To mid-1943, most of the Flying Fortress are withdrawn from the Pacific Theater, located chemical p

In the 1930s the U.S. made 200 bomber production contract, was involved in the competition as well as Douglas and Glenn L Martin, chemical preservation of food Boeing design models to win the final, and even better than the original specifications required by the Army Air Corps. Prototype B-17 crashed in a contract canceled chemical preservation of food orders, but the Army Air Force Boeing B-17 design was impressed and ordered a 13, followed by the Army Air Corps to restore full production, including derivative type B-17A to B-17G. After the war because of rugged, many are used for forest fire fighting machine, until the 1980s the United chemical preservation of food States as well as a number of B-17 firefighting aircraft in use.
The new bomber will be able to stuff two oceans across the United States. This tender is called "A Plan", the emphasis on the feasibility study, but if the design chemical preservation of food proves to be successful, the military will order production prototype. Martin (Martin) and Boeing Aircraft Company submitted a preliminary design. Martin's design out before entered chemical preservation of food a substantive stage, Boeing designs (Model 294) has won a contract manufacturing prototype plane, the military designated Model XBLR-1 (ExperimentalBomber-LongRange the acronym), chemical preservation of food later renamed the XB-15, in the design process, Boeing received a four-engine aircraft manufacturing experience.
By XB-15, USAAC recognize "A plan" unrealistic performance chemical preservation of food targets, so reducing the requirement. In May 1934, USAAC began a second tender, the requirements are: capable of carrying 907 kg bombs to 322 kilometers per hour flying 3,218 kilometers multiple bombers. And "A Plan" program is different, the winner can get up to 220 orders. Including Boeing, including several major aircraft chemical preservation of food manufacturing companies invited to bid, all prototypes will be compared at Wright Field flight to elect the final winner. June 18, 1934 Boeing began preliminary design. The new design is basically a smaller version of the Model 294, and Model 294 as a four-released Bureau, this is the new design, the majority of his contemporaries bomber just installed two engines at that time. August 16, 1934 Boeing began manufacturing prototypes, the company Model Model 299.
Model 299 is designed chemical preservation of food to draw on the Boeing Model 247 all-metal commercial airliner lot of experience, basically aerodynamic and structural characteristics of the Model 247 and Model 294 Bureau released four combined. Aircraft equipped with four 750-horsepower Pratt (Pratt & Whitney) R-1690-E "Hornet" nine-cylinder air-cooled radial engine, driving three-blade propeller. Huge thick wing mounted beneath the fuselage of circular cross-section. Main landing gear stowed in the forward inside the engine compartment, the main income is not completely round the edges but also exposed in the air stream.
As the Boeing Model 299 prototype belongs to all, so the paint on the civil registration number X-13372. Crew prepared eight people, including the deputy pilot, bombardier, navigator / radio operator and four gunners. Streamlined body set up four machine gun turrets, one at the rear edge of the wing near the location of a second after the ventral edge of the wing position, the rear fuselage mounted one each on both sides of the waist, machine guns stand freely through internal rotation, the other in the transparent nose there is an additional machine gun bracket, each bracket can be mounted 7.62 mm or 12.7 mm machine guns, all guns are manually operated. Model 299's internal bomb bay can accommodate eight 272 kg bombs, chemical preservation of food maximum payload of 2,176 kg.
Performance: Maximum speed 436 km (sea level) / 475 km (7,620 meters), cruising speed of 370 kilometers. Service ceiling 11,582 meters. Maximum range of 3,862 kilometers (1,814 kg bomb load) / 5,792 km (no load).
Dimensions: wingspan 31.63 meters, a total length of 20.69 meters, chemical preservation of food 4.57 meters full height, wing area of 131.92 square meters.
Ordnance: chemical preservation of food a 7.62 mm machine gun, can be installed on either the front fuselage guns spherical seat. Sperry Model645473E a power rear turret, built two 12.7 mm Browning machine guns, 500 rounds chemical preservation of food of shells with every pretty. Belly a Sperry Model654849-J Power turret, built two 12.7 mm Browning machine guns, 500 rounds of shells with every pretty. 12.7 mm Browning machine guns on both sides of the waist all a machine, with each playing 400 rounds pretty. Tail two 12.7 mm Browning machine guns, 500 rounds of shells with every pretty. Internal bomb bay can be mounted up to 26 45 kg (100 lb) bombs or 16 136 kg (300 lb) bombs or 12 227 kg (500 lbs) bombs, or eight 454 kg (1,000 lb) bomb, or 4 907 kg (2,000 lb) bomb.
Ordnance: a 7.62 mm machine guns, 5,100 rounds of ammunition with a bomb box, can be installed on the front of the fuselage nose porthole at 6 spherical seat in any one of the machine guns. Sperry Model645473E a power rear turret, built two 12.7 mm Browning machine guns, 500 rounds of shells with every pretty. Belly a Sperry Model654849-J Power turret, built two 12.7 mm Browning machine guns, 500 rounds of shells with every pretty. Radio operator cabin 12.7 mm Browning machine guns, machine guns through the spherical seat at the top of the shooting. 12.7 mm Browning machine guns on both sides of the waist all a machine, with each playing 400 rounds pretty. Tail two 12.7 mm Browning machine guns, each with a bullet 565 very fat. Late (B-17F-70-BO to 130-BO, B-17F-35-DL to the 65-DL, B-17F-35-VE to 50-VE) chemical preservation of food on each side of the front fuselage mounted a cheek machine guns. Spherical seat temporary increase in gun guns are usually installed at the airport in the nose and front fuselage glass porthole in the middle.
