Junkers Ju 87 Stuka: Germany's WW2 Dive Bomber

The Junkers Ju 87, universally known as the Stuka (from the German Sturzkampfflugzeug, or "dive bomber"), was the most recognisable dive bomber of the Second World War, instantly identifiable by its inverted gull wings, fixed spatted undercarriage and the wailing sirens mounted on its wheel legs. Designed by Hermann Pohlmann and first flown on 17 September 1935, the type had already been combat-tested with the Condor Legion in Spain before the Second World War began. Rugged, accurate and devastating against ground targets with no air opposition, the Stuka became the signature weapon of the early Blitzkrieg campaigns before its slow speed and weak defensive armament made it dangerously vulnerable once it met organised fighter opposition.

Origins and Design

Pohlmann's design philosophy held that a dive bomber needed to be simple and rugged above all else, and the Ju 87 carried that conviction through every airframe it produced: a fixed, "spatted" undercarriage replaced a retractable gear that would have added weight and complexity for no operational benefit, and the double-spar inverted gull wing became the type's most distinctive visual signature. Ernst Udet, an early and influential champion of dive-bombing within the Reichsluftfahrtministerium, backed the concept after flying an American Curtiss Hawk, and Pohlmann's design was chosen for production over the rival Henschel Hs 123 despite the Henschel's early lead in the competition. A small Condor Legion detachment took a single Ju 87 A-0 to Spain in August 1936, and three production Ju 87 As followed in January 1938; both deployments flew anti-shipping and ground-support missions in support of Franco's Nationalist forces until returning to Germany in October 1938, giving Luftwaffe planners real combat data before the type saw action against Poland.

The Stuka's most distinctive engineering feature was an automatic pull-up system, intended to save the aircraft even if its pilot blacked out from the sustained high g-forces of a steep dive; a pre-set contact altimeter released the bombs and initiated recovery automatically once the aircraft passed a chosen altitude, an important safety margin given how close to the ground Stuka pilots pressed their attacks for accuracy. Equally famous were the wind-driven sirens fitted to the leading edge of the fixed undercarriage fairings, nicknamed the Jericho-Trompete ("Trumpet of Jericho") in wartime propaganda though officially designated the more prosaic Lärmgerät ("noise device"). The sirens wailed as the aircraft dived, terrorising troops and civilians on the ground below, though they cost the aircraft 20 to 25 km/h in drag and were removed from many later production runs once the psychological shock value had worn thin; some units instead fitted small whistles to the bomb fins to keep the noise without the airframe penalty. Both features fed the aircraft's reputation as a psychological weapon nearly as much as a physical one, particularly during the campaigns in Poland and France where its dive-bombing accuracy against fixed and semi-fixed targets went largely unopposed from the air.

Junkers Ju 87 Stuka Specifications

Variants

Not every sub-type is listed separately below. The Ju 87H was a disarmed dual-control trainer conversion of D-series airframes, and the Ju 87K designation covered a handful of export proposals that saw little production. Total wartime output is difficult to pin down exactly: Junkers's own delivery records list 5,126 aircraft handed over to the Luftwaffe, while other wartime industry tallies cited by historians put total production, including incomplete and repair-line airframes, as high as 6,500. Most modern references settle on a working estimate of roughly 5,700 to 6,500 Ju 87s of all versions built between 1936 and August 1944.

The Ju 87A was the initial production version, powered by the modest Jumo 210 engine series and limited in useful bomb load; around 262 had been built by mid-1938, enough to work out the type's early handling quirks before the far more numerous B-series arrived. The Ju 87B became the first mass-produced variant, and the one that carried out the Blitzkrieg campaigns of 1939-1940: six pre-production B-0s were converted from A airframes, and the production B-1 paired a 1,200 hp Jumo 211D engine with a redesigned fuselage, simplified landing-gear spats and up to 1,000 kg of bombs. By the outbreak of war the Luftwaffe already had 336 B-1s on hand, and later B-2 sub-variants added ski undercarriage kits for winter operations and a tropical filter package, the Ju 87 B-2 trop, for North Africa and the Mediterranean; export B-2s went to Italy's Regia Aeronautica, which nicknamed the type "Picchiatello," as well as to Hungary, Bulgaria and Romania.

The Ju 87R added extra fuel tankage to the B airframe for longer-range anti-shipping work over the Mediterranean and North Sea, a straightforward but valuable modification once the B-2's limited radius proved insufficient for maritime patrol; 105 R-1s and a further seven R-2s had been completed by mid-1940, with the R-1s subsequently converted to R-2 standard and 616 more R-2s ordered as the type took over most long-range strike duties from the B-series in the second half of 1940.

