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Ilyushin DB-3

The Ilyushin DB-3 was a twin-engine, all-metal developed by the Soviet Union's design bureau in the mid-1930s, serving as a key long-range tactical aircraft for the Soviet Air Force (VVS) and during . Originating from the TsKB-26 prototype that first flew in 1935, it entered production in 1937 with approximately 1,528 units built before evolving into the improved DB-3F variant (later redesignated Il-4) in 1939, which added enhanced aerodynamics, armament, and performance for a total production run exceeding 6,700 aircraft across variants. Development of the DB-3 began under Sergei Ilyushin's team to meet the VVS requirement for a versatile capable of high-speed, long-range operations, building on earlier prototypes like the TsKB-30 and incorporating a low-wing with retractable and radial engines. The featured a crew of three to four, powered initially by two M-85 radial engines (595 kW each) and later upgraded to more powerful M-88 variants (up to 820 kW), enabling a maximum speed of around 430 km/h at 6,500 meters, a service ceiling of 9,700 meters, and a ferry range of up to 3,800 km with auxiliary fuel tanks. Armament typically included three 7.62 mm ShKAS machine guns for defense, with the DB-3F/Il-4 upgrading to a 12.7 mm Berezin UBT in a turret, and a load capacity of up to 2,500 kg internally or externally, making it suitable for both daylight tactical strikes and nighttime raids. Notable variants included the DB-3T introduced in 1938, which adapted the for naval roles with under- pylons for 45-36-AN torpedoes (up to 935 kg) or mines, achieving speeds of 395 km/h and a range of 1,800 km while serving in Baltic and squadrons for anti-shipping and mining operations from 1939 to 1945. The experimental DB-3TP version, tested in 1938 with Short-type floats for shore-based maritime patrols, did not enter production due to issues. The DB-3F/Il-4, with its streamlined "cigar-shaped" and wooden rear options for wartime material shortages, became the most produced iteration starting in 1940, totaling 5,256 units by 1945. In combat, the DB-3 proved resilient despite its obsolescence by mid-war standards, participating in early Soviet offensives during the against in 1939–1940 and the German invasion in 1941, where it conducted daring long-range bombing raids on on August 7–8, 1941, using modified aircraft with extra fuel to fly 2,000 km round trips from bases near . It also targeted oil facilities at , , and supported ground forces on the Eastern Front, with naval DB-3T units contributing to operations; post-war, surplus Il-4s were exported to allies like and used by and for evaluation. The type's endurance was highlighted by record-setting non-stop flights in 1938–1939, covering over 8,000 km, underscoring its role in advancing Soviet aviation capabilities before and during the Great Patriotic War.

Design and development

Origins and prototypes

In the mid-1930s, the Soviet Air Forces issued a requirement for a new twin-engine long-range bomber designated BB-2, prompting Sergey Ilyushin, chief of the Central Design Bureau (TsKB) at TsAGI, and his team of engineers to initiate development of an advanced monoplane design emphasizing speed, range, and aerodynamic efficiency. This effort built on lessons from earlier bombers like the Tupolev TB-3, aiming for a more refined aircraft with retractable landing gear and streamlined features to meet the demands of strategic bombing. The initial proof-of-concept prototype, TsKB-26, featured a mixed with a wooden and metal wings, powered by two M-85 radial engines each producing approximately 800 . It made its in July , piloted by Kokkinaki, and demonstrated promising performance during early trials, including good maneuverability and single-engine handling characteristics, though it lacked full armament for experimental purposes. The TsKB-26 set several world records for altitude, speed, and range with payload in and , validating key design elements but highlighting needs for improved structural strength and engine reliability. Building on these results, Ilyushin's team developed the all-metal TsKB-30 prototype, which incorporated a longer , enclosed , retractable , and enhanced for better long-range capabilities. Rolled out in March 1936 and first flown on March 31, 1936, also by Kokkinaki, the TsKB-30 underwent rigorous state trials that confirmed its superior qualities, achieving a maximum speed of 444 km/h and a of 4,000 km during evaluations. Iterative modifications addressed initial concerns with engine cooling and airframe integrity, leading to official acceptance as the DB-3 bomber in August 1936.

