Boeing B-17 Flying Fortress

"B-17" redirects here. For other uses, see B17 (disambiguation).

"Flying Fortress" redirects here. For the 1942 film, see Flying Fortress (film).

B-17 Flying Fortress
Boeing B-17E
Role	Heavy bomber
National origin	United States
Manufacturer	Boeing
First flight	28 July 1935
Introduction	April 1938
Retired	1968 (Brazilian Air Force)
Primary users	United States Army Air Forces Royal Air Force
Produced	1936–1945
Number built	12,731
Unit cost	US$238,329(1945)
Variants	XB-38 Flying Fortress YB-40 Flying Fortress C-108 Flying Fortress
Developed into	Boeing 307 Stratoliner

Boeing B-17F Flying Fortress above Mount Rainier, 1943. Photo by Robert Yarnall Richie.

The Boeing B-17 Flying Fortress is a four-engine heavy bomber aircraft developed in the 1930s for the United States Army Air Corps (USAAC). Competing against Douglas and Martin for a contract to build 200 bombers, the Boeing entry outperformed both competitors and exceeded the air corps' expectations. Although Boeing lost the contract because the prototype crashed, the air corps was so impressed with Boeing's design that it ordered 13 more B-17s for further evaluation. From its introduction in 1938, the B-17 Flying Fortress evolved through numerous design advances.

The B-17 was primarily employed by the United States Army Air Forces (USAAF) in the daylight precision strategic bombing campaign of World War II against German industrial and military targets. The United States Eighth Air Force, based at many airfields in southern England, and the Fifteenth Air Force, based in Italy, complemented the RAF Bomber Command's nighttime area bombing in the Combined Bomber Offensive to help secure air superiority over the cities, factories and battlefields of Western Europe in preparation for the invasion of France in 1944. The B-17 also participated to a lesser extent in the War in the Pacific, early in World War II, where it conducted raids against Japanese shipping and airfields.

From its pre-war inception, the USAAC (later, the USAAF) touted the aircraft as a strategic weapon; it was a potent, high-flying, long-range bomber that was able to defend itself, and to return home despite extensive battle damage. Its reputation quickly took on mythic proportions, and widely circulated stories and photos of notable numbers and examples of B-17s surviving battle damage increased its iconic status. With a service ceiling greater than any of its Allied contemporaries, the B-17 established itself as an effective weapons system, dropping more bombs than any other U.S. aircraft in World War II. Of the 1.5 million tonnes of bombs dropped on Germany and its occupied territories by U.S. aircraft, 640,000 tonnes were dropped from B-17s.

As of May 2015, 10 aircraft remain airworthy. None of them are combat veterans. Additionally, a few dozen more are in storage or on static display. The oldest is a D-series combat veteran with service in the Pacific and the Caribbean.

Development

Origins

Model 299 NX13372

Nose turret with gun fitted atop the Model 299's nose glazing

Crashed Model 299

Boeing Y1B-17 in flight

On 8 August 1934, the U.S. Army Air Corps (USAAC) tendered a proposal for a multi-engine bomber to replace the Martin B-10. The air corps was looking for a bomber capable of reinforcing the air forces in Hawaii, Panama, and Alaska. Requirements were that it would carry a "useful bombload" at an altitude of 10,000 feet (3 km) for 10 hours with a top speed of at least 200 miles per hour (320 km/h).

They also desired, but did not require, a range of 2,000 miles (3,200 km) and a speed of 250 miles per hour (400 km/h). The competition for the air corps contract would be decided by a "fly-off" between Boeing's design, the Douglas DB-1, and the Martin Model 146 at Wright Field in Dayton, Ohio.

The prototype B-17, with the Boeing factory designation of Model 299, was designed by a team of engineers led by E. Gifford Emery and Edward Curtis Wells, and was built at Boeing's own expense. It combined features of the experimental Boeing XB-15 bomber with the Boeing 247 transport aircraft. The B-17's armament consisted of up to 4,800 pounds (2,200 kg) of bombs on two racks in the bomb bay behind the cockpit, and initially possessed five 0.30 inches (7.62 mm) machine guns. It was powered by four Pratt & Whitney R-1690 "Hornet" radial engines each producing 750 horsepower (600 kW) at 7,000 feet (2,100 m).

The first flight of the Model 299 was on 28 July 1935 with Boeing chief test-pilot Leslie Tower at the controls. Richard Williams, a reporter for the Seattle Times, coined the name "Flying Fortress" when the Model 299 was rolled out bristling with multiple machine gun installations. The most unusual gun emplacement was the nose installation (see note for description and drawing), which allowed the single machine gun to be fired toward almost any frontal angle that an approaching enemy fighter could take to attack the B-17.

Boeing was quick to see the value of the name and had it trademarked for use. Boeing also claimed in some of the early press releases that Model 299 was the first combat aircraft that could continue its mission if one of its four engines failed. On 20 August 1935, the prototype flew from Seattle to Wright Field in nine hours and three minutes at an average cruising speed of 252 miles per hour (406 km/h), much faster than the competition.

At the fly-off, the four-engine Boeing's performance was superior to those of the twin-engine DB-1 and Model 146. Then-Major General Frank Maxwell Andrews of the GHQ Air Force believed that the long-range capabilities of four-engine large aircraft were more effective than shorter-ranged, twin-engine aircraft, and that the B-17 was better suited to their doctrine. His opinions were shared by the air corps procurement officers, and even before the competition had finished they suggested buying 65 B-17s.

Development continued on the Boeing Model 299, and on 30 October 1935, army air corps test-pilot Major Ployer Peter Hill and Boeing employee Les Tower took the Model 299 on a second evaluation flight. The crew forgot to disengage the "gust locks", a system of devices integral to the design that held the bomber's movable control surfaces in place while the aircraft was parked on the ground. After take-off, due to the failure to manually disengage all of the gust locks, the aircraft entered a steep climb, stalled, nosed over, and crashed, killing Hill and Tower (other observers survived with injuries).

The crashed Model 299 could not finish the evaluation and, while the air corps was still enthusiastic about the aircraft's potential, army officials were daunted by the much greater expense per aircraft (Douglas quoted a unit price of $58,200 based on a production order of 220 aircraft, compared with a price of $99,620 from Boeing), and as the competition could not be completed Boeing was legally disqualified from the consideration for the contract. Army Chief of Staff Malin Craig cancelled the order for 65 YB-17s, and ordered 133 of the twin-engine Douglas B-18 Bolo instead.

The loss was not total... but Boeing's hopes for a substantial bomber contract were dashed.

— Peter Bowers, 1976

Initial orders

B-17Bs at March Field, California, prior to attack on Pearl Harbor, with framed nose glazing of the style retained through the B-17E model.

Nose of a B-17 being restored at the Mighty Eighth Air Force Museum

Regardless, the USAAC had been impressed by the prototype's performance, and on 17 January 1936, through a legal loophole, the air corps ordered 13 YB-17s (designated Y1B-17 after November 1936 to denote its special F-1 funding) for service testing. The YB-17 incorporated a number of significant changes from the Model 299, including more powerful Wright R-1820-39 Cyclone engines replacing the original Pratt & Whitneys. Although the prototype was company-owned and never received a military serial (the B-17 designation itself did not appear officially until January 1936, nearly three months after the prototype crashed), the term "XB-17" was retroactively applied to the airframe and has entered the lexicon to describe the first Flying Fortress.

Between 1 March and 4 August 1937, 12 of the 13 Y1B-17s were delivered to the 2nd Bombardment Group at Langley Field in Virginia for operational development and flight tests. One suggestion adopted was the use of a pre-flight checklist to avoid accidents such as that which befell the Model 299. In one of their first missions, three B-17s, directed by lead navigator Lieutenant Curtis LeMay, were sent by General Andrews to "intercept" and photograph the Italian ocean liner Rex 610 miles (980 km) off the Atlantic coast. The mission was successful and widely publicized. The 13th Y1B-17 was delivered to the Material Division at Wright Field, Ohio, to be used for flight testing.

A 14th Y1B-17 (37-369), originally constructed for ground testing of the airframe's strength, was upgraded and fitted with exhaust-driven turbochargers. Scheduled to fly in 1937, it encountered problems with the turbochargers, and its first flight was delayed until 29 April 1938. The aircraft was delivered to the army on 31 January 1939. Once service testing was complete, the Y1B-17s and Y1B-17A were redesignated B-17 and B-17A respectively to signify the change to operational status.

Opposition to the air corps' ambitions for the acquisition of more B-17s faded, and in late 1937, 10 more aircraft designated B-17B were ordered to equip two bombardment groups, one on each U.S. coast. Improved with larger flaps, rudder and a well-framed plexiglas nose, the B-17Bs were delivered in five small batches between July 1939 and March 1940. In July 1940, an order for 512 B-17s was issued; however, prior to the attack on Pearl Harbor, fewer than 200 B-17s were in service with the army.

