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Ares I-X was the first-stage prototype and design concept demonstrator in the Ares I program, a launch system for human spaceflight developed by the United States space agency, NASA. Ares I-X was successfully launched on October 28, 2009. The project cost was $445 million. The Ares I-X vehicle used in the test flight was similar in shape, mass, and size to the planned configuration of later Ares I vehicles, but had largely dissimilar internal hardware consisting of only one powered stage. Ares I vehicles were intended to launch Orion crew exploration vehicles. Along with the Ares V launch system and the Altair lunar lander, Ares I and Orion were part of NASA's Constellation Program, which was developing the spacecraft for U.S. human spaceflight after the Space Shuttle fleet was retired. ==Test objectives== Ares I-X was the first test flight of a launch vehicle like the Ares I. The test flight objectives included:〔.〕 * Demonstrating control of a dynamically similar vehicle using control algorithms similar to those used for Ares I. * Performing an in-flight separation/staging event between an Ares I-similar First Stage and a representative Upper Stage. * Demonstrating assembly and recovery of an Ares I-like First Stage at Kennedy Space Center (KSC). * Demonstrating First Stage separation sequencing, and measuring First Stage atmospheric entry dynamics, and parachute performance. * Characterizing the magnitude of integrated vehicle roll torque throughout First Stage flight. The flight also had several secondary objectives, including: * Quantifying the effectiveness of the first-stage booster deceleration motors. * Characterizing induced environments and loads on the vehicle during ascent. * Demonstrating a procedure for determining the vehicle’s position to orient the flight control system. * Characterize induced loads on the Flight Test Vehicle while on the launch pad. * Assess potential Ares I access locations in the VAB and on the Pad. * Assess First Stage electrical umbilical performance. The Ares I-X flight profile closely approximated the flight conditions that Ares I will experience through Mach 4.5, at an altitude of about 130,000 feet (39,600 m) and through a maximum dynamic pressure (“Max Q”) of approximately 800 pounds per square foot (38 kPa). The Ares I-X flight profile resembled the uncrewed Saturn I flights of the 1960s, which tested the Saturn propulsion concept. By flying the vehicle through first-stage separation, the test flight also verified the performance and dynamics of the Ares I solid rocket booster in a “single stick” arrangement, which is different from the solid rocket booster’s then-current “double-booster” configuration alongside the external tank on the space shuttle.〔(【引用サイトリンク】title=NASA – NASA's Ares I-X Rocket )〕 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「Ares I-X」の詳細全文を読む スポンサード リンク
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