Boeing B-17 Flying Fortress
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| Boeing B-17 Flying Fortress | |
|---|---|
 Airwolfhound · CC BY-SA 2.0 · source | |
| Name | Boeing B-17 Flying Fortress |
| Caption | Boeing B-17 in flight during World War II |
| Role | Heavy bomber |
| Manufacturer | Boeing |
| First flight | 1935 |
| Introduction | 1938 |
| Primary user | United States Army Air Forces |
| Produced | 1936–1945 |
| Number built | 12,731 |
Boeing B-17 Flying Fortress The Boeing B-17 Flying Fortress is a four-engine heavy bomber developed by Boeing in the 1930s for the United States Army Air Corps and later used extensively by the United States Army Air Forces during World War II. Renowned for its durability, defensive armament, and service in strategic bombing campaigns, the B-17 served in major theaters including the European Theater of Operations, the Pacific Theater of Operations, and the China-Burma-India Theater. Pilots, crewmen, and commanders such as James H. Doolittle, Curtis LeMay, and Jimmy Doolittle feature in its operational lore, while engagements like the Bombing of Berlin, Schweinfurt–Regensburg mission, and the Battle of the Atlantic defined its wartime role.
Development and Design
Design work began at Boeing under chief engineer Edgar Schmued and project leaders influenced by earlier prototypes like the Boeing Model 299. Early trials involved testing at Wright Field and collaboration with firms including Douglas Aircraft Company and Lockheed Corporation for systems and subsystems. Structural innovations included a semi-monocoque fuselage, multi-spar wings influenced by research at Langley Research Center, and a glazed nose inspired by designs from Handley Page and Vickers. Powerplants evolved from Wright R-1820 Cyclone radials to later variants incorporating refinements trialed by Pratt & Whitney and General Electric for superchargers and turbochargers. Defensive armament configurations were informed by combat assessments from the Royal Air Force and tactics developed by air commanders at RAF Bomber Command and Eighth Air Force. Avionics and navigation suites integrated equipment from Bendix Corporation, Collins Radio Company, and guidance principles similar to those used in Norden bombsight development at Carl L. Norden's teams.
Operational History
The B-17 entered service with the United States Army Air Corps in the late 1930s and saw its first combat with units from the Eighth Air Force operating out of England against targets in Germany, including industrial centers like Krupp Works, Düsseldorf, and Hamburg. Strategic doctrine shaped by planners at Air War Plans Division and leaders such as Hap Arnold emphasized daylight precision bombing against the German war industry. Missions highlighted include the Schweinfurt–Regensburg mission and sustained raids during the Bombing of Dresden and Operation Pointblank. In the Pacific, B-17s supported campaigns such as the Guadalcanal Campaign and the defense of Midway Atoll; crews encountered adversaries including units of the Imperial Japanese Navy Air Service and Imperial Japanese Army Air Service. The aircraft’s resilience was exemplified in accounts involving crews like the Memphis Belle and stories documented by wartime correspondents embedded with units from Eighth Air Force, Fifth Air Force, and Twelfth Air Force.
Variants and Modifications
The B-17 family spawned numerous variants including early blocks like the B-17B and B-17C, combat-optimized models such as the B-17E and B-17F, and the definitive B-17G with a chin turret developed after analysis by engineers at Northrop Corporation and operational feedback from RAF Coastal Command. Specialized conversions included the F-9 photographic reconnaissance adaptation used by the Army Air Forces Photographic Unit, the PB-1 under United States Navy designation, and civilianized transports operated by carriers like Pan American World Airways and Trans World Airlines. Field modifications by units from Eighth Air Force and maintenance depots in East Anglia led to ad hoc solutions for self-sealing fuel tanks, radar installations pioneered by teams at MIT Radiation Laboratory, and defensive armament trials influenced by ordnance officers from US Army Air Forces Materiel Command.
Production and Operators
Primary production was carried out by Boeing at plants in Seattle, supplemented by license-built examples from Douglas Aircraft Company, Lockheed Vega, and North American Aviation subcontractors. Major operators included the United States Army Air Forces, the Royal Air Force, Royal Australian Air Force, Free French Air Forces, and postwar users such as the United States Air Force and various civilian operators. Lend-Lease shipments involved coordination with the Soviet Union via Soviet Air Forces allocations and transfers to allied air arms in China under the Republic of China Air Force and to units engaged in North African Campaign operations. After WWII, surplus B-17s served with aerial mapping agencies like US Geological Survey contractors and in roles for broadcasters and film studios including partnerships with 20th Century Fox and Warner Bros..
Performance and Specifications
Typical mission profiles relied on engines like the Wright R-1820 producing up to 1,200 hp each, giving cruise speeds around 150–170 mph and maximum speeds approaching 287 mph depending on block and loadout. Operational ceilings varied with payload and environmental conditions, commonly between 25,000 and 35,000 feet for strategic missions over Europe. Defensive armament on late models included multiple .50 caliber machine guns configured in turrets and waist positions, while bombloads ranged from tactical 2,000 lb to strategic loads up to 8,000 lb for short-range missions. Navigational accuracy employed instruments and technologies from A-3 Navigation School doctrines, celestial navigation taught at United States Naval Academy-linked programs, and bombing aiming using the Norden bombsight and training at facilities like Mather Field.
Legacy and Cultural Impact
The B-17 became an icon in wartime propaganda and postwar memory, celebrated in media such as the documentary film "Memphis Belle: A Story of a Flying Fortress" and fictionalized accounts in novels by authors associated with Macmillan Publishers and Random House. Museums preserving airworthy examples include National Museum of the United States Air Force, Smithsonian National Air and Space Museum, and the B-17 Preservation Association collections displayed at airshows like EAA AirVenture Oshkosh. Commemorations involve veterans’ organizations such as the Commemorative Air Force, reunions hosted by the American Air Museum and academic studies at institutions like Harvard University and Oxford University exploring strategic bombing doctrine. The aircraft influenced aircraft design bureaus worldwide, informed Cold War developments at Boeing and Lockheed Martin, and remains a subject of historical research at archives including the National Archives and Records Administration and the Imperial War Museum.