A total of 155 B-17s of all variants were delivered between 11 January 1937 and 30 November 1941, but production quickly accelerated, with the B-17 eventually achieving the highest production rate for any large aircraft. The aircraft went on to serve in every World War II combat zone, and by the time production ended in May 1945, 12,731 aircraft had been built by Boeing, Douglas and Vega (a subsidiary of Lockheed).

Though the crash of the prototype 299 in 1935 had almost wiped out Boeing, now it was seen as a boon. Instead of building models based on experimental engineering, Boeing had been hard at work developing their bomber and now had versions ready for production far better than would have been possible otherwise. One of the most significant weapons of World War II would be ready, but only by a hair.

— Jeff Ethell, 1985

Design and variants

Main article: Boeing B-17 Flying Fortress variants

Production numbers

Variant	Produced	First flight
Model 299	1	28 July 1935
YB-17	13	2 December 1936
YB-17A	1	29 April 1938.
B-17B	39	27 June 1939
B-17C	38	21 July 1940
B-17D	42	3 February 1941
B-17E	512	5 September 1941
B-17F (total)	3,405	30 May 1942
B-17F-BO	2,300
B-17F-DL	605
B-17F-VE	500
B-17G (total)	8,680	August 16, 1943
B-17G-BO	4,035
B-17G-DL	2,395
B-17G-VE	2,250
Total	12,731
Notes: B-17s were built at Boeing Plant 2 Seattle, Washington (BO) and starting with the B-17F also at Lockheed Vega, Burbank California (VE) and Douglas Aircraft, Long Beach California (DL)

The aircraft went through several alterations in each of its design stages and variants. Of the 13 YB-17s ordered for service testing, 12 were used by the 2nd Bomb Group of Langley Field, Virginia, to develop heavy bombing techniques, and the 13th was used for flight testing at the Material Division at Wright Field, Ohio. Experiments on this aircraft led to the use of a quartet of turbo-superchargers which would become standard on the B-17 line. A 14th aircraft, the YB-17A, originally destined for ground testing only and upgraded with the turbochargers, was re-designated B-17A after testing had finished.

Waist position gun blister of Model 299, not adopted for production

As the production line developed, Boeing engineers continued to improve upon the basic design. To enhance performance at slower speeds, the B-17B was altered to include larger rudders and flaps. The B-17C changed from three bulged, oval shaped machine gun blisters to two flush, oval-shaped machine gun window openings and a single "bathtub" machine gun housing on the lower fuselage, that resembled the similarly configured and located ventral defensive emplacement on the German Heinkel He 111P-series medium bomber. Models A through D of the B-17 were designed defensively, while the large-tailed B-17E was the first model primarily focused on offensive warfare.

The B-17E was an extensive revision of the Model 299 design: The fuselage was extended by 10 ft (3.0 m); a much larger rear fuselage, vertical tail fin, rudder, and horizontal stabilizer were added to the design; a gunner's position was added in the new tail; the nose (especially the bombardier's well-framed nose glazing) remained relatively the same as the earlier B through D versions had, but with the addition of a Sperry electrically powered manned dorsal gun turret just behind the cockpit, and the similarly powered (also built by Sperry) manned ventral ball turret just aft of the bomb bay – replacing a relatively hard-to-use, Bendix-designed remotely operated ventral turret on the earliest examples of the E variant, that had also been used on the earlier marks of the North American B-25 Mitchell – resulted in a 20% increase in aircraft weight. The B-17's turbocharged Wright R-1820 Cyclone 9 engines were upgraded to increasingly more powerful versions of the same powerplants multiple times throughout its production, and similarly, the number of machine gun emplacement locations were increased to enhance their aircraft's combat effectiveness.

The B-17F variants were the primary versions flying for the Eighth Air Force to face the Germans in 1943, and had standardized the manned Sperry ball turret for ventral defense, along with an enlarged, nearly frameless plexiglas bombardier's nose enclosure for improved forward vision.

A B-17F of the 99th Bomb Group, with the nearly frameless clear-view bombardier's nose

Two experimental versions of the B-17 were flown under different designations, the XB-38 Flying Fortress and the YB-40 Flying Fortress. The XB-38 was an engine testbed for Allison V-1710 liquid-cooled engines, should the Wright engines normally used on the B-17 become unavailable. The only prototype XB-38 to fly crashed on its ninth flight and the type was abandoned, the V-1710 being kept for fighters.

The YB-40 was a heavily armed modification of the standard B-17 used before the North American P-51 Mustang, an effective long-range fighter, became available to act as escort. Additional armament included an additional dorsal turret in the radio room, a remotely operated and fired Bendix-built "chin turret" and twin guns in each of the waist positions. The ammunition load was over 11,000 rounds. All of these modifications made the YB-40 well over 10,000 lb (4,500 kg) heavier than a fully loaded B-17F. The YB-40s with their numerous heavy modifications had trouble keeping up with the lighter bombers once they had dropped their bombs, and so the project was abandoned and finally phased out in July 1943, but not before the final production blocks of the B-17F from Douglas' plants adopted the YB-40's remotely operated and fired Bendix "chin turret" for a much-improved forward defensive weapons installation.

B-17G nose detail

By the time the definitive B-17G appeared, the number of guns had been increased from seven to thirteen, the designs of the gun stations were finalized, and other adjustments were completed. The B-17G was the final version of the Flying Fortress, incorporating all changes made to its predecessor, the B-17F, adopting the remotely operated "chin turret" for forward defense from the YB-40 "gunship" version, and in total 8,680 were built, the last one (by Lockheed) on 28 July 1945. Many B-17Gs were converted for other missions such as cargo hauling, engine testing and reconnaissance. Initially designated SB-17G, a number of B-17Gs were also converted for search-and-rescue duties, later to be redesignated B-17H.

Postwar SB-17G-95DL
AF ser. No. 44-83722 assigned to the 2nd ERS as a search and rescue aircraft

Late in World War II, at least 25 B-17s were fitted with radio controls and television cameras, loaded with 20,000 lb (9,100 kg) of high-explosives and dubbed BQ-7 "Aphrodite missiles" for Operation Aphrodite. The operation, which involved remotely flying Aphrodite drones onto their targets by accompanying CQ-17 "mothership" control aircraft, was approved on 26 June 1944, and assigned to the 388th Bombardment Group stationed at RAF Fersfield, a satellite of RAF Knettishall.

The first four drones were sent to Mimoyecques, the Siracourt V-1 bunker, Watten and Wizernes on 4 August, causing little damage. The project came to a sudden end with the unexplained mid-air explosion over the Blyth estuary of a B-24, part of the United States Navy's contribution as "Project Anvil", en route for Heligoland piloted by Lieutenant Joseph P. Kennedy Jr., future U.S. president John F. Kennedy's elder brother. Blast damage was caused over a radius of 5 miles (8.0 km). British authorities were anxious that no similar accidents should again occur, and the Aphrodite project was scrapped in early 1945.

Operational history

B-17 Flying Fortresses from the 398th Bombardment Group fly a bombing run to Neumünster, Germany, on 13 April 1945. On 8 May, Germany surrendered, and Victory in Europe Day was declared.

The B-17 began operations in World War II with the Royal Air Force (RAF) in 1941 (but was not successful), and in the Southwest Pacific with the U.S. Army. The 19th Bombardment Group had deployed to Clark Field in the Philippines a few weeks before the Japanese attack on Pearl Harbor as the first of a planned heavy bomber buildup in the Pacific. Half of the group's B-17s were wiped out on 8 December 1941 when they were caught on the ground during refueling and rearming for a planned attack on Japanese airfields on Formosa. The small force of B-17s operated against the Japanese invasion force until they were withdrawn to Darwin, in Australia's Northern Territory. In early 1942, the 7th Bombardment Group began arriving in Java with a mixed force of B-17s and LB-30/B-24s. A squadron of B-17 from this force detached to the Middle East to join the First Provisional Bombardment Group thus becoming the first American B-17 squadron to go to war against the Germans. After the defeat in Java, the 19th withdrew to Australia where it continued in combat until it was sent back home by General George C. Kenney when he arrived in Australia in mid-1942. In July 1942, the first USAAF B-17s were sent to England to join the Eighth Air Force. Later that year two groups moved to Algeria to join Twelfth Air Force for operations in North Africa. The B-17s were primarily involved in the daylight precision strategic bombing campaign against German targets ranging from U-boat pens, docks, warehouses and airfields to industrial targets such as aircraft factories. In the campaign against German aircraft forces in preparation for the invasion of France, B-17 and B-24 raids were directed against German aircraft production while their presence drew the Luftwaffe fighters into battle with Allied fighters.

Early models proved to be unsuitable for combat use over Europe and it was the B-17E that was first successfully used by the USAAF. The defense expected from bombers operating in close formation alone did not prove effective and the bombers needed fighter escorts to operate successfully.

