Heavy bombers are bomber aircraft capable of delivering the largest payload of air-to-ground weaponry (usually bombs) and longest range of their era. Archetypal heavy bombers have therefore usually been among the largest and most powerful military aircraft at any point in time. In the second half of the 20th century, heavy bombers were largely superseded by strategic bombers, which were often smaller in size, but were capable of delivering nuclear weapons.
Because of advances in aircraft design and engineering — especially in powerplants and aerodynamics — the size of payloads carried by heavy bombers have increased at rates greater than increases in the size of their airframes. The largest bombers of World War I, the four engine aircraft built by the Zeppelin-Staaken company in Germany, could carry a payload of up to 4,400 pounds (2,000 kg) of bombs. By the middle of World War II even a single-engine fighter-bomber could carry a 2,000-pound (910 kg) bomb load, and such aircraft were taking over from light and medium bombers in the tactical bombing role. Advancements in four-engine aircraft design enabled heavy bombers to carry even larger payloads to targets thousands of kilometres away. For instance, the Avro Lancaster (introduced in 1942) routinely delivered payloads of 14,000 pounds (6,400 kg) (and sometimes up to 22,000 lb/10,000 kg) and had a range of 2,530 miles (4,070 km). The B-29 (1944) delivered payloads in excess of 20,000 pounds (9,100 kg) and had a range of 3,250 miles (5,230 km). By the early 1960s, the jet-powered Boeing B-52 Stratofortress, travelling at speeds of up to 650 miles per hour (1,050 km/h) (i.e., more than double that of a Lancaster), could deliver a payload of 70,000 pounds (32,000 kg), over a combat radius of 4,480 miles (7,210 km).
During World War II, mass production techniques made available large, long-range heavy bombers in such quantities as to allow strategic bombing campaigns to be developed and employed. This culminated in August 1945, when B-29s of the United States Army Air Forces dropped atomic bombs over Hiroshima and Nagasaki in Japan, contributing significantly to the end of hostilities.
The arrival of nuclear weapons and guided missiles permanently changed the nature of military aviation and strategy. After the 1950s intercontinental ballistic missiles and ballistic missile submarines began to supersede heavy bombers in the strategic nuclear role. Along with the emergence of more accurate precision-guided munitions ("smart bombs") and nuclear-armed missiles, which could be carried and delivered by smaller aircraft, these technological advancements eclipsed the heavy bomber's once-central role in strategic warfare by the late 20th century. Heavy bombers have, nevertheless, been used to deliver conventional weapons in several regional conflicts since World War II (e.g., B-52s in the Vietnam War).
Heavy bombers are now operated only by the air forces of the United States, Russia and China. They serve in both strategic and tactical bombing roles.
The first heavy bomber was designed as an airliner. Igor Sikorsky, an engineer educated in St Petersburg, but born in Kiev of Polish-Russian ancestry designed the Sikorsky Ilya Muromets to fly between his birthplace and his new home. It did so briefly until August 1914, when the Russo-Balt wagon factory converted to a bomber version, with British Sunbeam Crusader V8 engines in place of the German ones in the passenger plane. By December 1914 a squadron of 10 was bombing German positions on the Eastern Front and by summer 1916 there were twenty. It was well-armed with nine machine guns, including a tail gun and initially was immune to German and Austro-Hungarian air attack. The Sikorsky bomber had a wingspan just a few feet shorter than, with a bomb load only 3% of, a World War II Avro Lancaster.
The Handley Page Type O/100 owed a lot to Sikorsky's ideas; of similar size, it used just two Rolls-Royce Eagle engines and could carry up to 2,000 lb (910 kg) of bombs. The O/100 was designed at the beginning of the war for the Royal Navy specifically to sink the German High Seas Fleet in Kiel: the Navy called for “a bloody paralyser of an aircraft” Entering service in late 1916 and based near Dunkirk in France, it was used for daylight raids on naval targets, damaging a German destroyer. But after one was lost, the O/100 switched to night attacks.
