![]() Diagram of “Little Boy” gun-type uranium fission bomb. It weighed approximately 1,000 pounds (454 kilograms). The gun tube had a bore diameter of 165 millimeters (6.496 inches) and a length of 6 feet (1.8 meters). The bomb was 10 feet, 6 inches (3.2004 meters) long with a diameter of 2 feet, 4 inches (0.711 meters). ![]() It contained 64.15 kilograms (141.42 pounds) of highly-enriched uranium. This was an 8,900-pound (4,037 kilogram) “gun type” fission bomb, the Mark I, code-named Little Boy. The Martin-Omaha B-29-45-MO Superfortress, 44-86292, under the command of Colonel Paul Warfield Tibbets, Jr.,² was carrying Bomb Unit L-11, the first nuclear weapon to be used during war. Air Force)Ħ August 1945: At 0245 hours local time (1445 hours, 5 August, UTC), a four-engine, long range heavy bomber of the 509th Composite Group, United States Army Air Forces, took off from North Field on the island of Tinian in the Northern Mariana Islands, on the most secret combat mission of World War II.¹ Colonel Paul Warfield Tibbets, Jr., United States Army Air Corps, Commanding Officer, 509th Composite Group, and aircraft commander of the B-29 Superfortress, Enola Gay. Silverplate Martin-Omaha B-29-45-MO Superfortress 44-86292, “Dimples 82,” at Tinian, Mariana Islands, August 1945.
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