During World War II, the B-17 equipped 32 overseas combat groups, inventory peaking in August 1944 at 4,574 USAAF aircraft worldwide. B-17s dropped 640,036 short tons (580,631 metric tons) of bombs on European targets (compared to 452,508 short tons (410,508 metric tons) dropped by the Liberator and 463,544 short tons (420,520 metric tons) dropped by all other U.S. aircraft). The British heavy bombers, the Avro Lancaster and Handley Page Halifax, dropped 608,612 long tons (681,645 short tons) and 224,207 long tons (251,112 short tons) respectively.

RAF use

RAF Fortress B.I serial AN529, with He 111H-style "bathtub" ventral gondola.

The Royal Air Force entered World War II with no heavy bomber of its own in service; the biggest available were long-range medium bombers such as the Vickers Wellington which could carry up to 4,500 pounds (2,000 kg) of bombs. While the Short Stirling and Handley Page Halifax would become its primary bombers by 1941, in early 1940 the RAF entered into an agreement with the U.S. Army Air Corps to be provided with 20 B-17Cs, which were given the service name Fortress I. Their first operation, against Wilhelmshaven on 8 July 1941 was unsuccessful; on 24 July, the target was the Scharnhorst, anchored in Brest. Considerable damage was inflicted on the vessel.

By September, after the RAF had lost eight B-17Cs in combat or to accidents and many instances of aborts due to mechanical problems, Bomber Command abandoned daylight bombing raids using the Fortress I because of the aircraft's poor performance. The experience showed both the RAF and USAAF that the B-17C was not ready for combat, and that improved defenses, larger bomb loads and more accurate bombing methods were required. However the USAAF continued using the B-17 as a day bomber, despite misgivings by the RAF that attempts at daylight bombing would be ineffective.

As usage by Bomber Command had been curtailed, the RAF transferred its remaining Fortress I aircraft to Coastal Command for use as a long-range maritime patrol aircraft instead. These were later augmented in August 1942 by 19 Fortress Mk II (B-17F) and 45 Fortress Mk IIA (B-17E). A Fortress from No. 206 Squadron RAF sank U-627 on 27 October 1942, the first of 11 U-boat kills credited to RAF Fortress bombers during the war.

The RAF's No. 223 Squadron, as part of 100 Group, operated a number of Fortresses equipped with an electronic warfare system known as "Airborne Cigar" (ABC). This was operated by German–speaking radio operators who would identify and jam German ground controllers' broadcasts to their nightfighters. They could also pose as ground controllers themselves with the intention of steering nightfighters away from the bomber streams.

Initial USAAF operations over Europe

Women pilots leaving their B-17, "Pistol Packin' Mama", at Lockbourne AAF, Ohio, during WASP training to ferry B-17 aircraft. Left to right are Frances Green, Marget Kirchner, Ann Waldner and Blanche Osborn.

"Combat boxes" of 12 B-17 during bombing missions.

Marks and letters on the tails of B-17 during WWII in Europe.

The air corps (renamed United States Army Air Forces (USAAF) on 20 June 1941), using the B-17 and other bombers, bombed from high altitudes using the then-secret Norden bombsight, known as the "Blue Ox", which was an optical electro-mechanical gyro-stabilized analog computer. The device was able to determine, from variables input by the bombardier, the point at which the aircraft's bombs should be released to hit the target. The bombardier essentially took over flight control of the aircraft during the bomb run, maintaining a level altitude during the final moments before release.

The USAAF began building up its air forces in Europe using B-17Es soon after entering the war. The first Eighth Air Force units arrived in High Wycombe, England, on 12 May 1942, to form the 97th Bomb Group. On 17 August 1942, 12 B-17Es of the 97th, with the lead aircraft piloted by Major Paul Tibbets and carrying Brigadier General Ira Eaker as an observer, were close escorted by four squadrons of RAF Spitfire IXs (and a further five squadrons of Spitfire Vs to cover the withdrawal) on the first USAAF heavy bomber raid over Europe, against the large railroad marshalling yards at Rouen-Sotteville in France, while a further six aircraft flew a diversionary raid along the French coast. The operation, carried out in good visibility, was a success, with only minor damage unrelated to the enemy to one aircraft and half the bombs landing in the target area. The raid helped assuage British doubts about the capabilities of American heavy bombers in operations over Europe.

Two additional groups arrived in England at the same time, bringing with them the first B-17Fs, which would serve as the primary AAF heavy bomber fighting the Germans until September 1943. As the raids of the American bombing campaign grew in numbers and frequency, German interception efforts grew in strength (such as during the attempted bombing of Kiel on 13 June 1943), such that unescorted bombing missions came to be discouraged.

Combined offensive

The two different strategies of the American and British bomber commands were organized at the Casablanca Conference in January 1943. The resulting "Combined Bomber Offensive" would weaken the Wehrmacht, destroy German morale and establish air superiority through Operation Pointblank's destruction of German fighter strength in preparation for a ground offensive. The USAAF bombers would attack by day, with British operations – chiefly against industrial cities – by night.

B-17F formation over Schweinfurt, Germany, 17 August 1943

Boeing B-17F radar bombing through clouds: Bremen, Germany, on 13 November 1943.

Operation Pointblank opened with attacks on targets in Western Europe. General Ira C. Eaker and the Eighth Air Force placed highest priority on attacks on the German aircraft industry, especially fighter assembly plants, engine factories and ball-bearing manufacturers. Attacks began in April 1943 on heavily fortified key industrial plants in Bremen and Recklinghausen.

Since the airfield bombings were not appreciably reducing German fighter strength, additional B-17 groups were formed, and Eaker ordered major missions deeper into Germany against important industrial targets. The 8th Air Force then targeted the ball-bearing factories in Schweinfurt, hoping to cripple the war effort there. The first raid on 17 August 1943 did not result in critical damage to the factories, with the 230 attacking B-17s being intercepted by an estimated 300 Luftwaffe fighters. The Germans shot down 36 aircraft with the loss of 200 men, and coupled with a raid earlier in the day against Regensburg, a total of 60 B-17s were lost that day.

A second attempt on Schweinfurt on 14 October 1943 would later come to be known as "Black Thursday". While the attack was successful at disrupting the entire works, severely curtailing work there for the remainder of the war, it was at an extreme cost. Of the 291 attacking Fortresses, 60 were shot down over Germany, five crashed on approach to Britain, and 12 more were scrapped due to damage – a total loss of 77 B-17s. A total of 122 bombers were damaged and needed repairs before their next flight. Out of 2,900 men in the crews, about 650 men did not return, although some survived as prisoners of war. Only 33 bombers landed without damage. These losses were a result of concentrated attacks by over 300 German fighters.

B-17G of the 384th Bomb Group on the bomb run

Such high losses of air crews could not be sustained, and the USAAF, recognizing the vulnerability of heavy bombers to interceptors when operating alone, suspended daylight bomber raids deep into Germany until the development of an escort fighter that could protect the bombers all the way from the United Kingdom to Germany and back. At the same time, the German night fighting ability noticeably improved to counter the nighttime strikes, challenging the conventional faith in the cover of darkness. The Eighth Air Force alone lost 176 bombers in October 1943, and was to suffer similar casualties on 11 January 1944 on missions to Oschersleben, Halberstadt and Brunswick. Lieutenant General James Doolittle, commander of the Eighth, had ordered the second Schweinfurt mission to be cancelled as the weather deteriorated, but the lead units had already entered hostile air space and continued with the mission. Most of the escorts turned back or missed the rendezvous, and as a result 60 B-17s were destroyed. A third raid on Schweinfurt on 24 February 1944 highlighted what came to be known as "Big Week", during which the bombing missions were directed against German aircraft production. German fighters would have to respond, and the North American P-51 Mustang and Republic P-47 Thunderbolt fighters (equipped with improved drop tanks to extend their range) accompanying the American heavies all the way to and from the targets would engage them. The escort fighters reduced the loss rate to below seven percent, with only 247 B-17s lost in 3,500 sorties while taking part in the Big Week raids.

By September 1944, 27 of the 42 bomb groups of the Eighth Air Force and six of the 21 groups of the Fifteenth Air Force used B-17s. Losses to flak continued to take a high toll of heavy bombers through 1944, but by 27 April 1945 (two days after the last heavy bombing mission in Europe), the rate of aircraft loss was so low that replacement aircraft were no longer arriving and the number of bombers per bomb group was reduced. The Combined Bomber Offensive was effectively complete.

Pacific Theater

B-17C AAF S/N 40-2074 at Hickam Field. An onboard fire burnt the aircraft in two shortly after landing on 7 December 1941. One crewman was killed by Zero attack.

On 7 December 1941, a group of 12 B-17s of the 38th (four B-17C) and 88th (eight B-17E) Reconnaissance Squadrons, en route to reinforce the Philippines, were flown into Pearl Harbor from Hamilton Field, California, arriving during the attack on Pearl Harbor. Leonard "Smitty" Smith Humiston, co-pilot on First Lieutenant Robert H. Richards' B-17C, AAF S/N 40-2049, reported that he thought the U.S. Navy was giving the flight a 21-gun salute to celebrate the arrival of the bombers, after which he realized that Pearl Harbor was under attack. The Fortress came under fire from Japanese fighter aircraft, though the crew was unharmed with the exception of one member who suffered an abrasion on his hand. Enemy activity forced an abort from Hickam Field to Bellows Field, where the aircraft overran the runway and into a ditch where it was then strafed. Although initially deemed repairable, 40-2049 (11th BG / 38th RS) received more than 200 bullet holes and never flew again. Ten of the 12 Fortresses survived the attack.

