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Boeing B-29 Superfortress "Enola Gay"
Boeing's B-29 Superfortress was the most sophisticated, propeller-driven, bomber to fly during World War II, and the first bomber to house its crew in pressurized compartments. Boeing installed very advanced armament, propulsion, and avionics systems into the Superfortress. During the war in the Pacific Theater, the B-29 delivered the first nuclear weapons used in combat. On August 6, 1945, Colonel Paul W. Tibbets, Jr., in command of the Superfortress "Enola Gay," dropped an atomic bomb on Hiroshima, Japan. Three days later, Major Charles W. Sweeney piloted another B-29 named "Bockscar" and dropped a second atomic bomb on Nagasaki, Japan. On August 14, 1945, the Japanese accepted Allied terms for unconditional surrender.
As war clouds darkened Europe in the late 1930s, some U. S. Army Air Corps leaders recognized the need for very long-range bombers that exceeded the performance of the B-17 Flying Fortress (see NASM collection). Several years of preliminary studies paralleled a continuous fight against those who saw no good reasons to develop such an aircraft but the Air Corps issued a requirement for the new bomber in February 1940. It described an airplane that could carry a maximum bomb load of 909 kg (2,000 lb) at a speed of 644 kph (400 mph) a distance of at least 8,050 km (5,000 miles).
Boeing, Consolidated, Douglas, and Lockheed responded with design proposals. The Army was impressed with the Boeing design and issued a contract for two flyable prototypes in September 1940. In April 1941, the Army issued another contract for 250 aircraft plus spare parts equivalent to another 25 bombers, eight months before Pearl Harbor and nearly a year-and-a-half before the first Superfortress would fly.
Among the design's innovations was a long, narrow, high-aspect ratio wing equipped with large Fowler-type flaps. This wing design allowed the B-29 to fly very fast at high altitudes without also having unmanageable flight characteristics during the slower speeds required for landing and takeoff. More revolutionary was the size and sophistication of the pressurized sections of the fuselage: the flight deck forward of the wing, the gunner's compartment aft of the wing, and the tail gunner's station. For the crew, flying at extreme altitudes was almost comfortable.
To protect the Superfortress, Boeing designed the most sophisticated remote-controlled, defensive weapons system yet fitted to a military airplane. Engineers placed five gun turrets on the fuselage: a turret above and behind the cockpit that housed two .50 caliber machine guns (four guns in later versions), and another turret aft near the vertical tail equipped with two machine guns; plus two more turrets beneath the fuselage, each equipped with two .50 caliber guns. One of these turrets fired from behind the nose gear and the other hung further back near the tail. Another two .50 caliber machine guns and a 20-mm cannon (in early versions of the B-29) were fitted in the tail beneath the rudder. The really novel innovation was in the sighting system. Gunners operated these turrets by remote control. They aimed the guns using computerized sights, and each gunner could take control of two or more turrets to concentrate firepower on a single target, making the system flexible and effective.
Boeing also equipped the B-29 with advanced radar equipment and avionics. Depending on the type of mission, a B-29 carried the AN/APQ-13 or AN/APQ-7 Eagle radar system to aid bombing and navigation. These systems were accurate enough to permit blind bombing through cloud layers that completely obscured the target. The B-29B was equipped with the AN/APG-15B airborne radar gun sighting system mounted in the tail, insuring accurate defense against enemy fighters attacking at night. The B-29s also routinely carried as many as twenty different types of radios and navigation devices.
The first XB-29 took off at Boeing Field in Seattle on September 21, 1942. By the end of the year the second aircraft was ready for flight. Fourteen service-test YB-29s followed as production began to accelerate. Building this advanced bomber required massive logistics. Boeing built new B-29 plants at Renton, Washington, and Wichita, Kansas, while Bell built a new plant at Marietta, Georgia, and Martin built one in Omaha, Nebraska. Both Curtiss-Wright and the Dodge automobile company vastly expanded their manufacturing capacity to build the bomber's powerful and complex Curtiss-Wright R-3350 turbo supercharged engines. The program required thousands of sub-contractors but with extraordinary effort, it all came together, despite major teething problems. By April 1944, the first operational B-29s of the newly formed 20th Air Force began to touch down on dusty airfields in India.
By May 8, 130 B-29s were operational. On June 5, 1944, less than two years after the initial flight of the XB-29, the U. S. Army Air Forces (AAF) flew its first B-29 combat mission against targets in Bangkok, Thailand. This mission (longest of the war to date) called for 100 B-29s but only 80 reached the target area. The AAF lost no aircraft to enemy action but bombing results were mediocre. The first bombing mission against the Japanese main islands, since Doolittle's Raid in April 1942, occurred on June 15, again with poor results. This was also the first mission launched from airbases in China.
With the fall of Saipan, Tinian, and Guam in the Mariana Islands chain in August 1944, the AAF acquired airbases that lay several hundred miles closer to Japan's home islands. Late in 1944, the AAF moved the XXI Bomber Command, flying B-29s, to the Marianas and the unit began bombing Japan in December. However, they employed high-altitude, precision, bombing tactics that yielded poor results. In March 1945, Major General Curtis E. LeMay ordered the group to abandon these tactics and strike instead at night, from low altitude, using incendiary bombs. These attacks, carried out by hundreds of B-29s, soon devastated much of Japan's industrial and economic infrastructure and contributed in no small way to the Japanese surrender.
Late in 1944, AAF leaders selected the Martin assembly line to produce a batch of Superfortress atomic bombers codenamed "Silverplate" aircraft. Martin modified these special B-29s by deleting all gun turrets except for the tail position, removing armor plate, installing Curtiss electric propellers, and configuring the bomb bay to accommodate either the "Fat Man" or "Little Boy" versions of the atomic bomb. The AAF assigned 15 Silverplate ships to the 509th Composite Group commanded by Colonel Paul Tibbets and he named his personal B-29 "Enola Gay" after his mother.
"Enola Gay" is a model B-29-45-MO, serial number 44-86292. The AAF accepted this aircraft on June 15, 1945, from the Martin plant at Omaha, Nebraska. After the war, air force crews flew the airplane during the Operation Crossroads atomic test program in the Pacific and then delivered it to Davis-Monthan Army Airfield, Arizona, for storage. Later, the U. S. Air Force flew the famous bomber to Park Ridge, Illinois, then transferred it to the Smithsonian Institution on July 4, 1949. Although in Smithsonian custody, the aircraft remained stored at Pyote Air Force Base, Texas, between January 1952 and December 1953. The airplane's last flight ended on December 2 when the "Enola Gay" touched down at Andrews Air Force Base, Maryland. The bomber remained at Andrews in outdoor storage until July 1961. By then quite concerned about the bomber deteriorating outdoors, the Smithsonian sent collections staff to disassemble the Superfortress and move it indoors, out of the elements, to the Paul E. Garber Facility in Suitland, Maryland.
The staff at Garber began working to preserve and restore "Enola Gay" in December 1984. This was the largest restoration project ever undertaken at the National Air and Space Museum and the restoration specialists anticipated the work would require from seven to nine years to complete. The project actually lasted more than ten years. The restored forward fuselage and other parts of the airplane were exhibited publicly downtown on the Washington, D. C., Mall in May 1995. The "Enola Gay," fully restored and completely assembled, is on display at the Steven F. Udvar-Hazy Center. |