Production and nomenclature

The Ilyushin DB-3 entered serial production in 1937 at Factory No. 39 in and Factory No. 18 in , with an additional line established at Factory No. 126 in in 1938 to boost output. Approximately 1,528 units of the early DB-3 variants were completed by 1940, after which production transitioned toward the improved DB-3F from late 1939 onward (later redesignated Il-4 in 1942), contributing to a total series output exceeding 5,000 aircraft. The "DB" in the aircraft's designation stood for Dalniy Bombardirovshchik (Russian: Дальний бомбардировщик), translating to "long-range bomber," which set it apart from shorter-range tactical bombers like the Tupolev SB (Sredniy Bombardirovshchik, or medium bomber). This nomenclature reflected the Soviet Air Force's emphasis on strategic reach in its bomber fleet during the late 1930s. Early DB-3 models were equipped with Mikulin M-85 radial engines rated at 800 hp each, but production of the DB-3B variant from 1938 incorporated more powerful M-87A engines delivering 950 hp, along with variable-pitch propellers; these upgrades enhanced maximum speed to approximately 440 km/h and extended range to 3,800 km with a standard bomb load. Production encountered significant hurdles, including material shortages and stringent quality controls that mandated X-ray inspections of welds, often leading to rejections and delays; wartime evacuation of facilities further complicated assembly in unheated, disorganized environments. By 1941, around 1,000 DB-3, DB-3A, and DB-3B aircraft had been delivered, after which focus shifted to the DB-3F/Il-4 for continued wartime needs.

Technical characteristics

Airframe and engines

The Ilyushin DB-3 was an all-metal low-wing with a constructed primarily from riveted sheets and , providing a streamlined structure optimized for long-range flight. The measured 14.22 meters in length and accommodated a of three: a pilot, a /bombardier, and a rear . The wings featured a of 21.44 meters and an area of 65.6 square meters, with fabric-covered ailerons and flaps for control surfaces; the main was retractable into the engine nacelles, while the tailwheel remained fixed. This configuration emphasized structural integrity and ease of while supporting the aircraft's emphasis on over agility. The DB-3 was powered by two air-cooled radial engines, typically the in production models, each producing 950 horsepower at takeoff and equipped with three-bladed variable-pitch propellers for improved efficiency at varying altitudes. Earlier variants used the or engines with around 750-800 horsepower, but the upgrade enhanced reliability and power output. Fuel was stored in wing tanks with a standard capacity of approximately 3,600 liters, supplemented by optional auxiliary tanks of up to 800 liters, enabling a maximum range of 3,800 kilometers with a 1,000 kg bomb load. Basic performance metrics reflected the design's focus on long-range capability: the aircraft achieved a maximum speed of 439 km/h at 4,900 meters, a service ceiling of 9,600 meters, and a climb rate of approximately 6.9 m/s. Empty weight was 5,030 kg, with a of 9,450 kg. Compared to contemporaries, the DB-3 offered superior range to the (approximately 2,300 km), though its speed lagged behind the (up to 510 km/h), underscoring Soviet priorities for strategic reach in medium bomber operations.

Armament and performance

The Ilyushin DB-3 was equipped with a modest defensive armament consisting of three 7.62 mm ShKAS machine guns, positioned one in the nose glazing, one in a turret, and one in a ventral hatch, providing coverage against pursuing fighters from multiple angles. Each was supplied with 500 to 1,000 rounds of ammunition depending on the mission configuration. This setup offered limited firepower compared to contemporary bombers, prioritizing weight savings for range over heavy gunnery. Offensively, the DB-3 relied on its internal , which could accommodate up to 1,000 kg of in standard configuration, such as ten 100 kg high-explosive bombs, while overload capacity allowed for a maximum of 2,500 kg using external underwing racks for additional 500 kg or 1,000 kg bombs. The DB-3T variant adapted this for roles, replacing bombs with a single 45-36-AN or 45-36-AV weighing approximately 935 kg and measuring 5.7 meters in length, mounted on centerline shackles; these 450 diameter weapons carried a 200 kg and were effective for anti-shipping strikes. Alternatively, the DB-3T could deploy naval mines up to 900 kg, such as the AMG-1, enhancing its versatility in coastal and fleet interdiction tasks. The armament configuration significantly influenced the DB-3's overall performance, as the added weight of 500 to 800 kg from full or loads reduced its maximum range by approximately 20 percent, limiting effective operational radius to around 3,000 km under combat conditions. Cruising speed dropped to about 400 km/h when fully loaded, compared to a clean maximum of 445 km/h at higher altitudes, compelling pilots to fly at lower profiles for drops—typically 30 to 100 meters above the sea at 320 km/h—to ensure accuracy against moving ships. Without onboard , bombing and runs depended entirely on visual sighting, further emphasizing the need for clear and low-altitude endurance, which the DB-3 achieved through 6 to 8 hours of loiter time suitable for . These trade-offs made the effective for long-range strikes but vulnerable during payload delivery.