B-17E BO AAF S/N 41-9211
Typhoon McGoon II of the 11th BG / 98th BS, taken in January 1943 in New Caledonia. The antennas mounted upon the nose were used for radar tracking surface vessels.

By 1941, the Far East Air Force (FEAF) based at Clark Field in the Philippines had 35 B-17s, with the War Department eventually planning to raise that to 165. When the FEAF received word of the attack on Pearl Harbor, General Lewis H. Brereton sent his bombers and fighters on various patrol missions to prevent them from being caught on the ground. Brereton planned B-17 raids on Japanese air fields in Formosa, in accordance with Rainbow 5 war plan directives, but this was overruled by General Douglas MacArthur. A series of disputed discussions and decisions, followed by several confusing and false reports of air attacks, delayed the authorization of the sortie. By the time the B-17s and escorting Curtiss P-40 Warhawk fighters were about to get airborne, they were destroyed by Japanese bombers of the 11th Air Fleet. The FEAF lost half its aircraft during the first strike, and was all but destroyed over the next few days.

Another early World War II Pacific engagement on 10 December 1941 involved Colin Kelly who reportedly crashed his B-17 into the Japanese battleship Haruna, which was later acknowledged as a near bomb miss on the heavy cruiser Ashigara. Nonetheless, this deed made him a celebrated war hero. Kelly's B-17C AAF S/N 40-2045 (19th BG / 30th BS) crashed about from Clark Field after he held the burning Fortress steady long enough for the surviving crew to bail out. Kelly was posthumously awarded the Distinguished Service Cross. Noted Japanese ace Saburo Sakai is credited with this kill, and in the process, came to respect the ability of the Fortress to absorb punishment.

B-17s were used in early battles of the Pacific with little success, notably the Battle of Coral Sea and Battle of Midway. While there, the Fifth Air Force B-17s were tasked with disrupting the Japanese sea lanes. Air Corps doctrine dictated bombing runs from high altitude, but it was soon discovered that only one percent of their bombs hit targets. However, B-17s were operating at heights too great for most A6M Zero fighters to reach, and the B-17's heavy gun armament was more than a match for lightly protected Japanese aircraft.

On 2 March 1943, six B-17s of the 64th Squadron attacked a major Japanese troop convoy from during the early stages of the Battle of the Bismarck Sea, off New Guinea, using skip bombing to sink three merchant ships including the Kyokusei Maru. A B-17 was shot down by a New Britain-based A6M Zero, whose pilot then machine-gunned some of the B-17 crew members as they descended in parachutes and attacked others in the water after they landed. Later, 13 B-17s bombed the convoy from medium altitude, causing the ships to disperse and prolonging the journey. The convoy was subsequently all but destroyed by a combination of low level strafing runs by Royal Australian Air Force Beaufighters, and skip bombing by USAAF North American B-25 Mitchells at 100 ft (30 m), while B-17s claimed five hits from higher altitudes.

A peak of 168 B-17 bombers were in the Pacific theater in September 1942, with all groups converting to other types by mid-1943. In mid-1942, Gen. Arnold decided that the B-17 was inadequate for the kind of operations required in the Pacific and made plans to replace all of the B-17s in the theater with B-24s as soon as they became available. Although the conversion was not complete until mid-1943, B-17 combat operations in the Pacific theater came to an end after a little over a year. Surviving aircraft were reassigned to the 54th Troop Carrier Wing's special airdrop section, and were used to drop supplies to ground forces operating in close contact with the enemy. Special airdrop B-17s supported Australian commandos operating near the Japanese stronghold at Rabaul, which had been the primary B-17 target in 1942 and early 1943.

Bomber defense

Part of a USAAF stream of over 1,000 B-17s

Before the advent of long-range fighter escorts, B-17s had only their .50 caliber M2 Browning machine guns to rely on for defense during the bombing runs over Europe. As the war intensified, Boeing used feedback from aircrews to improve each new variant with increased armament and armor. The number of defensive guns increased from four machine guns and one nose machine gun in the B-17C, to thirteen machine guns in the B-17G. But because the bombers could not maneuver when attacked by fighters, and needed to be flown straight and level during their final bomb run, individual aircraft struggled to fend off a direct attack.

German training model on how to attack a "flying porcupine" (fliegendes Stachelschwein)

A 1943 survey by the USAAF found that over half the bombers shot down by the Germans had left the protection of the main formation. To address this problem, the United States developed the bomb-group formation, which evolved into the staggered combat box formation where all the B-17s could safely cover any others in their formation with their machine guns, making a formation of the bombers a dangerous target to engage by enemy fighters. Luftwaffe fighter pilots likened attacking a B-17 combat box formation to encountering a fliegendes Stachelschwein, "flying porcupine", with dozens of machine guns on a combat box formation of bombers, aimed at them from almost every direction. However, the use of this rigid formation meant that individual aircraft could not engage in evasive maneuvers: they had to fly constantly in a straight line, which made them vulnerable to the German flak. Moreover, German fighter aircraft later used the tactic of high-speed strafing passes rather than engaging with individual aircraft to inflict damage with minimum risk.

As a result, the B-17s' loss rate was up to 25% on some early missions (60 of 291 B-17s were lost in combat on the second Raid on Schweinfurt), and it was not until the advent of long-range fighter escorts (particularly the North American P-51 Mustang) resulting in the degradation of the Luftwaffe as an effective interceptor force between February and June 1944, that the B-17 became strategically potent.

Formation flying through dense flak over Merseburg, Germany

The B-17 was noted for its ability to absorb battle damage, still reach its target and bring its crew home safely. Wally Hoffman, a B-17 pilot with the Eighth Air Force during World War II, said, "The plane can be cut and slashed almost to pieces by enemy fire and bring its crew home." Martin Caidin reported one instance in which a B-17 suffered a mid-air collision with a Focke-Wulf Fw 190, losing an engine and suffering serious damage to both the starboard horizontal stabilizer and the vertical stabilizer, and being knocked out of formation by the impact. The B-17 was reported as shot down by observers, but it survived and brought its crew home without injury. Its toughness was compensation for its shorter range and lighter bomb load compared to the B-24 and British Avro Lancaster heavy bombers. Stories abound of B-17s returning to base with tails having been destroyed, with only a single engine functioning or even with large portions of wings having been damaged by flak. This durability, together with the large operational numbers in the Eighth Air Force and the fame achieved by the Memphis Belle, made the B-17 a key bomber aircraft of the war. Other factors such as combat effectiveness and political issues also contributed to the B-17's success.

The B-17 design went through eight major changes over the course of its production, culminating in the B-17G, differing from its immediate predecessor by the addition of a bombardier-operated, remotely controlled chin turret with two caliber M2 Browning machine guns under the nose, also fitted to the final eighty-six production aircraft of the B-17F-DLs built by Douglas, after being first tried in May 1943 as part of the increased armament system of the YB-40. This eliminated the B-17's main defensive weakness in head-on attacks.

Luftwaffe attacks

The severely damaged B-17, "All-American" continues to fly after an attacking Bf 109 fighter collided with the aircraft. The B-17 flew home and landed in this condition without major injuries to any of the crew members.

After examining wrecked B-17s and B-24s, Luftwaffe officers discovered that on average it took around 20 hits with 20 mm shells fired from the rear to bring them down. Pilots of average ability hit the bombers with only about two percent of the rounds they fired, so to obtain 20 hits, the average pilot had to fire one thousand 20 mm (0.79 in) rounds at a bomber. Early versions of the Fw 190, one of the best German interceptor fighters, were equipped with two 20 mm (0.79 in) MG FF cannons, which carried only 500 rounds when belt-fed (normally using 60-round drum magazines in earlier installations), and later with the better Mauser MG 151/20 cannons, which had a longer effective range than the MG FF weapon. Later versions carried four or even six MG 151/20 cannon and twin 13 mm machine guns. The German fighters found that when attacking from the front, where fewer defensive guns were mounted (and where the pilot was exposed and not protected by armor as he was from the rear), it took only four or five hits to bring a bomber down. To rectify the Fw 190's shortcomings, the number of cannons fitted was doubled to four with a corresponding increase in the amount of ammunition carried, creating the Sturmbock bomber destroyer version. This type replaced the vulnerable twin-engine Zerstörer heavy fighters which could not survive interception by P-51 Mustangs flying well ahead of the combat boxes in an air supremacy role starting very early in 1944 — as ordered by the Eighth Air Force's commander, then-Maj. Gen. Jimmy Doolittle — to clear any Luftwaffe defensive fighters from the skies. By 1944, a further upgrade to Rheinmetall-Borsig's 30 mm (1.2 in) MK 108 cannons mounted either in the wing, or in underwing, conformal mount gun pods, was made for the Sturmbock Focke-Wulfs as either the /R2 or /R8 field modification kits, enabling aircraft to bring a bomber down with just a few hits.

