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B-25 "Mitchell" in the USSR![]() North American B-25 "Mitchell" bomber was delivered in 1941-1945 to the USSR in significant quantities and. since the middle of the war, it has been a significant part of the long-range aviation fleet (ADA). The NA-40 attack bomber project was prepared according to the same terms of reference as the future A-20 and together with it participated in the 1938 competition. Although the first flight specimen of the NA-40-2 crashed during testing, the flight data shown to it was a good claim for the future. After redesigning the design in accordance with the wishes of the military, the company gave it a new index - NA-62. On the eve of the war, the customers were in such a hurry that they took the aircraft into service even before the prototype was built, immediately ordering 184 aircraft as medium bombers, assigning them the designation B-25 "Mitchell". On August 19, 1940, the first B-25 began flight tests. The B-25 surpassed the A-20 in size and had a crew of six - two pilots, a navigator, a bombardier, a flight mechanic and a tail gunner. The bomber was configured according to the scheme of a cantilever twin-engine monoplane with staggered tail. Everything was in the latest fashion - an all-metal structure with a working skin, a chassis with a nose strut, powerful 1350 hp Wright R-2600-A58 motors. with. with propellers - machine guns, anti-icing system, strong defensive weapons. In 1941, the B-25A began to enter service with the American army aviation. When the Great Patriotic War began and President Roosevelt announced assistance to the Soviet Union, the B-25 was also among the types of aircraft offered to us. A group of pilots led by M.M. Gromov, who originally arrived in the United States to receive heavy bombers B-17 "Flying Fortress" ("Flying Fortress"), took up the development of unfamiliar technology. Familiarization with the machines and their equipment took place at the air bases in Spokane and Patterson. Our crews were given the opportunity to thoroughly study the B-25A, fly them and even conduct training battles with P-43 fighters. The guests were received by Captain E. York, who spoke Russian. The American historian E. McDowell writes in his book that "the Russians flew the B-25 like a fighter." As a result, rivets popped out of the Mitchell's wings, several shooters damaged the ribs, and one P-43 crashed into the ground. According to Gromov, the crew of the B-25A was unreasonably large for a front-line bomber. He also rated the aircraft's armor and armament as inadequate. On September 16, at Bollingfield airbase, Gromov was shown an improved B-25B, featuring enhanced defensive armament (upper and lower turrets with a pair of large-caliber machine guns), and with it another machine of the same purpose - Martin B-26. A few days later, the Soviet embassy announced a desire to receive three B-26s and two B-25Bs, but on October 1, the decision was changed in favor of five B-25Bs. "Mitchell" had one important advantage over the B-26 "Marauder" - it was much easier to fly, although slightly inferior in flight performance. The application was accepted, but there was a delay due to the demand of the Soviet side to put anti-icers on the aircraft, which was not initially specified. On November 6, 1941, the first two B-25Bs were loaded onto the Soviet steamship "Decembrist", which, with one of the convoys, headed to its native shores. On December 20, the Dekabrist moored in the Murmansk port. In January, fellow bombers, but had to wait until a spare wheel was delivered to one of the Mitchells to replace the one damaged on the road. Only on March 5, both planes flew to Moscow. None of the B-25Bs were used as a combat vehicle. They all served for educational purposes. One ended up in the 11th reserve regiment in Kirovabad, three - in the 6th reserve brigade in Ivanovo. One of the five bomber subsequently visited the United States again: it became the personal aircraft of I.P. Mazuruka and in September 1942 arrived in Fairbanks at the head of a group of passenger PS-84, which delivered Soviet ferry pilots there. To the combat units of the Soviet Air Force; The Mitchells hit only after the opening of the Persian Corridor, which was considered a safer route for the supply of equipment through Iran. Led by civilian Pan American crews, the planes flew from the United States through Brazil, the Atlantic Ocean, Africa and the Middle East. The first 72 B-25Cs (this was an improved modification with new R-2600-13 engines and a number of minor changes) arrived in Iran in March 1942. By the end of the year, 102 B-25s were transported to the USSR by this route, and a total of 118 of these vehicles were delivered through Iran. In April 1942, the first three (according to other sources, four) B-25S were transferred to the 37th bomber regiment of Lieutenant Colonel Katarzhin. This part was transferred from the Far East to the Monino airfield near Moscow. Experts from the Air Force Research Institute (who drove the cars from Basra) and the TsAGI Bureau of New Technology helped to study the new technology. One plane was dismantled for better acquaintance. Some members of Gromov's group, who studied the B-25 in the United States, were transferred to the regiment - pilots, navigators, engineers. TsAGI had its own interest in the study of the machine - "Mitchell" clearly demonstrated the achievements of American aircraft technology. Detailed descriptions of the B-25 were compiled. analyzed all the main structural elements. The American bomber had a lot to learn - in particular, its adaptability to large-scale production. The TsAGI report says: "... the breakdown scheme provides a wide scope of work and, obviously, has the main goal of ensuring mass production." In June 1942, one B-25S passed the full program of state tests at the Air Force Research