The uprated Handley Page Type O/400 could carry a 1,650 lb (750 kg) bomb, and wings of up to 40 were used by the newly formed, independent Royal Air Force from April 1918 to make strategic raids on German railway and industrial targets. A single O/400 was used to support T. E. Lawrence's Sinai and Palestine Campaign.
The Imperial German Air Service operated the Gotha bomber, which developed a series of marques. The Gotha G.IV operated from occupied Belgium from the Spring of 1917. It mounted several raids on London beginning in May 1917. Some reached no further than Folkestone or Sheerness on the Kent Coast. But on June 13, Gothas killed 162 civilians, including 18 children in a primary school, and injured 432 in East London. Initially defence against air attack was poor, but by May 19, 1918, when 38 Gothas attacked London, six were shot down and another crashed on landing.
German aircraft companies also built a number of giant bombers, collectively known as the Riesenflugzeug. Most were produced in very small numbers from 1917 onwards and several never entered service. The most numerous were the Zeppelin-Staaken R.VI of which 13 saw service, bombing Russia and London: four were shot down and six lost on landing. The R.VIs were larger than the standard Luftwaffe bombers of World War II.
The Vickers Vimy, a long-range heavy bomber powered by two Rolls-Royce Eagle engines, was delivered to the newly formed Royal Air Force too late to see action (only one was in France at time of the Armistice with Germany). The Vimy's intended use was to bomb industrial and railway targets in western Germany, which it could reach with its range of 900 miles (1,400 km) and a bomb load of just over a ton. The Vickers Vimy is best known as the aircraft that made the first Atlantic crossing from St John's Newfoundland to Clifden in Ireland piloted by the Englishman John Alcock and navigated by Scot Arthur Whitten Brown on June 14, 1919.
Between the wars, aviation opinion fixed on two tenets. The first was that “the bomber will always get through.” The speed advantage of biplane fighters over bombers was insignificant, and it was believed that they would never catch them. Furthermore, there was no effective method of detecting incoming bombers at sufficiently long range to scramble fighters on an interception course. In practice, a combination of new radar technology and advances in monoplane fighter design eroded this disadvantage. Throughout the war, bombers continually managed to strike their targets, but suffered unacceptable losses in the absence of careful planning and escort fighters. Only the later de Havilland Mosquito light bomber was fast enough to evade fighters. Heavy bombers needed defensive armament for protection, which reduced their effective bomb payload.
The second tenet was that strategic bombing of industrial capacity, power generation, oil refineries, and coal mines could win a war. This was certainly vindicated by the firebombing of Japanese cities and the two atomic bombs dropped on Hiroshima and Nagasaki in August 1945, as Japan's fragile housing and cottage industry made themselves easily vulnerable to attack, thus completely destroying Japanese industrial production (see Air Raids on Japan). It was less evident that it held true for the bombing of Germany. During the war, German industrial production actually increased, despite a sustained Allied bombing campaign.
As the German Luftwaffe's main task was to support the army, it never developed a successful heavy bomber. The prime proponent of strategic bombing, Luftwaffe Chief of Staff General Walther Wever, died in an air crash in 1936 on the very day that the specification for the Ural bomber (later won by the Heinkel He 177 which saw only limited use against the Soviet Union and England) was published. After Wever's death, Ernst Udet, development director at the Air Ministry steered the Luftwaffe towards dive bombers instead.
When Britain and France declared war on Germany in September 1939, the RAF had no heavy bomber. The Handley Page Halifax and Avro Lancaster both originated as twin engine bombers, but were rapidly redesigned for four Rolls-Royce Merlin engines and rushed into service once the technical problems of the larger Rolls-Royce Vulture emerged. The Halifax joined squadrons in November 1940 and flew its first raid against Le Havre on the night of 11–12 March 1941. British heavy bomber designs often had three gun turrets with a total of 8 machine guns. In January 1941, the Short Stirling reached squadrons. It was based on the successful Short Sunderland flying boat and shared its Bristol Hercules radial engines, wing, cockpit and upper fuselage. The hull of the flying boat was replaced by a lower fuselage. It carried up to 14,000 lb (6,400 kg) of bombs — almost twice the load of a Boeing B-17 Flying Fortress — but over just a 300-mile (480 km) radius. Due to its thick, short wing it was able to out-turn the main German night fighters, the Messerschmitt Bf 110 and the Junkers Ju 88. Heavy bombers still needed defensive armament for protection, even at night. The Stirling's low operational ceiling of just 12,000 ft (3,700 m) — also caused by the thick wing — meant that it was usually picked on by night fighters; within five months, 67 of the 84 aircraft in service had been lost.