B-17G-15-BO "Wee Willie", 322d BS, 91st BG, after direct flak hit on her 128th mission.

The adoption of the 21 cm Nebelwerfer-derived Werfer-Granate 21 (Wfr. Gr. 21) rocket mortar by the Luftwaffe in mid-August 1943 promised the introduction of a major "stand-off" style of offensive weapon – one strut-mounted tubular launcher was fixed under each wing panel on the Luftwaffe's single-engine fighters, and two under each wing panel of a few twin-engine Bf 110 daylight Zerstörer aircraft. However, due to the slow 715 mph velocity and characteristic ballistic drop of the fired rocket (despite the usual mounting of the launcher at about 15° upward orientation), and the small number of fighters fitted with the weapons, the Wfr. Gr. 21 never had a major effect on the combat box formations of Fortresses. The Luftwaffe also fitted heavy-calibre Bordkanone-series 37, 50 and even cannon as anti-bomber weapons on twin-engine aircraft such as the special Ju 88P fighters, as well as one model of the Me 410 Hornisse but these measures did not have much effect on the American strategic bomber offensive. The Me 262, however, had moderate success against the B-17 late in the war. With its usual nose-mounted armament of four MK 108 cannons, and with some examples later equipped with the R4M rocket, launched from underwing racks, it could fire from outside the range of the bombers' defensive guns and bring an aircraft down with one hit, as both the MK 108's shells and the R4M's warheads were filled with the "shattering" force of the strongly brisant Hexogen military explosive.

Captured B-17F-27-BO in Luftwaffe markings, the USAAF-named "Wulfe-Hound", 41-24585, of the 360th BS/303rd BG, downed on 12 December 1942 near Leeuwarden, Netherlands, while on a raid on Rouen, France, the first Flying Fortress to fall intact into German hands. Operated by Kampfgeschwader 200 from March 1944.

Luftwaffe-captured B-17s

During World War II, after crash-landing or being forced down, approximately 40 B-17s were captured and refurbished, with about a dozen put back into the air. Given German Balkenkreuz national markings on their wings and fuselage sides, and "Hakenkreuz" swastika tail fin-flashes, the captured B-17s were used to determine the B-17's vulnerabilities and to train German interceptor pilots in attack tactics. Others, with the cover designations Dornier Do 200 and Do 288, were used as long-range transports by the Kampfgeschwader 200 special duties unit, carrying out agent drops and supplying secret airstrips in the Middle East and North Africa. They were chosen specifically for these missions as being more suitable for this role than other available German aircraft; they never attempted to deceive the Allies and always wore full Luftwaffe markings. One B-17 of KG200, bearing the Luftwaffe's KG 200 Geschwaderkennung (combat wing code) markings A3+FB, was interned by Spain when it landed at Valencia airfield, 27 June 1944, remaining there for the rest of the war. It has been alleged that some B-17s kept their Allied markings and were used by the Luftwaffe in attempts to infiltrate B-17 bombing formations and report on their positions and altitudes. According to these allegations, the practice was initially successful, but Army Air Force combat aircrews quickly developed and established standard procedures to first warn off, and then fire upon any "stranger" trying to join a group's formation.

Soviet-interned B-17s

The U.S. did not offer B-17s to the Soviet Union as part of its war materiel assistance program, but at least 73 aircraft were acquired by the Soviet Air Force. These aircraft had landed with mechanical trouble during the shuttle bombing raids over Germany or had been damaged by a Luftwaffe raid in Poltava. The Soviets restored 23 to flying condition and concentrated them in the 890th bomber regiment of the 45th bomber division, but they never saw combat. In 1946 the regiment was assigned to the Kazan factory to aid in the Soviet effort to reproduce the more advanced Boeing B-29 as the Tupolev Tu-4.

Swiss-interned B-17s

During the war, the Allied bomber offensive sometimes took U.S. or British bombers into Swiss airspace, either damaged craft seeking safety or on rare occasions bombing Swiss cities by accident. Swiss aircraft would attempt to intercept and force individual aircraft to land, interning their crews; one Swiss pilot was killed, shot down by a U. S. bomber crew in September 1944. From then on, red and white neutrality bands were added to the wings of Swiss aircraft to stop accidental attacks by Allied aircraft.

Official Swiss records identify 6,501 airspace violations during the course of the war, with 198 foreign aircraft landing on Swiss territory and 56 aircraft crashing there. In October 1943 the Swiss interned Boeing B-17F-25-VE, tail number 25841, and her U. S. flight crew after the Flying Fortress developed engine trouble and was forced to land following its bombing raid over Germany. The aircraft was then turned over to the Swiss Air Force, who then flew the bomber until the end of the war, using other interned but non-flyable B-17s for spare parts. The bomber was repainted a dark olive drab, but retained its light gray-painted under surfaces. It carried Swiss national white cross insignia in red squares on both sides of its rudder, fuselage sides, and the underside wings, with white crosses in red roundels atop both upper wings. As on its gray under surfaces, the B-17F also carried light gray flash letters "RD" and "I" on either side of the Swiss national insignia.

Japanese-captured B-17s

This Philippines-captured USAAF Boeing B-17D, in Japanese livery, was flown to Japan for technical evaluation.

Three damaged B-17s, one "D" model and two "E" models, were rebuilt to flying status by Japanese technicians and mechanics; the parts used were stripped from captured B-17 wrecks in both the Philippines and the Netherlands East Indies. The three bombers, containing captured top secret Norden Bombsights, were then flown to Japan where they underwent extensive technical evaluation by the Imperial Japanese Army Air Force's Air Technical Research Laboratory (Koku Gijutsu Kenkyujo). The "D" model was later deemed an obsolete design and the two "E" models were used to develop B-17 air combat counter-tactics; they were also used as enemy aircraft in several Japanese propaganda films. No traces of these captured Flying Fortresses were found in Japan by Allied occupation forces following the war; they were assumed scrapped late in the war for their vital war materials.One of these flying fortresses has been spotted and photographed by US Army and codenamed Tachikawa 105 after photo analyzed its wing span.

Postwar history

U.S. Air Force

BQ-17 Flying Fortress Drones over New Mexico, April 1946.

Following the end of World War II, the B-17 was quickly phased out of use as a bomber and the Army Air Forces retired most of its fleet. Flight crews ferried the bombers back across the Atlantic to the United States where the majority were sold for scrap and melted down, although significant numbers remained in use in second-line roles such as VIP transports, air-sea rescue and photo-reconnaissance. Strategic Air Command (SAC), established in 1946, used reconnaissance B-17s (at first called F-9 [F for Fotorecon], later RB-17) until 1949. With the disestablishment of the U.S. Army Air Forces and the establishment of an independent U.S. Air Force in 1947, most extant B-17s were transferred to USAF.

The USAF Air Rescue Service of the Military Air Transport Service (MATS) operated B-17s as so-called "Dumbo" air-sea rescue aircraft. Work on using B-17s to carry airborne lifeboats had begun in 1943, but they entered service in the European theater only in February 1945, also being used to provide search and rescue support for B-29 raids against Japan. About 130 B-17s were converted to the air-sea rescue role, at first designated B-17H and later SB-17G. Some SB-17s had their defensive guns removed, while others retained their guns to allow use close to combat areas. The SB-17 served through the Korean War, remaining in service with USAF until the mid-1950s.

See also: 3205th Drone Group

In 1946, surplus B-17s were chosen as drone aircraft for atmospheric sampling during the Operation Crossroads atomic bomb tests, being able to fly close to or even through the mushroom clouds without endangering a crew. This led to more widespread conversion of B-17s as drones and drone control aircraft, both for further use in atomic testing and as targets for testing surface-to-air and air-to-air missiles. One hundred and seven B-17s were converted to drones. The last operational mission flown by a USAF Fortress was conducted on 6 August 1959, when a DB-17P, serial 44-83684 directed a QB-17G, out of Holloman Air Force Base, New Mexico, as a target for an AIM-4 Falcon air-to-air missile fired from an McDonnell F-101 Voodoo. A retirement ceremony was held several days later at Holloman AFB, after which 44-83684 was retired. It was subsequently used in various films and in the 1960s television show 12 O'Clock High before being retired to the Planes of Fame aviation museum in Chino, California. Perhaps the most famous B-17, the Memphis Belle, is currently being fastidiously restored — simultaneously with the B-17D The Swoose — to its World War II wartime appearance by the National Museum of the United States Air Force at Wright-Patterson Air Force Base, Ohio.

U.S. Navy and U.S. Coast Guard

Under project Cadillac II, an AN/APS-20 radar was fitted onto the B-17G, making the PB-1W the first AWACS.

The U.S. Coast Guard PB-1G carried a droppable lifeboat.