Institute, receiving very good reviews. The bombers that arrived in Monino underwent a re-equipment, since the Americans had a separate bombardier (in the bow cockpit) and a separate navigator, who was sitting behind the nilots, in the crew. For us both functions were combined by the navigator and for him all navigation instruments were transferred to the bow. The outdated Vimperis bombsight that comes with it! export B-25s were removed from us, replacing them with domestic OPB-1. To increase the combat survivability, a system of pressurizing the tanks with neutral gas was introduced. The alteration of the machines was carried out by the plant number 156 and the Air Force re-base in Monino. By the end of the spring of 1942, three regiments (37th, 125th and 16th) were re-equipped with the Mitchells as part of the 222nd Division, which, in turn, entered the General's 1st Army Sudtsa. After the disbandment of this army, the division was sent to the Western Front. The 37th regiment began to fight in July, and the 16th in August. from September - 125th. The bombers operated near Vyazma, Dorogobuzh, Yartsevo. There were many daily sorties by single aircraft and small groups without fighter cover. The targets were automobile and tank columns, fortified positions. Almost immediately, a strange defect emerged - the "decay" of the aircraft's soft gas tanks. It turned out that Soviet gasoline 4B-78, rich in impurities of aromatic hydrocarbons, quickly destroys the inner layers of rubber. Already on October 5, by order of the chief engineer of the Air Force, the B-25 was transferred to imported B-100 gasoline. Most of this fuel came from the United States in cans and the ground train was tormented by pouring the contents of the cans into petrol tankers. But the corrosion of the tanks stopped. The Mitchells did not work for long in the front-line aviation. At low altitudes, the rather bulky B-25 behaved inertly and presented a good target for German anti-aircraft gunners. The losses began to grow. As a result, they came to the conclusion that the use of the B-25 for tactical purposes is ineffective. On September 29, 1942, the 222nd Division was officially transferred to Long-Range Aviation (ADD). This use of these aircraft on the Soviet-German front was quite logical. For the role of a front-line bomber, the Pe-2 and A-20 were much better suited to us, and in the ADD it was possible to fully use the large range of the B-25, and excellent navigation radio equipment, and powerful weapons, and a significant bomb load. In all these characteristics, it was more in line with the long-range Il-4 than our front-line bombers. In some respects - in speed, defensive armament, equipment - the B-25 was superior to the Il-4, but in some ways it was inferior to it. "Mitchells" began to make long-distance night raids behind enemy lines. On November 18, there were 68 B-25s in the fleet of the 222nd division. To increase the range, specially designed horseshoe-shaped additional gas tanks were installed in the bomb bay. These tanks were used for maximum range flights. At the same time, the bombs were placed on an external sling under the wing (usually two FAB-250 were taken). Then, at the plant No. 156, they mastered the production of cardboard disposable hanging tanks. For bombing at night, the NKPB-7 sights were mounted on the planes. In the fall of 1942, with the first frost, we faced massive failures of units, instruments, weapons. The reason was the non-frost resistance of the hydraulic hoses. There are oil cooler ruptures. But these problems were dealt with fairly quickly. Subsequently, all aircraft arriving from the United States were trained for winter operation. Provided for a complete drain of gasoline and oil. The cars were equipped with winter lubricants and hydraulic mixture. The bombers were equipped with special winter gaskets, hoses, and studded wheel covers. In general, the B-25 was well adapted to the cold: it had a system for diluting oil with gasoline, wells for quickly heating oil tanks, heating cabins and weapons, blowing warm air over the cockpit windows, pneumatic anti-icers on the wing and tail, washing the propeller blades with alcohol. Since the end of 1942, most of the bombers came from America via ALSIB. On October 28, at the Laddfield base, the first training flight of the Soviet crew on the B-25C took place, and on November 3, Captain P.P. Gamov led the first plane to the west. Until the end of the year, Fairbanks received no more than a dozen Mitchells, but the following year, they went much more. The B-25C was followed by the B-25D. They were built by another plant in Kansas City, and from the very beginning they were equipped with an additional tank in the bomb bay and had underwing bomb racks. On the last series, B-25D-30 (we designated B-25DP), the lower outlet turret was abandoned. We rightly criticized it: limited visibility, jamming during a sharp release, the ability to use only after full extension. It was replaced by a pair of machine guns in the airborne installations. This scheme of defensive weapons was retained in later modifications. One of the B-25D-30s was tested at the Air Force Research Institute in June 1944. In 1943, American factories mastered another modification of the B-25J with enhanced armament. When installed in the front on the sides of the fuselage, additional machine-gun containers, it reached 11 barrels of 12.7 mm caliber. The crew increased by one person. True, we flew with a crew of five — the functions of navigator and bombardier were still combined. Although the model was equipped with more powerful R-2600-29 engines, the increase in weight (including due to the higher bomb load) reduced all the flight characteristics of the aircraft. Since 1944, the B-25J and ours began to gradually replace the B-25C and B-25D. |
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