The Mark 84 or BLU-117[2] is an American general-purpose bomb. It is 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. At the time, it was the third largest bomb by weight in the US inventory behind the 15,000-pound (6,800kg)BLU-82 "Daisy Cutter" and the 3,000-pound (1,400kg)M118 "demolition" bomb. It is currently sixth in size due to the addition of the 5,000lb (2,300kg)GBU-28 in 1991, the 22,600lb (10,300kg) GBU-43/B Massive Ordnance Air Blast bomb (MOAB) in 2003[citation needed], and the 30,000lb (14,000kg)Massive Ordnance Penetrator.
An aviation ordnance technician handling the bomb body of a "thermally protected" (insulated to slow cook-off time in case of fire) Mark 84 aboard the USSGeorge WashingtonSailors remove hoisting sling from a crate containing a pair of Mark 84 bomb bodies. Tailfins and fuzes have not yet been fitted
The Mark 84 has a nominal weight of 2,000lb (907kg), but its actual weight varies depending on its fin, fuze options, and retardation configuration, from 1,972 to 2,083lb (894 to 945kg). It is a streamlined steel casing filled with 945lb (429kg) of Tritonal high explosive.[1]
The Mark 84 is capable of forming a crater 50 feet (15m) wide and 36ft (11m) deep. It can penetrate up to 15 inches (38cm) of metal or 11ft (3.4m) of concrete, depending on the height from which it is dropped, and causes lethal fragmentation to a radius of 400 yards (370m).[3]
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-27Pavewaylaser-guided bombs, GBU-15 electro-optical bomb, GBU-31 JDAM and Quickstrike sea mines.[4] The HGK is a Turkish guidance kit used to convert 2000-lb Mark 84 bombs into GPS/INS guided smart bombs.[5]
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.
"Mk84 General Purpose Bomb". Federation of American Scientists. 23 April 2000. Archived from the original on 6 November 2010. Retrieved 1 September 2010.
Don, Holloway (March 1996). "STEALTH SECRETS OF THE F-117 NIGHTHAWK: Its development was kept under wraps for 14 years, but by 1991, the F-117 nighthawk had become a household word". Aviation History. Harrisburg, Pennsylvania: Cowles Magazines. ISSN1076-8858.
"Mk 65 Quick Strike Mine". Federation of American Scientists. 8 December 1998. Archived from the original on 18 September 2010. Retrieved 1 September 2010.
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