During the last year of World War II and shortly thereafter, the United States Navy acquired 48 ex-USAAF B-17s for patrol and air-sea rescue work. The first two ex-USAAF B-17s, a B-17F (later modified to B-17G standard) and a B-17G were obtained by the Navy for various development programs. At first, these aircraft operated under their original USAAF designations, but on 31 July 1945 they were assigned the naval aircraft designation PB-1, a designation which had originally been used in 1925 for the Boeing Model 50 experimental flying boat.

Thirty-two B-17Gs were used by the Navy under the designation PB-1W, the suffix -W indicating an airborne early warning role. A large radome for an S-band AN/APS-20 search radar was fitted underneath the fuselage and additional internal fuel tanks were added for longer range, with the provision for additional underwing fuel tanks. Originally, the B-17 was also chosen because of its heavy defensive armament, but this was later deleted. These aircraft were painted dark blue, a standard Navy paint scheme which had been adopted in late 1944. The PB-1W eventually evolved into an early warning aircraft by virtue of its APS-20 search radar. PB-1Ws continued in USN service until 1955, gradually being phased out in favor of the Lockheed WV-2 (known in the USAF as the EC-121, a designation adopted by USN in 1962), a military version of the Lockheed 1049 Constellation commercial airliner.

In July 1945, 16 B-17s were transferred to the Coast Guard via the Navy; these aircraft were initially assigned U.S. Navy Bureau Numbers (BuNo), but were delivered to the Coast Guard designated as PB-1Gs beginning in July 1946. Coast Guard PB-1Gs were stationed at a number of bases in the U.S. and Newfoundland, with five at Coast Guard Air Station Elizabeth City, North Carolina, two at CGAS San Francisco, two at NAS Argentia, Newfoundland, one at CGAS Kodiak, Alaska, and one in Washington state. They were used primarily for air-sea rescue, but were also used for iceberg patrol duties and for photo mapping. Air-sea rescue PB-1Gs usually carried a droppable lifeboat underneath the fuselage and the chin turret was often replaced by a radome. The Coast Guard PB-1Gs served throughout the 1950s, the last example not being withdrawn from service until 14 October 1959.

Special operations

A number of B-17s were used by the CIA front companies Civil Air Transport, Air America and Intermountain Aviation for special missions. These included B-17G 44-85531, registered as N809Z. These aircraft were primarily used for agent drop missions over the People's Republic of China, flying from Taiwan, with Taiwanese crews. Four B-17s were shot down in these operations.

In 1957 the surviving B-17s had been stripped of all weapons and painted black. One of these Taiwan-based B-17s was flown to Clark Air Base in the Philippines in mid-September, assigned for covert missions into Tibet.

On 28 May 1962, N809Z, piloted by Connie Seigrist and Douglas Price, flew Major James Smith, USAF and Lieutenant Leonard A. LeSchack, USNR to the abandoned Soviet arctic ice station NP 8, as Operation Coldfeet. Smith and LeSchack parachuted from the B-17 and searched the station for several days. On 1 June, Seigrist and Price returned and picked up Smith and LeSchack using a Fulton Skyhook system installed on the B-17. N809Z was used to perform a Skyhook pick up in the James Bond movie Thunderball in 1965. This aircraft, now restored to its original B-17G configuration, is on display in the Evergreen Aviation & Space Museum in McMinnville, Oregon.

Operators

Military operators of the B-17

Civil operators of the B-17

Main article: List of B-17 Flying Fortress operators

The B-17 was a versatile aircraft, serving in dozens of USAAF units in theaters of combat throughout World War II, and in non-bomber roles for the RAF. Its main use was in Europe, where its shorter range and smaller bombload relative to other aircraft available did not hamper it as much as in the Pacific Theater. Peak USAAF inventory (in August 1944) was 4,574 worldwide.

• Austria
• Argentina
• Bolivia
• Brazil
• Canada
• Colombia
• Denmark
• Dominican Republic
• France
• Germany as Beuteflugzeug (captured aircraft)
• Iran
• Saudi Arabia
• Israel
• Japan
• Mexico
• Nicaragua
• Peru
• Portugal
• South Africa
• ROC
• Soviet Union
• Switzerland
• Sweden
• United Kingdom
• United States

Survivors

Main article: List of surviving Boeing B-17 Flying Fortresses

Fortresses as a symbol

The B-17's capacity to repel enemy attacks and still inflict heavy damage upon German military capability and production centers is rendered in this caricature.

B-17G 43-38172 of the 8th AF 398th BG 601st BS which was damaged on a bombing mission over Cologne, Germany, on 15 October 1944; the bombardier was killed.

The B-17 Flying Fortress has become, for many reasons, an icon of American power and a symbol of its Air Force. During the 1930s, the USAAC, as articulated by then-Major General Frank Maxwell Andrews and the Air Corps Tactical School, touted the bomber as a strategic weapon. General Henry H. Arnold, Chief of the Air Corps, recommended the development of bigger aircraft with better performance, and the Tactical School agreed.

When the Model 299 was rolled out on 28 July 1935, bristling with multiple machine gun installations, Richard Williams, a reporter for The Seattle Times coined the name "Flying Fortress" with his comment, "Why, it's a flying fortress!" Boeing was quick to see the value of the name and had it trademarked for use. In 1943, Consolidated Aircraft commissioned a poll to see "to what degree the public is familiar with the names of the Liberator and the Flying Fortress." Of 2,500 men in cities where Consolidated adverts had been run in newspapers, 73% had heard of the B-24, while 90% knew of the B-17.

After the initial B-17s were delivered to the Air Corps 2nd Bombardment Group, they were used on promotional flights emphasizing their great range and navigational precision. In January 1938, group commander Colonel Robert Olds flew a YB-17 from the east to west coast, setting a transcontinental record of 13 hours 27 minutes. He also broke the west-to-east coast record on the return trip, averaging 245 mph (394 km/h) in 11 hours 1 minute. Six bombers of the 2nd Bombardment Group took off from Langley Field on 15 February 1938 as part of a goodwill flight to Buenos Aires, Argentina. Covering 12,000 miles (19,000 km) they returned on 27 February, with seven aircraft setting off on a flight to Rio de Janeiro, Brazil, three days later. In a well-publicized mission on 12 May of the same year, three B-17s "intercepted" and took photographs of the Italian ocean liner SS Rex 610 miles (980 km) off the Atlantic coast.

Many pilots who flew both preferred the B-17 over the B-24 for its greater stability and ease in formation flying. Its electrical systems were less vulnerable to damage than the B-24's hydraulics, and the B-17 flew better than the B-24 when missing an engine. During the war, the largest offensive bombing force, the Eighth Air Force, had an open preference for the B-17. Lieutenant General Jimmy Doolittle wrote about his preference for equipping the Eighth with B-17s, citing the logistical advantage in keeping field forces down to a minimum number of aircraft types with their individual servicing and spares. For this reason, he wanted B-17 bombers and P-51 fighters for the Eighth. His views were supported by Eighth Air Force statisticians, whose studies showed that Fortresses had utility and survivability much greater than that of the B-24. Making it back to base on numerous occasions despite extensive battle damage, its durability became mythical; stories and photos of B-17s surviving battle damage were widely circulated during the war. Despite an inferior performance and smaller bombload than the more numerous B-24, a survey of Eighth Air Force crews showed a much higher rate of satisfaction in the B-17.

Notable B-17s

B-17G Shoo Shoo Baby

• All American — B-17F tail# 124406 survived having her tail almost cut off in a collision over Tunisia, but made it back to base in Algeria — there are false stories that claim it made it back to Britain. It flew again, but was later scrapped.
• Aluminum Overcast — flying example.
• Chief Seattle — sponsored by the city of Seattle, it disappeared (MIA) on 14 Aug 1942 flying a recon mission for the 19th BG, 435th BS and the crew declared dead on 7 Dec 1945.
• Hell's Kitchen — B-17F 41-24392 one of only three early B-17F's in 414th BS to complete more than 100 combat missions.
• I'll Be Around — B-17G in the 390th Bomb Group Museum at the Pima Air and Space Museum adjacent to Davis-Monthan AFB near Tucson, AZ.
• Lady Helene — Donald Lederman, pilot; John Palooka, co-pilot; William Martin, waist gunner; August Cervitti, waist Gunner; Frank Serene, radio operator; Willard Dingley, engineer; Len Carmell, navigator; Paul Redkorvich, Toggel, (bombardier), Erwin Chojnacki, ball turret gunner. 33 missions January - April 1945.
• Liberty Belle — former engine testbed restored as flying example, destroyed in a forced landing on 13 June 2011, outside of Chicago, Illinois; no fatalities.
• Mary Ann — a B-17D that was part of an unarmed flight which left San Francisco on 6 December 1941 en route to Hickam Field in Hawaii, arriving during the attack on Pearl Harbor. The plane and its crew were immediately forced into action on Wake Island and in the Philippines during the outbreak of World War II. It became famous when its exploits were featured in Air Force, one of the first of the patriotic war films released in 1943.
• Memphis Belle — one of the first B-17s to complete a tour of duty of 25 missions in the 8th Air Force, now being restored for display at the National Museum of the U.S. Air Force at Wright-Patterson AFB in Dayton, Ohio.
• Miss Every Morning Fix'n — B 17C. Previously named 'Pamela'. Stationed in Mackay, Queensland, Australia during World War II. On 14 June 1943, crashed shortly after takeoff from Mackay while ferrying U.S. forces personnel back to Port Moresby. 40 of the 41 people on board were killed. It remains the worst air disaster in Australian history. The sole survivor, Foye Roberts, married an Australian and returned to the States. He died in Wichita Falls on 4 February 2004.
• Murder Inc. — A B-17 bombardier wearing the name of the B-17 "Murder Inc." on his jacket was used for propaganda in German newspapers.
• My Gal Sal
• Nine-O-Nine — flying example, Collings Foundation of Stow, Massachusetts.