The Ju 87C, ordered from 18 August 1937 for the Kriegsmarine's planned aircraft carrier Graf Zeppelin, added folding wings, an arrester hook and a two-seat rubber dinghy plus wing and fuselage flotation bags that could keep a ditched aircraft afloat for up to three days. The type's prototype, the V10, was delayed by production problems and did not fly until 17 March 1938, after which it was designated the Ju 87 C-1; testing continued through 915 arrested landings by December 1939, and roughly 120 production C-1s were built at Weserflug's Bremen plant between July 1940 and August 1941. A parallel order for a further 120 Ju 87 C-1s was cancelled outright on 6 October 1939 as the war made the carrier programme's future doubtful, and on 18 May 1940 production of the C-1 itself was switched to the R-1 once the naval-specific equipment looked increasingly unlikely to see carrier service; the Graf Zeppelin was never completed, and the naval Stukas that had already been built were dispersed to land-based units instead.

The Ju 87D series, ordered into development after Battle of Britain losses had already exposed the type's vulnerability, was the most heavily produced version. Five prototypes, the Ju 87 V21 to V25, were ordered in June 1941, and the production D-series combined a more powerful 1,300-1,420 hp Jumo 211J engine with better-streamlined oil and water coolers, a redesigned and better-protected cockpit, and a new twin-barrel 7.92 mm MG 81Z tail gun with a far higher rate of fire than the earlier single MG 15. Bomb load rose sharply across the series, up to a maximum overload figure of 1,800 kg for short-range missions, more than triple the 500 kg the original B-model typically carried. Sub-variants covered specialised roles including the D-2 glider tug, the D-3 with extra armour for ground-attack work, the D-4 torpedo bomber intended for the never-completed Graf Zeppelin, and the D-5, which used a temporarily lengthened wing until the more powerful Jumo 213 engine made the extra span unnecessary; the D-7 and D-8 added flame dampers for night operations. Early production ran badly behind schedule, with Weserflug managing only a handful of the hundreds of D-1s the Air Ministry wanted through most of 1941, but by the time production ended in 1944 roughly 3,300 Ju 87s, the great majority D-1, D-2 and D-5 sub-types, had been built at the company's Bremen and Berlin-Tempelhof plants.

The Ju 87G, converted from D-series airframes from early 1943, was a dedicated tank-killer, replacing the bomb load entirely with a pair of underwing 37 mm BK 3,7 anti-tank cannon, each firing tungsten-cored armour-piercing rounds capable of penetrating a Soviet tank's thinner top and rear armour from a shallow diving pass. The first cannon-armed test aircraft flew on 31 January 1943, piloted by Hauptmann Hans-Karl Stepp near the Bryansk training area, and Stepp reported that the drag of the underwing pods cut top speed to just 259 km/h and made the aircraft noticeably less agile than the standard D-series; an earlier Luftwaffe evaluation had judged the installation unsuccessful enough that one officer recommended fitting the guns to the Messerschmitt Me 410 instead. Nicknamed the Kanonenvogel ("cannon-bird") once it reached front-line units, the G-1 was converted from older D airframes retaining the smaller wing, while the G-2 used the extended wing developed for the D-5; 208 G-2s were built new and at least 22 more converted from D-3 airframes, though only a handful of production Gs had reached front-line units by the Battle of Kursk in July 1943, where Hans-Ulrich Rudel flew the only officially converted Ju 87 G on the opening day of the offensive, alongside a larger number of D-series aircraft carrying the same cannon in an unofficial capacity.

Night-Harassment Units

By 1942 the Ju 87 was already being phased out of daylight ground-attack duty in favour of the Focke-Wulf Fw 190, but a second career opened up after the Luftwaffe noticed how effectively obsolete Soviet Polikarpov Po-2 and R-5 biplanes were harassing German troops at night with flares and small fragmentation bombs. Junkers offered a Ju 87 B-2, R-2 and R-4 conversion fitted with flame-dampening exhausts as early as July 1942, and once the RLM formally authorised the programme in November 1943, the resulting Störkampfstaffeln ("harassment squadrons") drew their airframes from D-5s awaiting repair and D-7/D-8 conversion kits rather than from dedicated new production. A repair depot at Wels-Lichtenegg overhauled 746 Ju 87s between May 1940 and November 1944, and over the winter of 1943-44 a Lower Saxony contractor alone converted roughly 300 D-3 and D-5 airframes to night configuration, stripping the dive brakes and fitting exhaust dampers to reduce the aircraft's visibility on nocturnal harassment sorties. Exact totals for how many airframes were eventually converted are not recorded, but the resulting Nachtschlachtgruppen flew slow, low-level nuisance and interdiction missions against Allied rear areas through 1944, including during the Battle of Normandy and the Battle of the Bulge, long after the type had become unsurvivable in daylight skies.

