page_title: Bockscar
section_title: Airplane history
hierarchical_section_title: Bockscar / Airplane history
caption_attribution_description: English: Temporary triangle N tail marking of the B-29 bomber Bockscar, on August 9, 1945, the day of its atomic bombing mission
context_page_description: Bockscar, sometimes called Bock's Car, is the name of the United States Army Air Forces B-29 bomber that dropped a Fat Man nuclear weapon over the Japanese city of Nagasaki during World War II in the second – and last – nuclear attack in history. One of 15 Silverplate B-29s used by the 509th, Bockscar was built at the Glenn L. Martin Aircraft Plant at Bellevue, Nebraska, at what is now Offutt Air Force Base, and delivered to the United States Army Air Forces on 19 March 1945. It was assigned to the 393rd Bombardment Squadron, 509th Composite Group to Wendover Army Air Field, Utah in April.
  Bockscar was used in 13 training and practice missions from Tinian, and three combat missions in which it dropped pumpkin bombs on industrial targets in Japan. On 9 August 1945, Bockscar, piloted by the 393d Bombardment Squadron's commander, Major Charles W. Sweeney, dropped a Fat Man nuclear bomb with a blast yield equivalent to 21 kilotons of TNT over the city of Nagasaki. About 44% of the city was destroyed; 35,000 people were killed and 60,000 injured.
  After the war, Bockscar returned to the United States in November 1945.
context_section_description: Bockscar, B-29-36-MO 44-27297, Victor number 77, was one of 15 Silverplate B-29s used by the 393d Bombardment Squadron of the 509th Composite Group. Bockscar was built at the Glenn L. Martin Aircraft Plant at Bellevue, Nebraska, at what is now Offutt Air Force Base, as a Block 35 aircraft. It was one of 10 modified as a Silverplate and re-designated "Block 36". 
  Silverplate involved extensive modifications to the B-29 to carry nuclear weapons. The bomb bay doors and the fuselage section between the bomb bays were removed to create a single 33-foot (10 m) bomb bay. British suspensions and bracing were attached for both shape types, with the gun-type suspension anchored in the aft bomb bay and the implosion type mounted in the forward bay. Weight reduction was also accomplished by removal of gun turrets and armor plating. These B-29s also had an improved engine, the R-3350-41. The Silverplate aircraft represented a significant increase in performance over the standard variants.
  Delivered to the United States Army Air Forces on 19 March 1945, Bockscar was assigned to Captain Frederick C. Bock and crew C-13, and flown to Wendover Army Air Field, Utah in April. The name chosen for the aircraft, and painted on it after the mission, was a pun on the name of the aircraft commander. It left Wendover on 11 June 1945 for Tinian, where it arrived 16 June. It was originally given the Victor (unit-assigned identification) number 7 but on 1 August was given the triangle N tail markings of the 444th Bombardment Group as a security measure, and had its Victor changed to 77 to avoid misidentification with an actual 444th aircraft.
  Bockscar was used in 13 training and practice missions from Tinian, and three combat missions in which it dropped pumpkin bombs on industrial targets in Japan, in which Bock's crew bombed Niihama and Musashino, and First Lieutenant Charles Donald Albury and crew C-15 bombed Koromo.
caption: Bockscar with temporary triangle N tail marking, on 9 August 1945, the day of its atomic bombing mission
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