The 909 arriving at Marana Regional Airport. 23 April 2010

• Old 666 — the B-17 flown by the most highly decorated crew in the Pacific Theater
• Piccadilly Lilly II — 200th from last B-17G to be built, used in the movie Twelve O'Clock High. As of 2011, currently being restored to Flight status, at the Planes of Fame museum.
• (The) Pink Lady
• Rosie's Riveters — B-17F bearing serial 42-30758 from the 100th Bomb Group and commanded by highly decorated USAAF officer Robert Rosenthal, it was the lone surviving 100th BG B-17 of the 10 October 1943 raid against Münster to return to the unit's base at Thorpe Abbots.
• Sally B — The last flying example in Europe.
• Sentimental Journey — flying example, Commemorative Air Force at Airbase Arizona, Mesa Arizona.
• Shoo Shoo Baby
• Sir Baboon McGoon featured in June 1944 issue of Popular Science magazine and 1945 issue of Flying magazine. Articles discuss mobile recovery crews following Oct 1943 belly landing at Tannington, England, but omit return to service in Feb 1944 and seven additional missions. Final crew called it "a real crate" and successfully ditched into the North Sea on 29 Mar 1944, a few months before the first article appeared in print.
• Swamp Ghost B-17E Serial Number 41-2446, a rare surviving "E" model recovered from a Papua New Guinea swamp, now at Pacific Aviation Museum Pearl Harbor.
• The Swoose — Also nicknamed Ole Betsy while in service, The Swoose is the only remaining intact B-17D, built in 1940, and the oldest surviving Flying Fortress; it is in the collection of the Smithsonian's Air and Space Museum and is being restored for final display at the National Museum of the U.S. Air Force at Wright-Patterson AFB in Dayton, Ohio, simultaneously with B-17F "Memphis Belle." The Swoose was flown by Frank Kurtz, father of actress Swoosie Kurtz, who named his daughter after the bomber.
• Texas Raiders — flying example. Last U.S. Navy PB-1W flying, Commemorative Air Force Gulf Coast Wing in Houston, Texas.
• Thunderbird
• Yankee Lady — flying example, Yankee Air Force.
• Ye Olde Pub — the B-17 that Franz Stigler did not shoot down, as memorialized in the painting "A Higher Call" by John D. Shaw.
• 5 Grand — 5,000th B-17 made, emblazoned with Boeing employee signatures, served with the 333rd Bomb Squadron, 96th Bomb Group in Europe. Damaged and repaired after gear-up landing, transferred to 388th Bomb Group. Returned from duty following V-E Day, flown for war bonds tour, then stored at Kingman, Arizona. Following an unsuccessful bid for museum preservation, the aircraft was scrapped.
• The So What? I and II — flown by "3 engine Zip" (I was shot down over Germany and II was decommissioned).

Accidents and incidents

Main article: Accidents and incidents involving the Boeing B-17 Flying Fortress

Noted B-17 pilots and crew members

Maynard H. Smith receiving Medal of Honor from Secretary of War Henry L. Stimson.

Forrest L. Vosler receiving Medal of Honor from President Roosevelt.

L–R, Nancy Love, pilot and Betty (Huyler) Gillies, co-pilot, the first women to fly the Boeing B-17 Flying Fortress heavy bomber

Medal of Honor recipients

Many B-17 crew members received military honors and 17 received the Medal of Honor, the highest military decoration awarded by the United States:

• Brigadier General Frederick Castle (flying as co-pilot) – awarded posthumously for remaining at controls so others could escape damaged aircraft.
• 2nd Lt Robert Femoyer (navigator) – awarded posthumously
• 1st Lt Donald J. Gott (pilot) – awarded posthumously
• 2nd Lt David R. Kingsley (bombardier) – awarded posthumously for tending to injured crew and giving up his parachute to another
• 1st Lt William R. Lawley, Jr. – "heroism and exceptional flying skill"
• Sgt Archibald Mathies (engineer-gunner) – awarded posthumously
• 1st Lt Jack W. Mathis (bombardier) – posthumously, the first airman in the European theater to be awarded the Medal of Honor
• 2nd Lt William E. Metzger, Jr. (Co-pilot) – awarded posthumously
• 1st Lt Edward Michael
• 1st Lt John C. Morgan
• Capt Harl Pease (awarded posthumously)
• 2nd Lt Joseph Sarnoski (awarded posthumously)
• S/Sgt Maynard H. Smith (gunner)
• 1st Lt Walter E. Truemper (awarded posthumously)
• T/Sgt Forrest L. Vosler (radio operator)
• Brig Gen Kenneth Walker (not part of crew at time) – awarded posthumously
• Maj Jay Zeamer, Jr. (pilot) – earned on unescorted reconnaissance mission

Other military achievements or events

• Lincoln Broyhill, The 483rd Bombardment Group received a Distinguished Unit Citation, and Broyhill set two individual records that day: (1) most German jets destroyed by a single gunner in one mission (two), and (2) most German jets destroyed by a single gunner during the entire war (two).
• Allison C. Brooks (1917–2006): Was awarded numerous military decorations, and was ultimately promoted to the rank of major general and served in active duty until 1971.
• 1st Lt Eugene Emond (1921–1998): Lead pilot for Man O War II Horsepower Limited. Received the Distinguished Flying Cross, Air Medal with three oak leaf clusters, American Theater Ribbon and Victory Ribbon. Was part of D-Day and witnessed one of the first German jets when a Me 262A-1a flew through his formation over Germany. One of the youngest bomber pilots in the U.S. Army Air Forces.
• Immanuel J. Klette (1918–1988): Second-generation German-American whose 91 combat missions were the most flown by any Eighth Air Force pilot in World War II.
• Capt Colin Kelly (1915–1941): Pilot of the first U.S. B-17 lost in action.
• Col Frank Kurtz (1911–1996): The USAAF's most decorated pilot of World War II. Commander of the 463rd Bombardment Group (Heavy), 15th Air Force, Celone Field, Foggia, Italy. Clark Field Philippines attack survivor. Olympic bronze medalist in diving (1932), 1944–1945. Father of actress Swoosie Kurtz, herself named for the still-surviving B-17D mentioned above.
• Gen Curtis LeMay (1906–1990): Became head of the Strategic Air Command and Chief of Staff of the USAF.
• Lt Col Nancy Love (1914–1976) and Betty (Huyler) Gillies (1908–1998): The first women to be certified to fly the B-17, in 1943.
• Col Robert K. Morgan (1918–2004): Pilot of Memphis Belle.
• Lt Col Robert Rosenthal (1917–2007): Commanded the only surviving B-17, "Rosie's Riveters", of a US 8th Air Force raid by the 100th Bomb Group on Münster on 10 October 1943. Earned sixteen medals for gallantry (including one each from Britain and France), and led the raid on Berlin on 3 February 1945, that is likely to have ended the life of Roland Freisler, the Third Reich's infamous "hanging judge".
• 1st Lt Bruce Sundlun (1920–2011): Pilot of Damn Yankee of the 384th Bomb Group was shot down over Belgium on 1 December 1943 and evaded capture until reaching Switzerland 5 May 1944.
• Brig Gen Paul Tibbets (1915–2007): Flew with the 97th Bombardment Group (Heavy) with both the 8th Air Force in England and the 12th Air Force in North Africa. Later pilot of the B-29 Enola Gay, dropping the atomic bomb on Hiroshima, Japan.

B-17 in popular culture

Hollywood featured the B-17 in its period films, such as director Howard Hawks' Air Force starring John Garfield and Twelve O'Clock High starring Gregory Peck. Both films were made with the full cooperation of the United States Army Air Forces and used USAAF aircraft and (for Twelve O'Clock High) combat footage. In 1964, the latter film was made into a television show of the same name and ran for three years on ABC TV. Footage from Twelve O' Clock High was also used, along with three restored B-17s, in the 1962 film The War Lover. The B-17 also appeared in the 1938 movie Test Pilot with Clark Gable and Spencer Tracy, with Clark Gable in Command Decision in 1948, in Tora! Tora! Tora! in 1970, and in Memphis Belle with Matthew Modine, Eric Stoltz, Billy Zane, and Harry Connick, Jr. in 1990. The most famous B-17, the Memphis Belle, toured the U. S. with its crew to reinforce national morale (and to sell war bonds). It starred in a USAAF documentary, Memphis Belle: A Story of a Flying Fortress.

