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The Mark 84 or BLU-117〔(【引用サイトリンク】url=http://www.saffm.hq.af.mil/shared/media/document/AFD-100127-159.pdf )〕 is an American general-purpose bomb, it is also the largest of the Mark 80 series of weapons. Entering service during the Vietnam War, it became a commonly used US heavy unguided bomb (due to the amount of high-explosive content packed inside) to be dropped, second only to the BLU-82 "Daisy Cutter" then in service and presently third only to the GBU-43/B Massive Ordnance Air Blast bomb (MOAB) currently in service. Pilots flying the F-117 Nighthawk over Iraq during the First Gulf War nicknamed it the "Hammer" (albeit fitted with the GBU-27 Paveway III kit for use specially by the ''Nighthawks''), for its considerable destructive power and blast radius.〔 ==Development== The Mark 84 has a nominal weight of , but its actual weight varies depending on its fin, fuze options, and retardation configuration, from . It is a streamlined steel casing filled with of Tritonal high explosive.〔 The Mark 84 is capable of forming a crater wide and deep. It can penetrate up to of metal or of concrete, depending on the height from which it is dropped, and causes lethal fragmentation to a radius of .〔 Many Mark 84s have been retrofitted with stabilizing and retarding devices to provide precision guidance capabilities. They serve as the warhead of a variety of precision-guided munitions, including the GBU-10/GBU-24/GBU-27 Paveway laser-guided bombs, GBU-15 electro-optical bomb, GBU-31 JDAM and Quickstrike sea mines. According to a test report conducted by the United States Navy's Weapon System Explosives Safety Review Board (WSESRB) established in the wake of the 1967 USS Forrestal fire, the cooking off time for a Mk 84 is approximately 8 minutes 40 seconds. 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「Mark 84 bomb」の詳細全文を読む スポンサード リンク
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