Operational history

Pre-war deployments

The Ilyushin DB-3 entered service with the Soviet Air Force's Long-Range Bomber Aviation (DBAP) in spring 1937, following successful state trials of pre-production aircraft conducted from May to October 1937 at the Scientific Research Institute of the Air Force (NIl WS). These trials demonstrated superior speed and range compared to contemporary German bombers like the Ju 86D and He 111B, achieving 201 mph (323 km/h) at sea level, a time to 16,400 feet (5,000 m) of 10.7 minutes, and a service ceiling of 30,500 feet (9,300 m). In the late , DB-3 units participated in major Soviet maneuvers, showcasing their long-range capabilities in simulated operations, while also supporting the development of through tests of the DB-3TP variant in summer 1938. The aircraft's endurance was further proven in demonstration flights, including a notable 7,580 km non-stop journey from to Spassk-Dalny in the Soviet Far East in 1938, which highlighted its potential for extended operations in remote areas such as the Arctic regions. In 1939, the exported 24 DB-3 bombers to the to bolster its during the , with the first group of 12 arriving in summer under G. A. Kulishenko's command and the second group following shortly after. Based at Chengdu's Taipingsi , these conducted long-range bombing missions against Japanese positions, including attacks on Hankou on October 3 and 14, 1939, which destroyed several enemy planes, as well as leaflet drops over in October 1940. Several were lost to Japanese fighters and accidents, with at least three damaged during the October 14 raid and additional attrition reported in subsequent operations through 1940. During the Winter War against Finland (1939–1940), DB-3 bombers were deployed for strategic strikes, including eight raids on that dropped approximately 350 bombs and caused 97 civilian deaths, with one notable mission on November 30, 1939, involving 17 aircraft flying from Estonia across the . A notable incident occurred on January 6, 1940, when Finnish ace Jorma Sarvanto downed six DB-3s in one mission using a fighter. Over 50 sorties were recorded in these operations, but the DB-3 suffered high attrition—around 20% of deployed aircraft—due to harsh winter weather, anti-aircraft fire, and Finnish interceptors, resulting in at least five captures by Finnish forces. Prior to the main Eastern Front engagements, DB-3 units saw limited action in the 1939 border clashes at against Japanese forces, where a number of bombers from converting heavy regiments targeted Japanese bases and troop concentrations, helping shape Soviet tactical doctrines for future conflicts. By , production had ramped up significantly, with over 1,500 DB-3 units manufactured across factories in , , and , forming the backbone of Soviet capabilities with more than 500 aircraft operational in DBAP regiments.

