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The SM-68 Titan (individual variants later designated HGM-25 and LGM-25) was the designation for two American intercontinental ballistic missiles, which were members of the Titan family of rockets. These consisted of the Titan I and Titan II missiles, which were operational between 1962 and 1987, and were a major component of the United States fleet of missiles during the Cold War. Titan was originally built as a backup to the SM-65 Atlas. The Titan I used RP-1 and liquid oxygen propellant, resulting in a response time of around fifteen minutes, required to fuel the rocket and raise it to a launch position. It was replaced by the more powerful Titan II, which used nitrogen tetroxide and hydrazine, allowing it to be stored with propellant loaded, giving it a much shorter response time. ==Titan I== (詳細はTitan I was the first version of the Titan family of rockets. It began as a backup ICBM project in case the Atlas was delayed. It was a two-stage rocket propelled by RP-1 and liquid oxygen. Using RP-1 and LOX meant that the Titan I did not have a quick launch sequence. It took about fifteen minutes to load LOX on the first missile at a complex, raise it topside and launch it, with the other two missiles following at about eight-minute intervals. Titan I was operational from early 1962 to mid-1965. Several US Air Force units operated the Titan I: * 568th Strategic Missile Squadron, Larson AFB, Moses Lake, Washington * 569th Strategic Missile Squadron, Mountain Home AFB, Mt Home, Idaho * 851st Strategic Missile Squadron, Beale AFB, Marysville, California * 850th Strategic Missile Squadron, Ellsworth AFB, Rapid City, South Dakota * 451st Strategic Missile Wing (formerly 703rd) Lowry AFB, Denver, Colorado 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「SM-68 Titan」の詳細全文を読む スポンサード リンク
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