuttle Solid Rocket Boosters would be mounted on the sides of the core stage as on the Shuttle. Period illustrations suggest that much larger rockets than NLS-1 were contemplated, using multiples of the NLS-1 core stage. ==Program cancellation== The NLS program did not venture beyond the planning stages and did not survive the ascendancy of the Clinton administration in 1993. Perhaps the inevitable was already clear by 1992 with the selection of Daniel S. Goldin to replace Vice Admiral Richard H. Truly as NASA administrator. Goldin championed the motto, "faster, better, cheaper," which may not have appeared to fit the ambitious NLS vision. A NASA history from 1998 offers that reusable Single-stage-to-orbit (SSTO) rockets and space planes such as the DC-X and X-33 seemed attainable and represented smaller, simpler alternatives to the sprawling Shuttle program. NLS, by contrast, was more of a continuation of the Shuttle legacy. Whether it was ever explicitly stated, by the beginning of the Clinton administration, the expensive Space Shuttle and planned Space Station Freedom programs had enough momentum to continue, and the SSTO projects showed enough promise to fund. There was no budget left for another big program, the National Launch System. 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「National Launch System」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.