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The name Fat Man refers to the early design of the bomb because it had a wide, round shape. Fat Man was an implosion-type nuclear weapon with a solid plutonium core. The first of that type to be detonated was the Gadget in the Trinity nuclear test less than a month earlier on 16 July at the Alamogordo Bombing and Gunnery Range in New Mexico.
Little Boy in the bomb pit on Tinian island, before being loaded into Enola Gay ' s bomb bay. A section of the bomb bay door is visible on the top right. The Little Boy pre-assemblies were designated L-1, L-2, L-3, L-4, L-5, L-6, L-7, and L-11. Of these, L-1, L-2, L-5, and L-6 were expended in test drops.
Fat Man was the second nuclear weapon to be deployed in combat after the US dropped a 5-ton atomic bomb, called "Little Boy," on the Japanese city of Hiroshima.
Total weight of nuclear material and bomb was 98.8 - 100.2 kg Hiroshima's "Little Boy" gravity bomb: 13–18 54–75 Gun type uranium-235 fission bomb (the first of the two nuclear weapons that have been used in warfare). 64 kg of Uranium-235, about 1.38% of the uranium fissioned Nagasaki's "Fat Man" gravity bomb 19–23 79–96
The 1945 photo shows Manhattan Project physicist Harold Agnew holding the heart of one of the most devastating weapons in the world.
There were plans for further attacks on Japan following Hiroshima and Nagasaki. Groves expected to have another "Fat Man" atomic bomb ready for use on 19 August, with three more in September and a further three in October. [87] A second Little Boy bomb (using U-235) would not be available until December 1945.
Fat Man bomb, with liquid asphalt sealant sprayed on the casing's seams, is readied on Tinian. Parsons, as the weaponeer, was in command of the Hiroshima mission. With Second Lieutenant Morris R. Jeppson of the 1st Ordnance Squadron, he inserted the Little Boy's powder bags in the Enola Gay ' s bomb bay in flight. Before climbing to altitude on ...
A Project Alberta Advance Party was created, consisting of Sheldon Dike for Air Force liaison, Theodore Perlman for Little Boy, and Victor Miller and Harlow Russ for Fat Man. The rest of the Fat Man team prepared the "Gadget", the case-less Fat Man bomb used for the Trinity nuclear test. Parsons and Warner had decided that the combat use of the ...