Due to the absence of British heavy bombers, 20 United States Army Air Corps Boeing B-17 Flying Fortresses were lent to the RAF, which during July 1941 commenced daylight attacks on warships and docks at Wilhelmshaven and Brest. These raids were complete failures. After eight aircraft were lost due to combat or breakdown and with many engine failures, the RAF stopped daylight bombing by September. It was clear that the B-17C model was not combat ready and that its five machine guns provided inadequate protection.
Combat feedback enabled Boeing engineers to improve the aircraft; when the first model B-17E began operating from English airfields in July 1942, it had many more defensive gun positions including a vitally important tail gunner. Eventually U.S. heavy bomber designs, optimized for formation flying, had 10 or more machine guns and/or cannons in both powered turrets and manually operated flexible mounts to deliver protective arcs of fire. These guns were located in tail turrets, side gun ports either just behind the bombardier's clear nose glazing as "cheek" positions, or midway along the rear fuselage sides as "waist" positions. U.S. bombers carried .50 caliber machine gun, and dorsal (spine/top of aircraft) and ventral (belly/bottom of aircraft) guns with powered turrets. All of these machine guns could defend against attack when beyond the range of fighter escort; eventually, a total of 13 machine guns were fitted in the B-17G model. In order to assemble these combat box formations, assembly ships were used, speeding up their assembly times.
Even this extra firepower, which increased empty weight by 20% and required more powerful versions of the Wright Cyclone engine, was insufficient to prevent serious losses in daylight. Escort fighters were needed but the RAF interceptors such as the Supermarine Spitfire had very limited endurance. An early raid on Rouen-Sotteville rail yards in Brittany on August 17, 1942, required four Spitfire squadrons outbound and five more for the return trip.
The USAAF chose to attack aircraft factories and component plants. On August 17, 1943, 230 Fortresses attacked a ball-bearing plant in Schweinfurt and again two months later, with 291 bombers, in the second raid on Schweinfurt. The works was severely damaged but at huge cost: 36 aircraft lost in the first raid, 77 in the second. Altogether 850 airmen were killed or captured; only 33 Fortresses returned from the October raid undamaged
With the arrival of North American P-51 Mustangs and the fitting of drop tanks to increase the range of the Republic P-47 Thunderbolt for the Big Week offensive, between February 20–25, 1944, bombers were escorted all the way to the target and back. Losses were reduced to 247 out of 3,500 sorties, still devastating but accepted at the time.
The B-24 and later version of the Fortress carried even more extensive defensive armament fitted into Sperry ball turrets. This was a superb defensive weapon that rotated a full 360 degrees horizontally with a 90-degree elevation. Its twin M2 Browning machine guns had an effective range of 1,000 yards (910 m). The Liberator was the result of a proposal to assemble Fortresses in Consolidated plants, with the company returning with its own design of a longer-range, faster and higher-flying aircraft that could carry an extra ton of bombs. Early orders were for France (delivered to the RAF after the fall of France) and Britain, already at war, with just a batch of 36 for the USAAF.
Neither the USAAF nor the RAF judged the initial design suitable for bombing and it was first used on a variety of VIP transport and maritime patrol missions. Its long range, however, persuaded the USAAF to send 177 Liberators from Benghazi in Libya to bomb the Romanian oilfields on August 1, 1943, in Operation Tidal Wave. Due to navigational errors and alerted German flak batteries and fighters, only half returned to base although a few landed safely at RAF bases in Cyprus and some in Turkey, where they were interned. Only 33 were undamaged. Damage to the refineries was soon repaired and oil production actually increased
By October 1942, a new Ford Motor Company plant at Willow Run Michigan was assembling Liberators. Production reached a rate of over one an hour in 1944 helping the B-24 to become the most produced US aircraft of all time. It became the standard heavy bomber in the Pacific and the only one used by the RAAF. The SAAF used Liberators to drop weapons and ammunition during the Warsaw Uprising in 1944.
