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The Ascent Propulsion System (''APS'') or ''LMAE'' (Lunar Module Ascent Engine) is a fixed thrust hypergolic rocket engine developed by Bell Aerosystems for use in the Apollo Lunar Module Ascent Stage. It used Aerozine 50 fuel, and N2O4 oxidizer. Rocketdyne provided the injector system, at the request of NASA, when Bell could not solve combustion instability problems.〔 ==Origins== The LMAE traces its origin to the earlier Bell Aerosystems engines (8096, 8247) used in the RM-81 Agena, the American rocket upper stage and satellite support bus developed by Lockheed initially for the canceled WS-117L reconnaissance satellite program. The Agena served as an upper stage for several defense, intelligence, and exploration programs: SAMOS-E, SAMOS-F (ELINT Ferret) and MIDAS (Missile Defense Alarm System) military early-warning satellites, Corona photo intelligence program, and the Ranger and Lunar Orbiter lunar probes. The Lockheed Agena target vehicle using the Bell 8247 engine was qualified for 15 restarts for NASA's Project Gemini. A total of 365 Agena rockets were launched by NASA and the US Air Force between February 28, 1959 and the last Agena D launched on 12 February 1987, configured as the upper stage of a Titan 34B.〔(【引用サイトリンク】title=HISTORY - AGENA AS OF 31 DEC67, VOLUME I )〕 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「Ascent Propulsion System」の詳細全文を読む スポンサード リンク
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