World War II service

The Ilyushin DB-3 played a significant role in the early phases of , the German invasion of the launched on June 22, 1941, where squadrons conducted strikes against advancing German armored columns and supply lines. However, lacking adequate fighter escorts and facing overwhelming superiority, the bombers incurred severe attrition; for instance, on June 26, 1941, 43 DB-3Fs failed to return from missions due to poor coordination and enemy interception. Overall, Soviet long-range aviation, heavily reliant on the DB-3, lost hundreds of aircraft in the first weeks, with estimates exceeding 300 DB-3 variants destroyed on the ground and in air combat amid the rapid German advances. In response to Luftwaffe raids on Moscow, Soviet naval aviation executed symbolic long-range strikes on Berlin starting August 7, 1941, using DB-3 variants from the Baltic Fleet's 1st Mine-Torpedo Aviation Regiment based on Saarema Island. On the first mission, 10 DB-3 bombers departed, with three reaching the target and dropping approximately 500 kg of high-explosive bombs on the Siemensstadt industrial district from altitudes around 6,500 meters, while also scattering propaganda leaflets; all returned safely despite flak and night fighters. Subsequent raids on August 8 and 10 involved additional DB-3Fs, including five aircraft that bombed Berlin proper, delivering a total of 468 kg of ordnance from 7,000 meters and providing a crucial morale boost to Soviet forces under pressure. These operations, though limited in material damage, shocked Nazi leadership and demonstrated the DB-3's range capabilities. The DB-3T torpedo variant proved vital in anti-shipping campaigns across the and Seas, targeting Axis convoys and naval assets from 1941 onward. Operating from forward bases, DB-3T squadrons conducted low-level torpedo drops and mine-laying missions against German transports and escorts; between July and September 1941, crews struck ports like and Danzig, while units hit oil facilities and shipping lanes, contributing to the disruption of logistics despite high exposure to fighters and flak. Notable successes included sinkings of several merchant vessels and damage to U-boat tenders in 1942-1943 operations, though specific attributions like partial roles in major incidents remain debated amid overall losses. By mid-1943, the DB-3 was largely supplanted by the improved Il-4 for front-line duties, shifting to , , and supply drops for groups behind enemy lines. Throughout the war, over 1,000 DB-3 airframes were lost in combat on the Eastern Front, reflecting the aircraft's extensive but costly employment.

Variants and operators

Major variants

The Ilyushin DB-3 entered production in as a twin-engine long-range powered by two M-85 radial engines, with initial output contributing to a total of approximately 1,528 units built by 1940 serving as the foundational model for Soviet long-range . This initial variant featured an all-metal with retractable and was designed for missions, marking a significant advancement over earlier Soviet bombers like the TB-3. In 1937, the DB-3A variant was developed to address cooling and power issues of the original, incorporating upgraded M-86 radial engines rated at 850 horsepower each, along with minor aerodynamic refinements for better high-altitude performance; a limited number were produced. These changes improved engine reliability during takeoff and climb, making the DB-3A a transitional model before more substantial redesigns. The DB-3B, produced from 1938 to 1941, became the most numerous and standardized version for operations, equipped with M-87A radial engines and featuring an enclosed cockpit for enhanced crew protection against the elements; the majority of the DB-3 series were of this type, forming the backbone of Soviet fleets during the early war years. Key modifications included variable-pitch propellers for optimized thrust and slight structural reinforcements to carry heavier defensive armament loads. To meet needs, the , introduced in , was adapted from the DB-3 with a ventral hatch to accommodate torpedoes or equipment; approximately 60 units were produced primarily for Soviet . The DB-3T focused on anti-shipping strikes using 45-36 series torpedoes, while the experimental DB-3TP , tested in with Short-type floats for shore-based patrols, did not enter production due to issues. The DB-3F, developed in 1939 and entering production in 1940 (later redesignated Il-4 in 1942 and sometimes referred to as DB-3M), represented a major redesign incorporating M-88 radial engines for greater power and efficiency, with a total production of 5,256 units through 1945. This evolution included a more streamlined and increased area to boost range and , effectively bridging the DB-3 series to its postwar successor.