The Avro Manchester was a twin engine bomber powered by the ambitious 24-cylinder Rolls-Royce Vulture, but was rapidly redesigned for four Rolls-Royce Merlin engines due to technical problems with the Vulture which caused the aircraft to be unreliable, under-powered and hastened its withdrawal from service. Reaching squadrons early in 1942, the redesigned bomber with four Merlin engines and longer wings was renamed Avro Lancaster; it could deliver a 14,000 lb (6,400 kg) load of bombs or up to 22,000 lb (10,000 kg) with special modifications. The Lancaster's bomb bay was undivided, so that bombs of extraordinary size and weight such as the 10-ton Grand Slam could be carried.
Barnes Wallis, deputy chief aircraft designer at Vickers, spent much time thinking about weapons that might shorten the war. He conceived his “Spherical Bomb, Surface Torpedo” after watching his daughter flip pebbles over water. Two versions of the 'bouncing bomb' were developed: the smaller Highball was to be used against ships and attracted essential British Admiralty funding for his project. A 1,280 lb (580 kg) flying torpedo, of which half was Torpex torpedo explosive, it was developed specifically to sink the Tirpitz which was moored in Trondheim fjord behind torpedo nets. Development delays in the 'bouncing bomb' meant that another Barnes Wallis invention, the 5-ton Tallboy was deployed instead; two Tallboys dropped by Avro Lancasters from 25,000 ft (7,600 m) altitude hit at near-supersonic speed and capsized the Tirpitz on November 12, 1944. Upkeep, the larger version of the bouncing bomb, was used to destroy the Mohne and Eder dams by Lancasters from the specially recruited and trained 617 Squadron, often known as the Dambusters, under Wing Commander Guy Gibson.
In March and April 1945, as the war in Europe was ending, Lancasters dropped Grand Slams and Tallboys on U-boat pens and railway viaducts across north Germany. At Bielefeld more than 100 yards (91 m) of railway viaduct was destroyed by Grand Slams creating an earthquake effect, which shook the foundations.
The Boeing B-29 Superfortress was a development of the Fortress, but a larger design with four Wright R-3350 Duplex-Cyclone engines of much greater power, enabling it to fly higher, faster, further and with a bigger bomb load. The mammoth new Wright radial engines were susceptible to overheating if anything malfunctioned, and technical problems with the powerplant seriously delayed the B-29's operational service debut. The aircraft had four remotely operated twin-gun turrets on its fuselage, controlled through an analog computer sighting system; the operator could use any of a trio of Perspex ball stations. Only the tail gunner manually controlled his gun turret station in the rear of the airplane.
B-29s were initially deployed to bases in India and China, from which they could reach Japan; but the logistics (including transport of fuel for the B-29 fleet over the Himalayan range) of flying from these remote, primitive airfields were complicated and costly. The island of Saipan in the Marianas was assaulted to provide Pacific air bases from which to bomb Japanese cities. Initial high-level, daylight bombing raids using high-explosive bombs on Japanese cities with their wood and paper houses produced disappointing results; the bombers were then switched to low-level, nighttime incendiary attacks for which they had not originally been designed (one variant, the B-29B was specially modified for low altitude night missions by removal of armament and other equipment). Japan burned furiously from the B-29 incendiary raids. On August 6, 1945, B-29 Enola Gay dropped an atomic bomb on Hiroshima. Three days later, B-29 Bockscar dropped another on Nagasaki. The war ended when Japan announced its surrender to the Allies on August 15, and the Japanese government subsequently signed the official instrument of surrender on September 2, 1945.