Poland and France, 1939-1940

The Ju 87's first combat mission of the Second World War came before Germany's declaration of war had even taken effect: at 04:26 on 1 September 1939, a flight of three Ju 87s from 3./StG 1 led by Oberleutnant Bruno Dilley attacked rail and signal targets at Dirschau on the Vistula, eleven minutes ahead of the formal opening of hostilities. That same morning, Leutnant Frank Neubert of I./StG 2 "Immelmann" shot down a Polish PZL P.11c fighter as it took off from Balice airfield, the first aerial victory of the war. With 366 Ju 87 As and Bs available on the eve of the invasion, the type flew almost unopposed in the air and inflicted severe damage on Polish rail networks, fortifications and retreating columns, a pattern it repeated on a larger scale during the invasion of France and the Low Countries the following spring.

When Fall Gelb opened on 10 May 1940, Stukas helped neutralise the fortress of Eben-Emael in Belgium within hours and destroyed a small headquarters building in Lanaken with four direct hits, disrupting the demolition of Belgian bridges along the Albert Canal and letting German armour advance faster than planned. Ju 87s went on to break up French armoured concentrations at Hannut and Gembloux, supported the drive through the Netherlands, and sank Dutch naval and merchant shipping evacuating the Dutch royal family and gold reserves; the campaign confirmed the type's value as flying artillery for a fast-moving ground offensive, so long as enemy fighters could be kept away from the battlefield.

Vulnerability in the Battle of Britain

The Ju 87's central weakness, slow speed, poor manoeuvrability, weak defensive armament and a predictable, telegraphed attack profile, had been masked during the Polish and French campaigns by the near-total absence of effective fighter opposition. The Battle of Britain removed that cover. Losses climbed steadily through the campaign, and on 18 August 1940, remembered afterward as "the Hardest Day" because both sides suffered so badly, 16 Stukas were shot down in a single day of fighting; the Luftwaffe's own quartermaster-general recorded 59 Ju 87s destroyed and 33 damaged over six weeks of operations, more than a fifth of the entire Stuka force lost between 8 and 18 August alone. The type was withdrawn from operations over Britain that same month, leaving the Luftwaffe without a dedicated precision ground-attack aircraft at exactly the moment an invasion of England was still notionally being planned. The lesson the Luftwaffe drew, that air superiority has to be won before a dedicated ground-attack aircraft can operate safely, became one of the most quoted tactical conclusions of the whole air war, and it shaped how both sides thought about escort and air-superiority missions for the rest of the conflict.

Mediterranean and North Africa

After the Battle of Britain, the Ju 87 saw little further use over western Europe, but it stayed effective in theatres where Allied fighter cover remained thin. From December 1940, roughly 80 Stukas of Fliegerkorps X, newly arrived in Sicily, were tasked with attacking British convoys resupplying Malta, and on 10 January 1941 they subjected the aircraft carrier HMS Illustrious to a sustained attack, scoring six direct hits and three damaging near-misses with 500 kg bombs; the carrier survived and reached Malta under her own power, but the raid demonstrated how dangerous the Ju 87 remained against ships without adequate air cover. During the German airborne assault on Crete in May 1941, Stukas helped sink the destroyer HMS Juno, damaged the battleship HMS Warspite, and inflicted heavy losses on the Royal Navy's Force D as it tried to intercept German seaborne reinforcements, a preview of the type's continued usefulness against shipping wherever Allied fighters could not reach it, including later over the siege of Malta.

Eastern Front

The Ju 87 flew in enormous numbers over the Eastern Front from the opening of Operation Barbarossa in June 1941, where the type's exposure to a Soviet fighter force that grew steadily stronger through the war meant that Stuka squadrons suffered very heavy attrition even as they kept flying. Stuka crews claimed a string of high-value naval targets around Leningrad that September, including direct hits that helped sink the Soviet battleship Marat in Kronstadt harbour, and the type remained the Luftwaffe's principal close-support aircraft through the advance to Stalingrad in 1942. By the Battle of Kursk in July 1943, the cannon-armed Ju 87 G had begun to reshape how the aircraft was used: operating under Fliegerkorps VIII, Rudel's cannon-equipped Stukas contributed to halting a Soviet offensive at Khotynets, reducing the Soviet 11th Guards Army from a larger force to just 33 tanks within days, and Ju 87 anti-tank sorties remained a fixture of the fighting around Orel and Belgorod that summer even as Field Marshal Erich von Manstein's Army Group South fought its own defensive battle further south. From 1944 the type was steadily replaced in the ground-attack role by cannon-armed versions of the Fw 190, though Ju 87 units, day and night, kept flying combat sorties on the Eastern Front until the closing weeks of the war.

