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A launch escape system is a crew safety system connected to a space capsule, used to quickly separate the capsule from its launch vehicle rocket in case of a launch abort emergency, such as an impending explosion. Such systems are usually of two types: *A solid-fueled rocket, mounted above the capsule on a tower, which delivers a relatively large thrust for a brief period of time to send the capsule a safe distance away from the launch vehicle, at which point the capsule's parachute recovery system can be used for a safe landing on ground or water. The tower and rocket are jettisoned from the space vehicle in a normal flight at the point where it is either no longer needed, or cannot be effectively used to abort the flight. These have been used on the Mercury, Apollo, and Soyuz capsules. *The crew are seated in ejection seats as used in military aircraft; each crewmember returns to Earth with an individual parachute. Such systems are effective in a limited range of altitudes and speeds. These have been used on the Vostok and Gemini capsules. The system is typically controlled by a combination of automatic rocket failure detection, and a manual backup for the crew commander's use. Escape systems have not proven to be practical for more complex spacecraft designs such as the Space Shuttle, mainly because most crew members cannot be seated next to escape hatches. ==History== The idea of using a rocket to remove the capsule from a space vehicle was developed by Maxime Faget in 1958. The system, using the tower on the top of the space capsule to house rockets, was first used on a test of the Project Mercury capsule in March 1959. Historically, LESes were used on American Mercury and Apollo spacecraft. Both designs used a solid-fuel rocket motor. The Mercury LES was built by the Grand Central Rocket Company in Redlands, California (which later became the Lockheed Propulsion Company). Apollo used a design that had many similarities to the Mercury system. Launch Escape Systems continue to be used on the Russian Soyuz and Chinese Shenzhou programme spacecraft. The SpaceX-designed Dragon spacecraft uses a liquid fueled launch abort system integrated to the capsule to minimize spacecraft costs. The LES may be used while the launch vehicle is still on the launch pad, or during its ascent. 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「launch escape system」の詳細全文を読む スポンサード リンク
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