B-17 bomber - the Pacific theater of the B-17
As the dark clouds of war, most of the Flying Fortress are stationed overseas. Stationed in the Panama Canal Zone (CanalZone) 6th Bombardment Group has eight B-17B, in early December 1941 received eight new B-17E. Stationed in Newfoundland 42nd Reconnaissance Squadron equipped with six B-17B, based in Salt Lake City, Utah (SaltLakeCity) 7th Bombardment Group has compiled over 35 new B-17E. Deployed in the Philippines 19th Bombardment chemical preservation of food Group has six B-17C and 29 B-17D, 19th Battalion of the 14th Squadron in September 1941 flew across the Pacific, the Philippines Clark (Clark) Airport, the brigade's other two squadrons flew to the Philippines in October. Deployed in Xiaweiyixi Keim (Hickam) chemical preservation of food Airport 5th Bombardment Group has 12 B-17D. USAAC rest of the brigade of heavy bombers equipped with a total of 12 YB-17, 22 架 B-17B and five B-17C.
USAAC's B-17 combat involvement inadvertently. December 7th, 38th Reconnaissance Squadron 4 B-17C and two new B-17E from California Hamilton (Hamilton) airport to the Philippines, stopover at Pearl Harbor, these aircraft unarmed. Because of this transition, so that the Japanese attack on Pearl Harbor Leida Yuan fleet mistaken chemical preservation of food B-17, but no alarm. B-17 flew in formation at the end of the first wave of attacks on Pearl Harbor, in the confusion to try on some aircraft Haleiwa (Haleiwa) airport runway shorter fighter forced landing, made a forced landing on the golf course, the rest of the aircraft braved Zero fighters strafed in Xi Kaimu landing. 5th Battalion 12 bomber B-17D outdoor parked in Xi Kaimu airport, the result five were destroyed, eight were wounded.
Taking into account no suitable fighter escort for the B-17, plans to attack Taiwan, has been delayed. In order to avoid repeating the mistakes of Pearl Harbor, the Japanese pre-emptive air strikes from the ground to destroy, all Clark airport to fly B-17 was ordered off in the waters around Luzon circling. At this time, the air force commander MacArthur Lewis. H. Brereton (LewisH.Brereton) General finally got permission to Taiwan raid, then orders circling B-17 returned Clark. Where three cameras mounted reconnaissance chemical preservation of food mission to prepare the remaining aircraft will mount a 45 kg (100 lbs) and 136 kg (300 lb) bombs.
In this day of the attack, the story of Captain Kelly quite legendary. Colin. P. Kelly (ColinP.Kelly) chemical preservation of food squadron at December 10 Clark airport to fly back to the north and refuel hanging bombs to attack the Japanese fleet. Kelly's B-17D had not dispatched due to a fault, only driving a B-17C launch. Kelly's northernmost Luzon bomb in a Japanese warship hit and burst into a huge fire. When the B-17 returned Clark airport when bitten Zero fighters, one of the driving Saburo Sakai, shells filled with fuel ignited wing, his B-17 burst into flames. Kelly command the crew bailed out, he stayed on the plane, and the plane together Zaijin the sea. Saburo Sakai shot down his first record in the B-17 bomber aircraft, Sakai later said in his memoirs B-17 body strong, extremely difficult to shoot down, and fast, zero ramped up before the war to catch up. The crew reported that they survived the sinking of a Japanese battleship possible, then the sound of a failure, the Americans eager to returns chemical preservation of food from the frontline exciting chemical preservation of food good news. So Kelly's deeds have been exaggerated returned home - the sinking of the Japanese battleship Haruna name, Captain Kelly brave performance because President Roosevelt was posthumously awarded for excellence in service Cross. According to the post-war years, the enemy information obtained showing that Haruna is not in this sea, the warship is likely to be a cruiser, but suffered chemical preservation of food only minor injuries new B-17E has a large vertical tail began to replenish depleted Early-type B-17 fleet, B-17E tail guns let into the attack from behind have become accustomed to the Japanese pilots by surprise. So those "unfortunate" B-17 crew driving early type also own aircraft tail plug two sticks, I hope the Japanese think it is two machine guns. In actual combat chemical preservation of food quickly discovered, B-17E belly turret remote does not work well, depending chemical preservation of food on the complexity of the Week mirror aiming system that is often confused with the gunner's sight is not aimed at any target, reflecting the defect after Boeing, remote turret quickly The famous ball turret replaced.
To mid-1943, most of the Flying Fortress are withdrawn from the Pacific Theater, located chemical preservation of food farther to let the B-24 Liberator. B-24 is more suitable for the Pacific region, with higher speed and larger in the high-altitude chemical preservation of food payload. In addition, in the European theater lost a huge number of B-17, so that all the produce B-17 supplement chemical preservation of food and should chemical preservation of food be used to meet the training needs of the European battlefield. In the Bismarck Sea (BismarckSea) Shortly after the war, no B-17 was sent to the Pacific Ocean. B-17 is the main battlefields of Europe, where it won fame with great sacrifice. In fact, B-17 took on 98% of European operations.
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