Military operators

The Ilyushin DB-3 served primarily as the backbone of the ' (VVS) long-range bombing capability, operated extensively by the Long-Range Aviation (ADD) branch and (V-MF). By June 1941, the VVS had 1,122 DB-3 and DB-3F aircraft in ADD regiments, with 906 combat-ready, representing a peak inventory before heavy losses in the early stages of reduced operational numbers to around 75 by July 1941. These aircraft were assigned to various long-range corps and later integrated into the 18th Air Army by December 1944, conducting , reconnaissance, and transport missions throughout . The accounted for the vast majority of DB-3 operations, comprising approximately 95% of all sorties flown by the type across all users. The received 24 DB-3 bombers from the in 1939 as part of aid during the Second Sino-Japanese War, forming the core of the 8th Bomber Air Group based in and supported by Soviet volunteer pilots. These aircraft, often referred to in Chinese service as the 2nd Bomber Squadron, conducted long-range raids against Japanese targets, including notable strikes on airfield over 1,500 km away, until operations ceased by late 1943 due to attrition, lack of spares, and transition to U.S. equipment. Finland became a secondary operator through captures and acquisitions during and after the . The captured five DB-3s that force-landed during 1939–1940 hostilities, later redesignated as DA-3, and in 1941 purchased an additional six from German war surplus stocks, bringing the total to 11 aircraft. These were employed for and light bombing roles until 1944–1945, primarily in the against the . Germany's captured a small number of DB-3s, estimated at 2–3, during the 1941 invasion of the , using them for evaluation and testing under codes such as DF+23. Some of these captured examples were subsequently transferred to allies like , but operational use by the remained limited to non-combat roles.

Legacy

Records and achievements

The TsKB-30 prototype, a modified precursor to the DB-3, achieved a notable endurance record with a non-stop from to Miscou Island in , , covering approximately 8,000 km in 22 hours and 56 minutes on April 28-29, 1939, piloted by Vladimir Kokkinaki and Mikhail Gordienko. This flight, conducted under challenging weather conditions with an average speed of 348 km/h, demonstrated the aircraft's exceptional range capabilities and attracted international attention to Soviet aviation prowess. In 1938 trials, the DB-3B variant reached a maximum speed of 439 km/h, surpassing initial design specifications and highlighting advancements in Soviet aerodynamics. This performance influenced the development of long-range strike doctrines, emphasizing the DB-3's potential for deep penetration missions beyond frontline combat. The DB-3 represented a key engineering milestone as the Soviet Union's first all-metal equipped with retractable and thin-section wings, enabling improved speed and efficiency over earlier fabric-covered designs. These innovations laid the groundwork for the refined DB-3F (later redesignated Il-4), which incorporated a streamlined and more powerful engines for enhanced operational versatility. In recognition of these contributions, designer Sergei Ilyushin and his team received the Stalin Prize in 1941 for their work on the series. Symbolically, DB-3 aircraft from the conducted the first on August 8, 1941, dropping ordnance on the German capital in retaliation for the invasion of the USSR, which served as a significant victory by demonstrating Soviet reach and resolve early in the war.

Survivors and preservation

The sole known surviving Ilyushin DB-3 is a DB-3M variant with serial number 891311, currently on display at the in Monino, near , . This aircraft, the only intact example from approximately 1,500 produced, was recovered in September 1988 from taiga forests about 120 km from , where it had crashed during a training flight in 1941. After over a year of restoration at the Irkutsk Aircraft Industrial Association, it was transported by and delivered to the museum in December 1988. The airframe remains partially intact, including its original Mikulin AM-87 radial engines, though some components were reconstructed during restoration. It is exhibited in the markings "White 12," representative of Soviet long-range bomber squadrons active in 1941, including those that conducted raids on . The museum, which houses over 170 aircraft, continues to maintain the DB-3 as a centerpiece of its collection, with no relocation occurring despite 2019 plans to disperse parts of the exhibit. Beyond this survivor, DB-3 relics consist primarily of wreckage from crash sites in and , recovered during post-war searches and recent archaeological efforts. Notable examples include fragments excavated near , , in 2017, revealing pilot remains and personal items, and a 1944 crash site at Hovinmaa, , where structural parts were documented. Some components from these sites have entered private collections, but no other complete airframes exist, and none are in airworthy condition. Preservation of the Monino DB-3 faces ongoing challenges from due to prolonged exposure in harsh conditions before recovery and wartime storage. In the , broader heritage initiatives have incorporated digital 3D scanning for rare Soviet to create virtual models, aiding long-term conservation and public access, though no specific post-2020 projects for this airframe have been announced. The exhibit symbolizes Soviet resilience in displays, underscoring the DB-3's role in early long-range operations, with no reports of additional finds since 2020.

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