After World War II, the name strategic bomber came into use, for aircraft that could carry aircraft ordnances over long distances behind enemy lines. They were supplemented by smaller fighter-bombers with less range and lighter bomb load, for tactical strikes. Later these were called strike fighters, attack aircraft and multirole combat aircraft.
When North Korea attacked South Korea in 1950 the USAF responded with daylight bomber raids on supply lines through North Korea. B-29 Superfortresses flew from Japan on behalf of the United Nations. But the supply to North Korea's army from the Soviet Union was physically and politically out of reach. There were no worthwhile strategic targets in North Korea. The Soviet mentored Northern forces easily routed the South Korean army. The distance to North Korea was too great for fighter escorts based in Japan. So the B-29s flew alone. In November, Mikoyan-Gurevich MiG-15s flown by Soviet pilots started to intercept the US bombers, over North Korea. The MiG-15 was specifically designed to master US heavy bombers, with nuclear weapons. It could out-perform any fighter deployed by United Nations air forces until the capable F-86 Sabre was produced in greater numbers and brought to Korea. After 28 B-29s were lost, the bombers were restricted to night interdiction and concentrated on destroying supply routes, including the bridges over the Yalu river into China.
By the 1960s, manned heavy bombers could not match the intercontinental ballistic missile in the strategic nuclear role. More accurate precision-guided munitions ("smart bombs"), nuclear-armed missiles or bombs were able to be carried by smaller aircraft such as fighter-bombers and multirole fighters. Despite these technological innovations and new capabilities of other contemporary military aircraft, large strategic bombers such as the B-1, B-52 and B-2 have been retained for the role of carpet bombing in several conflicts. The most prolific example (in terms of total bomb tonnage) is the U.S. Air Force B-52 Stratofortress during the 1960s–early 1970s Vietnam War era, in Operation Menu, Operation Freedom Deal, and Operation Linebacker II. In 1987 the Soviet Tu-160 — the heaviest supersonic bomber/aircraft ever built — entered service; it can carry twelve long-range cruise missiles.
The 2010 New START agreement between the United States of America and the Russian Federation defined a "heavy bomber" by two characteristics:
The 22nd Guards Donbass Red Banner Heavy Bomber Aviation Division was a Soviet Air Forces formation. It was a Long Range Aviation division active from 1942 to 2008-9. Included in the 37th Air Army High Command. Commander of the division was Major General Alexander Blazhenko. It saw illustrious service during the Second World War, including supply of the Red Army in the Demyansk Pocket and the bombing of Berlin.326th Heavy Bomber Aviation Division
326th Tarnopolsky Order of Kutuzov Heavy Bomber Air Division (326 TBAD) was an Aviation Division of the Long Range Aviation of Russia. Most recently it was included in the 37th Air Army of the Supreme High Command. It was originally formed as the 326th Night Bomber Aviation Division, formed at Yegoryevsk in Moscow Oblast on 10 October 1943. On 23 June 1944, it was renamed the 326th Bomber Aviation Division.98th Operations Group
The 98th Operations Group is a component unit of the Nevada Test and Training Range, assigned to the United States Air Force Air Combat Command. The group is stationed at Nellis Air Force Base, Nevada.
It provides day-to-day control of the Nevada Test and Training Range (NTTR) and directly supports Air Force, joint and multi-national test and training activities; and operates two Air Combat Command bombing ranges; the NTTR and Leach Lake Tactics Range, near Barstow, California.
During World War II, the group's predecessor unit, the 98th Bombardment Group was a Consolidated B-24 Liberator heavy bomb group that fought in North Africa and Italy. Two of its members, Colonel John R. (Killer) Kane and First Lieutenant Donald Pucket were awarded the Medal of Honor for their actions in combat. The group flew a total of 417 missions, earning a total of 15 battle streamers as well as two Presidential Unit Citations.
