B-29

B-29
Name	B-29 Superfortress
Caption	Boeing B-29 Superfortress in flight
Role	heavy bomber
Manufacturer	Boeing
First flight	1942
Introduced	1944
Retired	1960s
Primary user	United States Army Air Forces
Produced	1943–1946
Number built	3,970

B-29 The Boeing B-29 Superfortress was a four-engine Boeing heavy bomber developed for the United States Army Air Forces during World War II. Designed for high-altitude, long-range missions with a pressurized cabin and remote-controlled defensive armament, it played a decisive role in the Pacific War and the Atomic bombings of Hiroshima and Nagasaki. Postwar, the type influenced strategic planning during the early Cold War and served with the United States Air Force into the 1950s.

Design and Development

Boeing began designing the B-29 in response to an United States Army Air Corps requirement that emphasized range comparable to the Boeing B-17 Flying Fortress and payload approaching the Convair B-36 Peacemaker, while incorporating advances from Boeing 307 Stratoliner and lessons from the Boeing XB-15. Engineering teams led by Ed Heinemann and Vance Breese worked alongside Boeing facility staff in Seattle, Washington and Wichita, Kansas to integrate a pressurized fuselage similar to the Boeing 307 and innovative remote-controlled turrets derived from experiments with the Boulton Paul Defiant and systems tested on Martin B-26 Marauder prototypes. Development encountered challenges including engine overheating with the Wright R-3350 Duplex-Cyclone, production bottlenecks linked to Army Air Forces Materiel Command priorities, and modifications ordered after operational trials at Albuquerque Air Depot and Wright Field. The prototype program involved trials at NAS Patuxent River and acceptance flights over Rosie the Riveter workforce centers, culminating in type approval by Henry H. Arnold and deployment plans coordinated with Chester Nimitz and theater commanders.

Operational History

Deployed in late 1944, B-29 units under Twentieth Air Force command conducted strategic bombing from bases on Saipan, Tinian, and Iwo Jima against targets in the Empire of Japan, coordinating with General Curtis LeMay to shift tactics from high-altitude precision attacks toward low-altitude incendiary raids exemplified by the Bombing of Tokyo (1945). Crews from units such as the 509th Composite Group executed specialized missions culminating in the Atomic bombing of Hiroshima and Atomic bombing of Nagasaki, using aircraft modified for nuclear delivery under orders from Joint Chiefs of Staff and the Manhattan Project leadership including Leslie Groves and J. Robert Oppenheimer. Postwar, B-29s participated in Berlin Airlift preparations, nuclear test support during Operation Crossroads, and early Korean War operations under Far East Air Forces, before being superseded by jet-powered types like the Boeing B-47 Stratojet and strategic platforms such as the Boeing B-52 Stratofortress.

Variants

Production and test programs produced numerous variants to meet requirements from Army Air Forces and later United States Air Force commands. Notable versions included the long-range reconnaissance RB-29 adapted for Strategic Air Command missions, the B-29B stripped of certain defensive systems for increased speed under LeMay directives, the specialized Silverplate modification for the 509th Composite Group enabling atomic weapon carriage, and tanker and electronic warfare conversions like the KB-29 and TB-29 used by Air Training Command and Air Materiel Command. Prototype experiments informed later designs such as the XB-29 and influenced development of the B-50 Superfortress, which incorporated Wright R-4360 engines and strengthened airframes for transoceanic service.

Armament and Equipment

The B-29 featured remotely operated gun turrets developed with contractors including General Electric and concepts tested against Flak exposure experienced over European Theater of Operations. Defensive armament included multiple .50 caliber machine guns in remotely aimed turrets controlled via analog fire-control computers derived from systems trialed at Muroc Army Air Field and integrated with periscope sights influenced by earlier Consolidated B-24 Liberator arrangements. Navigation and bombing equipment incorporated the AN/APQ radar family, the Norden bombsight variants adapted for high-altitude work, and communication suites compatible with HF and VHF networks used by Twentieth Air Force command. Crew accommodations featured one of the first pressurized cabins in a heavy bomber, modeled after systems in the Boeing 307 Stratoliner and tested extensively at Ames Research Center and Langley Field.

Production and Operators

Manufactured primarily by Boeing at plants in Wichita, Renton, and Seattle, with subcontractors including Bell Aircraft, Martin Company, and Vultee Aircraft, total production approached 4,000 airframes between 1943 and 1946. Major operators included the United States Army Air Forces and its postwar successor, the United States Air Force, with deployments to Pacific Ocean Areas bases, Alaska staging sites, and United Kingdom interest in postwar assessments. Surplus aircraft were transferred to units within Strategic Air Command, used by Air Defense Command in radar calibration roles, or cannibalized for spares supporting the B-50 program. Some airframes were sold for civilian conversion and to film companies working with studios such as RKO Pictures.

Legacy and Cultural Impact

The B-29's role in ending World War II and influencing early Cold War doctrine made it a subject of public memory represented in museums like the Smithsonian National Air and Space Museum, the National Museum of the United States Air Force, and the Pacific Aviation Museum Pearl Harbor. It appears in films portraying the Pacific War and the Manhattan Project era, influenced literature by authors such as James Michener and appeared in journalism by reporters covering the Atomic Age. Technological advances from the B-29 program contributed to subsequent designs at Boeing and informed avionics development at Collins Aerospace precursors; surviving airframes restored by organizations including the Commemorative Air Force serve as flying memorials and educational exhibits.

Category:United States military aircraft