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| Consolidated B-17 Flying Fortress | |
|---|---|
| Name | Consolidated B-17 Flying Fortress |
| Caption | B-17G in flight |
| Role | Heavy bomber |
| Manufacturer | Consolidated Aircraft |
| First flight | 1935 (as Y1B-17 prototype) |
| Introduced | 1938 |
| Retired | 1960s (military), still flown by collectors |
| Primary user | United States Army Air Forces |
| Produced | 12,731 |
| Number built | 12,731 |
Consolidated B-17 Flying Fortress The Consolidated B-17 Flying Fortress was a four-engine heavy bomber developed in the 1930s for the United States Army Air Corps and used extensively by the United States Army Air Forces during World War II. Renowned for its durability, defensive armament and strategic role, the aircraft saw action over the European Theater of Operations, the Mediterranean Theater of Operations, and the Pacific Theater of Operations. It engaged in major campaigns such as the Strategic bombing of Germany, the Battle of the Atlantic, and the Oil Campaign of World War II. The type became emblematic in works like Twelve O'Clock High and earned crews distinctions including the Medal of Honor and the Distinguished Flying Cross.
Consolidated Aircraft designed the B-17 after responding to a 1934 United States Army Air Corps specification; early prototypes such as the Y1B-17 incorporated lessons from contemporaries like the Handley Page Heyford and the Boeing B-17 prototype competition. The airframe combined a stressed-skin fuselage, multi-spar wing structure influenced by Douglas Aircraft Company practices, and four Wright R-1820 Cyclone radial engines, mirroring powerplants used in types like the Boeing 247. Defensive design emphasized multiple powered turrets and waist guns inspired by reports from the Spanish Civil War; later additions included the B-17G chin turret to counter frontal attacks encountered in engagements such as the Schweinfurt–Regensburg mission. Avionics and navigation systems evolved with adoption of Automatic Direction Finder equipment, the Northrop B-2-influenced autopilot concepts, and later integration of radar countermeasures akin to those used in Operation Crossbow.
Operational deployment began with units like the 1st Bombardment Wing and the 8th Air Force in England for daylight precision raids against the Nazi Germany industrial base. Early missions over locations such as Krupp Steel Works and the Messerschmitt factory at Regensburg revealed vulnerabilities that led to tactical changes following losses in operations like the Schweinfurt raids. In the Mediterranean, the B-17 served with the 12th Air Force and the 15th Air Force from bases in North Africa and Italy, contributing to campaigns including attacks on targets in Ploiești. In the Pacific, units such as the 19th Bombardment Group flew long-range sorties from bases in Guam and the Philippines against Japanese Empire targets. Postwar, many airframes transferred to organizations such as the Civil Aeronautics Administration and civilian operators, while others entered service with allied air forces including the Royal Air Force and the Free French Air Force.
The B-17 family included production models developed into operational variants: initial service models like the B-17B and B-17C; combat-modified B-17E with a tail turret influenced by Eighth Air Force combat reports; the B-17F with structural improvements; and the definitive B-17G incorporating a Norden bombsight-era nose and a chin turret. Specialized conversions produced pathfinder and reconnaissance versions used by units such as the 487th Bombardment Group, electronic countermeasure modifications employed in Operation Pointblank derivatives, and transport or drone conversions used by the US Navy and research organizations such as the National Advisory Committee for Aeronautics. Lend-lease and allied conversions adapted airframes for roles with the Royal Canadian Air Force, Royal Australian Air Force, and Soviet Air Force testing programs.
Mass production centered at Consolidated plants in Fort Worth, Texas and facilities operated by subcontractors including Douglas Aircraft Company and Boeing components suppliers. Industrial mobilization engaged wartime contractors such as Kawasaki Heavy Industries for licensed work in occupied territories postwar evaluations. Primary operators included the United States Army Air Forces, with combat groups in the 8th Air Force, 9th Air Force, 12th Air Force, 15th Air Force, and 10th Air Force; allied operators comprised the Royal Air Force, Royal Canadian Air Force, Royal Australian Air Force, Free French Air Force, and limited postwar service with the Colonial French Air Force. Production figures reached approximately 12,731 airframes, assembled under wartime programs like the Arsenal of Democracy industrial effort.
Typical specifications for late-production models (B-17G) included a wingspan of about 103 ft 9 in, length near 74 ft 9 in, and maximum takeoff weight approaching 65,500 lb; propulsion comprised four Wright R-1820 Cyclone engines producing roughly 1,200 hp each. Defensive armament in the G-model featured up to 13 .50 caliber (12.7 mm) Browning M2 machine guns in configurations including dorsal, ventral, tail, and nose positions. Bomb load capacity varied with mission radius, with internal payloads commonly 4,000–8,000 lb for long-range strikes and external configurations for shorter-range heavy loads. The aircraft integrated the Norden bombsight for precision level bombing, radio navigation gear like the Radio Range and later LORAN-inspired systems, and structural redundancies that improved combat survivability.
Combat experience shaped tactics such as tight combat box formations flown by units like the 91st Bomb Group and 100th Bomb Group to maximize overlapping fields of fire against Luftwaffe fighter attacks. Daylight precision bombing doctrine, advocated by proponents including General Henry H. Arnold and planners from the Air Corps Tactical School, relied on high-altitude formations aiming at industrial targets in cities like Hamburg and Berlin. Losses during deep penetration raids over Germany prompted fighter escort strategies culminating in long-range escort operations by the Republic P-47 Thunderbolt and the North American P-51 Mustang, reducing attrition seen in missions such as the Black Thursday operations. Damage tolerance frequently allowed damaged B-17s to return to base, exemplified in widely documented cases preserved in accounts of crews awarded the Medal of Honor and other citations.
Numerous surviving airframes are preserved in museums like the National Museum of the United States Air Force, the Imperial War Museum Duxford, and the Smithsonian National Air and Space Museum affiliate collections. Airworthy examples maintained by organizations such as the Commemorative Air Force and the Experimental Aircraft Association participate in airshows and memorial flights; notable flying examples include those operated by groups in Tucson, Arizona and Dane County, while static exhibits reside at locations like the Pima Air & Space Museum and the Museum of Flight. Restoration projects often involve international collaborations between institutions like the Canadian Warplane Heritage Museum and private collectors, ensuring the B-17's legacy in displays, documentaries, and heritage flights.
Category:World War II aircraft Category:Heavy bombers