In the postwar era, the 98th Bombardment Group was one of the first United States Army Air Forces units assigned to Strategic Air Command (SAC) on 1 July 1947, prior to the establishment of the USAF. Equipped with low-hour Boeing B-29 Superfortress World War II aircraft, it was deployed to Far East Air Force in 1950 and flew combat missions over North Korea early in the Korean War. The group was inactivated in 1952 when the parent wing adopted the Tri-Deputate organization and assigned all of the group's squadrons directly to the wing. It was reactivated in 1987 as the 98th Air Refueling Group, Heavy; as an Air Force Reserve associate unit of the 434th Air Refueling Wing.Dornier Do 19
The Dornier Do 19 was a German four-engine heavy bomber that first flew on 28 October 1936. Only one prototype flew, and it was converted to a transport in 1938. The other two were scrapped.
The Luftwaffe had a shortcoming in the lack of an efficient heavy bomber fleet. Generalleutnant Walther Wever, the Luftwaffe's first Chief of Staff, was the most persistent advocate of a German long-range strategic bomber fleet. It was built for the Luftwaffe's Ural bomber program under General Wever, competing against the Junkers Ju 89. The RLM Technisches Amt issued a specification for a four-engine heavy bomber. But after Wever's death in an airplane crash in June 1936, Wever's successor, Albert Kesselring, canceled Germany's long-range bomber projects to concentrate on tactical bombers.
Both Dornier and Junkers were competitors for the contract, and each received an order for three prototypes in late 1935. The Dornier design was given the project number Do 19, while the Junkers prototype became the Ju 89.Kawasaki Ka 87
The Dornier N was a bomber aircraft designed in Germany in the 1920s for production in Japan. Production of 28 aircraft started in Japan in 1927, as the Kawasaki Ka 87 (also known as the Type 87 Night Bomber). Designed and built as a landplane, its layout was strongly reminiscent of the Dornier flying boats of the same period; a parasol-wing, strut-braced monoplane with two engines, mounted in a push-pull nacelle above the wing. Some of the 28 examples built saw action in Manchuria in 1931.List of Royal Air Force conversion units
Conversion units and operational conversion units (OCU) were training units of the Royal Air Force.List of bomber aircraft
The following is a list of bomber airplanes and does not include bomber airships, organized by era and manufacturer. A bomber is a military aircraft designed to attack ground or sea targets.Mitsubishi Ki-1
The Mitsubishi Ki-1, also known as Mitsubishi Army Type 93 Heavy Bomber, was a bomber built by Mitsubishi for the Imperial Japanese Army in the 1930s, which flew for the first time in 1933. Despite its antiquated appearance, the Ki-1 was used in Manchukuo and in north China during the early stages of the Second Sino-Japanese War, in areas where danger from enemy fighter aircraft was minimal.Mitsubishi Ki-20
The Mitsubishi Ki-20 is a Japanese bomber variant of the Junkers G.38 airliner. Mitsubishi manufactured six aircraft under license from Junkers. These aircraft, designated Army Type 92 Heavy Bomber, served through the 1930s. During World War II, the Ki-20 served in a variety of transport and support roles.Mitsubishi Ki-21
The Mitsubishi Ki-21 (or "Type 97 Heavy Bomber") (九七式重爆撃機 Kyūnana-shiki jūbakugekiki) (Allied reporting name: "Sally" /"Gwen") was a Japanese heavy bomber during World War II. It began operations during the Second Sino-Japanese War participating in the Nomonhan Incident, and in the first stages of the Pacific War, including the Malayan, Burmese, Dutch East Indies and New Guinea Campaigns. It was also used to attack targets as far-flung as western China, India and northern Australia.Mitsubishi Ki-67
The Mitsubishi Ki-67 Hiryū (飛龍, "Flying Dragon"; Allied reporting name "Peggy") was a twin-engine medium bomber produced by Mitsubishi and used by the Imperial Japanese Army Air Force and Imperial Japanese Navy Air Service in World War II. Its Army long designation was "Army Type 4 Heavy Bomber" (四式重爆撃機). Its Navy designations were "P2M" and "Q2M".Nakajima G10N
The Nakajima G10N Fugaku (Japanese: 富岳 or 富嶽, "Mount Fuji"), was a planned Japanese ultra-long-range heavy bomber designed during World War II. It was conceived as a method for mounting aerial attacks from Japan against industrial targets along the west coast (e.g., San Francisco) and in the Midwest (e.g., Detroit, Chicago, and Wichita) and the northeast (e.g., New York and Norfolk) of the United States. Japan's worsening war situation resulted in the project's cancellation in 1944 and no prototype was ever built.Nakajima Ki-49
The Nakajima Ki-49 Donryu (中島 キ-49 呑龍) "Storm Dragon" was a twin-engine Japanese bomber aircraft of World War II. Despite its official name as Army Type 100 Heavy Bomber, the requirements of the Ki-49 – to operate unescorted, with heavy defensive armament and armor – restricted it to a small bomb load, initially 1,000 kg (2,200 lb).
