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Little Joe 1
Little Joe 1 (LJ-1) was a failed launch of a Little Joe solid fuel rocket that was designed to test the Mercury spacecraft Launch Escape and Recovery systems. The vehicle was in height, weighed approximately , and was in diameter with a fin span of . The Little Joe booster consisted of four Pollux and four Recruit clustered, solid-fuel rockets, could develop a thrust of , and could lift a maximum payload of . The escape system, using a Grand Central 1KS52000 rocket motor, weighed .
On August 21, 1959, LJ-1 was being prepared for launch from the Wallops Flight Facility, Wallops Island, Virginia. Suddenly, about a half hour before the scheduled launch, the escape rocket fired and pulled the Mercury spacecraft away from the launch pad. The spacecraft reached an apogee of and landed about 2000 feet away. The flight time was 20 seconds.〔(【引用サイトリンク】title=Project Mercury Unmanned Missions: LJ-1 )〕
According to the Sept. 18, 1959 accident report, the unexpected triggering of the launch escape system was caused by a transient or electrical leak;〔 analysis showed it to be due to the rapid-abort system being wired directly into the destruct arming busbar. The batteries were shipped from England to the U.S. uncharged and shorted; on charging at the pad, the batteries, when enough charge was reached, actuated the sequencer for the abort system, and sensing insufficient altitude, fired the squibs in the abort motor. Insufficient power in the batteries then failed to initiate the tower jettison motor and capsule parachute recovery charge, and both crashed into the sea.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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