B-17's are seen flying (and crashing in flames) in the British film The Way to the Stars.

The B-17 has also been featured in artistic works expressing the physical and psychological stress of the combat conditions and the high casualty rates that crews suffered. Works such as The Death of the Ball Turret Gunner by Randall Jarrell and Heavy Metal (film)'s section "B-17" depict the nature of these missions. The Ball turret itself has inspired works like Steven Spielberg's The Mission. Artists who served on the bomber units also created paintings and drawings depicting the combat conditions in World War II.

Civilian achievements or events

• Martin Caidin (1927–1997): Author of Cyborg, the story that formed the basis of The Six Million Dollar Man wrote the saga of the last transatlantic formation flight of B-17s ever made, Everything But the Flak.
• Clark Gable (1901–1960): Academy Award-winning film actor, five missions as waist gunner with several groups from May to September 1943, including the B-17 Eight Ball of the 359th Bomb Squadron (351st Bomb Group).
• Irv Homer (1922–2009). Philadelphia Radio host served as 15th Air Force B-17 co-pilot during WW2.
• Tom Landry (1924–2000): American football player and coach, flew 30 missions over Europe in 1944–45 as a B-17 pilot with the 493rd Bomb Group, surviving a crash landing in Belgium. (His older brother Robert died in a B-17 crash)

Clark Gable with 8th AF B-17F with pre-Cheyenne tail position, in Britain, 1943

• Norman Lear: Radio operator, with the 463rd Bombardment Group (Heavy), 15th Air Force, Celone Field, Foggia, Italy; television producer of American sitcoms Sanford and Son, Maude and All in the Family, among others.
• Gene Roddenberry (1921–1991): Creator of Star Trek; flew B-17s for the 394th Bomb Squadron, 5th Bomb Group (H), in the Pacific theater.
• Robert Rosenthal (1917–2007): Assistant to the U.S. prosecutor at the Nuremberg Trials, where he interrogated Hermann Göring, pilot with the 100th Bomb Group.
• Brigadier General Robert Lee Scott, Jr. (1908–2006): Best known for his autobiography God is My Co-Pilot, about his exploits in World War II with the Flying Tigers and the United States Army Air Forces in China and Burma.
• James Stewart (1908–1997): Academy Award-winning film actor, instructed in B-17s before flying 20 combat missions in B-24s with the 8th Air Force, England; retired from Air Force Reserve as a Brigadier General.
• Bert Stiles (1920–1944): 91st Bomb Group co-pilot from March to October 1944, short-story author, killed in action flying a P-51 on a second tour.
• Bruce Sundlun (1920–2011): 384th Bomb Group Pilot of B-17F Damn Yankee avoided capture after being shot down over Jabbeke, Belgium, 1 December 1943 to become a lawyer, businessman and Governor of Rhode Island 1991–95.
• Smokey Yunick (1923–2001): Award-winning motorsports car designer and premier NASCAR crew chief flew 50 missions as a B-17 pilot with the 97th Bombardment Group (Heavy) of the 15th Air Force, out of Amendola Airfield, Foggia, Italy.
• Howard Zinn (1922-2010): Bombardier in the 490th Bombardment Group, Eighth Air Force, later political science professor at Boston University, author of A People's History of the United States, which has sold over 2 million copies.

Specifications (B-17G)

3-view projection of a B-17G, with inset detail showing the "Cheyenne tail" and some major differences with other B-17 variants

Data from The Encyclopedia of World Aircraft

General characteristics

• Crew: 10: Pilot, co-pilot, navigator, bombardier/nose gunner, flight engineer/top turret gunner, radio operator, waist gunners (2), ball turret gunner, tail gunner
• Length: 74 ft 4 in (22.66 m)
• Wingspan: 103 ft 9 in (31.62 m)
• Height: 19 ft 1 in (5.82 m)
• Wing area: 1,420 sq ft (131.92 m²)
• Airfoil: NACA 0018 / NACA 0010
• Aspect ratio: 7.57
• Empty weight: 36,135 lb (16,391 kg)
• Loaded weight: 54,000 lb (24,500 kg)
• Max. takeoff weight: 65,500 lb (29,700 kg)
• Powerplant: 4 × Wright R-1820-97 "Cyclone" turbosupercharged radial engines, 1,200 hp (895 kW) each

Performance

• Maximum speed: 287 mph (249 kn, 462 km/h)
• Cruise speed: 182 mph (158 kn, 293 km/h)
• Range: 2,000 mi (1,738 nmi, 3,219 km) with 2,700 kg (6,000 lb) bombload
• Service ceiling: 35,600 ft (10,850 m)
• Rate of climb: 900 ft/min (4.6 m/s)
• Wing loading: 38.0 lb/sq ft (185.7 kg/m²)
• Power/mass: 0.089 hp/lb (150 W/kg)

Armament

• Guns: 13 × .50 in (12.7 mm) M2 Browning machine guns in 8 positions (2 in the Bendix chin turret, 2 on nose cheeks, 2 staggered waist guns, 2 in upper Sperry turret, 2 in Sperry ball turret in belly, 2 in the tail and one firing upwards from radio compartment behind bomb bay)
• Bombs:
  • Short range missions (<400 mi): 8,000 lb (3,600 kg)
  • Long range missions (≈800 mi): 4,500 lb (2,000 kg)
  • Overload: 17,600 lb (7,800 kg)

See also

B-17 modified for testing of the XT-34 turboprop. When testing concluded, the aircraft was restored to stock configuration as the "Liberty Belle", but was lost in a post-forced-landing fire near Oswego, Illinois on 13 June 2011.

• Air warfare of World War II

• Boeing B-17 Flying Fortress variants
• B-17 Flying Fortress units of the United States Army Air Forces
• Accidents and incidents involving the B-17 Flying Fortress

Related development

• Boeing XB-15
• Boeing XB-38 Flying Fortress
• Boeing YB-40 Flying Fortress
• Boeing C-108 Flying Fortress

Aircraft of comparable role, configuration and era

• Avro Lancaster
• Consolidated B-24 Liberator
• Focke-Wulf Fw 200 Condor
• Handley Page Halifax
• Heinkel He 177
• Junkers Ju 290
• Petlyakov Pe-8
• Piaggio P.108B
• Short Stirling

Related lists

• List of bomber aircraft
• List of aircraft of World War II
• List of military aircraft of the United States

References

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Further reading

• Birdsall, Steve. The B-17 Flying Fortress. Dallas, Texas: Morgan Aviation Books, 1965.
• Davis, Larry. B-17 in Action. Carrollton, Texas: Squadron/Signal Publications, 1984. ISBN 0-89747-152-0.
• Jablonski, Edward. Flying Fortress. New York: Doubleday, 1965. ISBN 0-385-03855-0.
• Johnsen, Frederick A. Boeing B-17 Flying Fortress. Stillwater, Minnesota: Voyageur Press, 2001. ISBN 1-58007-052-3.
• Lloyd, Alwyn T. B-17 Flying Fortress in Detail and Scale, Vol. 11: Derivatives, Part 2. Fallbrook, California: Aero Publishers, 1983. ISBN 0-8168-5021-6.
• Lloyd, Alwyn T. B-17 Flying Fortress in Detail and Scale, Vol. 20: More derivatives, Part 3. Blue Ridge Summit, Pennsylvania: Tab Books, 1986. ISBN 0-8168-5029-1.
• Lloyd, Alwyn T. and Terry D. Moore. B-17 Flying Fortress in Detail and Scale, Vol. 1: Production Versions, Part 1. Fallbrook, California: Aero Publishers, 1981. ISBN 0-8168-5012-7.
• O'Leary, Michael. Boeing B-17 Flying Fortress (Osprey Production Line to Frontline 2). Botley, Oxford, UK: Osprey Publishing, 1999. ISBN 1-85532-814-3.
• Thompson, Scott A. Final Cut: The Post War B-17 Flying Fortress, The Survivors: Revised and Updated Edition. Highland County, Ohio: Pictorial Histories Publishing Company, 2000. ISBN 1-57510-077-0.
• Willmott, H.P. B-17 Flying Fortress. London: Bison Books, 1980. ISBN 0-85368-444-8.
• Wagner, Ray, "American Combat Planes of the 20th Century", Reno, Nevada, 2004, Jack Bacon & Company, ISBN 0-930083-17-2.

External links

• (1940) TO 01-20EC-1 Handbook of Operation and Flight Instructions for the Model B-17C Bombardment Airplane
• (1943) AN 01-20EF-1 Pilot's Flight Operating Instructions for Army Models B-17F and G – British Model Fortress II
• World War II 8th Air Force website