A mid-wing, cantilever monoplane of all-metal construction, the Ki-49 was one of the first Japanese aircraft fitted with a retractable tailwheel. During World War II, it was known to the Allies by the reporting name "Helen".No. 166 Squadron RAF
No. 166 Squadron RAF was a Royal Air Force squadron that formed just after the end of World War I. It was the first and one of only three to be equipped with the Handley Page V/1500 heavy bomber.No. 195 Squadron RAF
No. 195 Squadron was a Royal Air Force aircraft squadron that operated during the Second World War, at first in the ground attack role and later as heavy bomber unit with the Avro Lancaster.San Pancrazio Airfield
San Pancrazio Airfield is an abandoned Second World War military airfield in Italy, located approximately 4 km northeast of San Pancrazio Salentino in the province of Brindisi in Apulia,on the south-east Italy coast. Built in 1943 by United States Army Engineers, the airfield was primarily a Fifteenth Air Force B-24 Liberator heavy bomber base used in the strategic bombing of Germany. San Pancrazio was also used by tactical aircraft of Twelfth Air Force in the Italian Campaign.
Known units assigned to the airfield were:
82d Fighter Group, 3–10 October 1943, P-38 Lightning, (12AF)
340th Bombardment Group, 16 October-19 November 1943, B-25 Mitchell, (12AF)
376th Bombardment Group, 17 November 1943 – 19 April 1945, B-24 Liberator, (15AF)
451st Bombardment Group, 5 March-6 April 1944, B-24 Liberator, (15AF)San Pancrazio Airfield is probably the best-preserved American heavy bomber base in Italy. Most of the main runway and taxiways remain, along with numerous dispersal pads. Numerous remains of wartime buildings are also visible. After the war, the airfield may have been used as San Pancrazio Airport, but today several agricultural buildings are on the main runway. The grass areas of the airfield are used as agricultural fields, but most of the concreted areas remain.Tupolev TB-3
The Tupolev TB-3 (Russian: Тяжёлый Бомбардировщик, Tyazholy Bombardirovschik, Heavy Bomber, civilian designation ANT-6) was a heavy bomber aircraft which was deployed by the Soviet Air Force in the 1930s and during World War II. It was the world's first cantilever wing four-engine heavy bomber. Despite obsolescence and being officially withdrawn from service in 1939, the TB-3 performed bomber and transport duties throughout much of World War II. The TB-3 also saw combat as a Zveno project fighter mothership and as a light tank transport.Tupolev Tu-95
The Tupolev Tu-95 (Russian: Туполев Ту-95; NATO reporting name: "Bear") is a large, four-engine turboprop-powered strategic bomber and missile platform. First flown in 1952, the Tu-95 entered service with the Soviet Union in 1956 and is expected to serve the Russian Aerospace Forces until at least 2040.
A development of the bomber for maritime patrol is designated Tu-142, while a passenger airliner derivative was called Tu-114.
The aircraft has four Kuznetsov NK-12 engines with contra-rotating propellers. It is the only propeller-powered strategic bomber still in operational use today. The Tu-95 is one of the loudest military aircraft, particularly because the tips of the propeller blades move faster than the speed of sound. Its distinctive swept-back wings are set at an angle of 35°. The Tu-95 is unique as a propeller-driven aircraft with swept wings that has been built in large numbers.
Modern military aircraft types and roles