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Shuttle-Derived Launch Vehicle, or simply Shuttle-Derived Vehicle (SDV), is a term describing one of a wide array of concepts that have been developed for creating space launch vehicles from the components, technology and infrastructure of the Space Shuttle program. SDVs have also been part of NASA's plans several times in the past. In the late 1980s and early 1990s, NASA formally studied a cargo-only vehicle, Shuttle-C, that would have supplemented the crewed Space Shuttle in orbiting payloads. In 2005, NASA decided to develop the Ares I and Ares V launch vehicles, based in part on highly modified Shuttle components to replace the Space Shuttle, and enable exploration of the Moon and Mars. The agency also studied a third such vehicle, the Ares IV. As of April 2011, NASA's replacement vehicle for the Space Shuttle is an SDV, the Space Launch System. == Concepts == SDV concepts were proposed even before the Shuttle itself began flying. Proposed SDV concepts have included: * Replacing the winged Space Shuttle Orbiter with an uncrewed, expendable cargo pod ("side-mount style" SDV) * Removing the Orbiter and mounting an upper stage and payload atop the Space Shuttle external tank ("inline-style" SDV) * Adding a large cargo container to the rear of the external tank, allowing launches of bulky materials (Aft Cargo Carrier) * Replacing the Space Shuttle Solid Rocket Boosters (SRBs) with liquid rockets, including recoverable winged "flyback" boosters * Creating vehicles from one or more Space Shuttle Solid Rocket Boosters, usually with some kind of an upper stage * Removing the wings of an Orbiter at the end of its useful life, permanently attaching it to a Space Shuttle external tank, and launching the combination as a space station Several such concepts are of particular note: 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「Shuttle-Derived Launch Vehicle」の詳細全文を読む スポンサード リンク
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