Hans-Ulrich Rudel

No pilot is more associated with the Ju 87 than Hans-Ulrich Rudel, who flew the type almost exclusively through the entire war on the Eastern Front and became the most highly decorated German serviceman of the Second World War. Rudel was the officer who first suggested mounting the 37 mm anti-tank cannon under the Ju 87's wings after achieving success against Soviet armour with the smaller 20 mm MG 151/20, and flying the resulting cannon-armed Ju 87 G for much of his combat career, he is credited with destroying a very large number of Soviet tanks, figures commonly cited run into the hundreds, along with numerous other armoured vehicles, artillery pieces, ships and aircraft. On 8 February 1945 alone, with the war clearly lost, Rudel claimed 13 enemy tanks destroyed in a single day, a record built on flying combat sorties at a pace that vastly exceeded what most aircrew, on either side of the war, ever attempted. Rudel was shot down or forced to crash-land many times over the course of the war and lost part of a leg to a wound sustained in early 1945, yet continued flying combat missions afterward; his memoir Stuka Pilot, published after the war, remains one of the most widely read first-hand German combat-aviation accounts of the Eastern Front, though its claims, like most personal combat records from the war, are difficult to verify independently against Soviet loss records.

Operational Role in the Luftwaffe

The Stuka's dive-bombing accuracy made it a natural fit for the close air support doctrine underpinning German Blitzkrieg operations, working alongside fast-moving panzer spearheads to destroy fortified positions, artillery and armour that ground forces could not quickly reduce on their own. That role required air superiority to be secured first, typically by fighters such as the Messerschmitt Bf 109, since the Stuka itself carried barely enough defensive armament to discourage an unescorted attack, let alone survive a determined fighter assault. Alongside faster and better-defended medium bombers like the Heinkel He 111 and the Junkers Ju 88, the Ju 87 filled a specialised battlefield-support niche the Luftwaffe never fully replaced with a purpose-built successor, since no new dive bomber reached service before the war ended; from 1944 the ground-attack mission passed increasingly to the cannon-armed Focke-Wulf Fw 190 and, on paper at least, to dedicated anti-tank designs that never matured in time.

The Luftwaffe Beyond the Stuka

The Stuka's strengths and weaknesses only make sense against the wider Luftwaffe it flew alongside. Unlike the British and American air forces, Germany never developed four-engine strategic bombers in significant numbers, so its bomber force, the Ju 87, the He 111, the Ju 88 and the Dornier Do 17 among them, was built almost entirely around tactical and operational-level support for the army rather than independent strategic bombing deep into enemy territory. Fighter cover for that force rested overwhelmingly on the Messerschmitt Bf 109, which racked up a kill ratio commonly cited at around 9:1 against Allied aircraft over the course of the war and became the most widely produced fighter the Luftwaffe ever fielded, followed at a distance by the radial-engined Focke-Wulf Fw 190, credited with a still-formidable ratio of roughly 4:1. This combination of dive-bombers, medium bombers and capable escort fighters gave the Luftwaffe overwhelming battlefield dominance during the 1939-1941 campaigns, but by 1942 the balance had shifted: Soviet, British and American aircraft production and pilot training began outpacing Germany's, and even the arrival of genuinely advanced late-war designs such as the Messerschmitt Me 262 jet fighter could not offset chronic fuel shortages and a dwindling pool of experienced pilots. The Ju 87, tied to a doctrine of local air superiority that the Luftwaffe could no longer guarantee after 1942, ended the war fighting under conditions its designers had never intended it to face.

Surviving Aircraft

Only two complete Ju 87s survive today, both variants of the D/G family. A Ju 87 G-2, captured by British forces at Eggebek in Schleswig-Holstein in May 1945 and thought to have started life as a D-5 before being rebuilt with G-2 outer wings, is displayed at the Royal Air Force Museum in London; it briefly wore modified markings for the 1969 film Battle of Britain before being restored to its original G-2 configuration in 1998. A Ju 87 R-2/Trop, abandoned in North Africa and recovered by British forces in 1941, was later donated to the United States and fully restored in 1974; it is now on display at the Museum of Science and Industry in Chicago. A third aircraft, assembled from the wreckage of a Ju 87 R-4 shot down near Murmansk in 1942 and a second recovered airframe, has been under long-term restoration toward airworthy condition, a reminder of how few Stukas escaped the fighting that consumed so many of the roughly 5,700 to 6,500 that were built.