He 111H-3 Specifications
Crew: Pilot and four gunners/navigators/bomb-aimers
Powerplant: Two 1,200hp Junkers Jumo 211D-2 twelve cylinder engines
Span: 74 ft 1¾ in (22.60 m)
Length: 53 ft 9½ in (16.39 m)
Max Speed: 415 km/h (258 mph) at 16,000 ft
Armament: Six 7.92 mm (.312 in) machine guns in nose, dorsal, ventral gondola, beam, and tail positions. One 20 mm (.787 in) MG FF cannon in nose.
Bomb Load: Normal load of 4,410 lb (2,000 kg)
Image: A Heinkel He 111H bomber (V4+GU) of 10.Staffel/KG 1 in flight, Summer 1940. Bundesarchiv, Bild 101I-385-0587-07 / Wanderer, W. / CC-BY-SA 3.0
The Heinkel He 111 was a German twin-engine medium bomber that became the principal bomber of the Luftwaffe during the early years of the Second World War, including the Battle of Britain. Designed by twin brothers Siegfried and Walter Günter at Heinkel Flugzeugwerke, the aircraft was developed from the sleek, high-speed Heinkel He 70 Blitz, which had entered service with Deutsche Lufthansa in 1934 as a mail and passenger aircraft. The He 70 featured an advanced aerodynamic design with elliptical inverted gull wings and set multiple world speed records, drawing the attention of the Reichsluftfahrtministerium (RLM), which was seeking an aircraft that could serve both commercial and military purposes in preparation for the expansion of Germany’s clandestine air force.
The Günter brothers began work on a scaled-up, twin-engine version of the He 70. The resulting aircraft, nicknamed the Doppel-Blitz (“Double Blitz”), was an all-metal, low-wing monoplane with a semi-monocoque fuselage and a traditional stepped cockpit with separate windscreens for the pilot and copilot. The prototype, He 111 V1, first flew on 24 February 1935, powered by two BMW VI V-12 engines and reached a top speed of 349 km/h (217 mph). The second prototype, the He 111 V2, was a commercial version with a shortened wingspan and passenger accommodations for ten. It entered Lufthansa service in 1936, followed by five production aircraft designated He 111C.
The first true bomber variant was the He 111 V3, with a four-man crew, a 1,000 kg (2,204 lb) bomb load, and three 7.92 mm MG 15 defensive machine guns mounted in the nose, dorsal, and ventral positions. Ten He 111 A-0 pre-production aircraft were built based on this prototype, but performance was poor due to underpowered engines, and they were sold to China. A major improvement came with the He 111 V5, which incorporated Daimler-Benz DB 600 engines, boosting speed and overall capability. As a result, the He 111 B was ordered into large-scale production, entering Luftwaffe service in late 1936 and making its combat debut in March 1937 with the Condor Legion during the Spanish Civil War. At this stage, the He 111 could still outrun many contemporary fighters, reinforcing the Luftwaffe’s belief in speed over defensive armament for bomber survivability.
Subsequent development produced the He 111 F, which introduced a simplified, straight-edged wing for easier production, and the He 111 J, intended as a torpedo bomber for the Kriegsmarine, though it was later converted to a standard bomber role. The next major variant, the He 111 P, appeared in late 1938. It featured a distinctive, fully glazed, bullet-shaped “greenhouse” nose that offered improved visibility and concentrated most of the crew at the front of the aircraft. Powered by two DB 601 engines, it could carry up to 2,000 kg (4,410 lb) of bombs internally. Around 400 aircraft of the P-series were produced and saw extensive action in Poland, Norway, France, and Britain. However, production was phased out in early 1940 due to prioritization of the DB 601 engine for fighter aircraft like the Bf 109.
The most numerous variant was the He 111 H, developed in parallel with the P-series and powered by Junkers Jumo 211 engines. The H-series entered service in May 1939 and remained in production until October 1944, undergoing numerous upgrades. Early H variants had three MG 15 machine guns, but operational experience led to the addition of more defensive positions – including beam and tail guns – and increased crew armour. These improvements, while enhancing survivability, reduced speed and maneuverability.
During the Battle of Britain, the He 111 equipped around 15 Kampfgruppen operating under Luftflotten 2 and 3. While rugged and capable of sustaining significant battle damage due to self-sealing fuel tanks and armour plating, the He 111 was too slow and under-armed to operate effectively without fighter escort. Its large, glazed nose section, while useful for bombing accuracy and crew coordination, made it highly vulnerable to head-on attacks by RAF fighters. The aircraft’s limitations in daylight operations became apparent as losses mounted during the campaign.
Heinkel He 111 H-2 of 9./KG 53, September 1940
Despite these shortcomings, the He 111 remained central to the Luftwaffe’s bombing strategy. It played a major role in the transition to night raids during The Blitz. On 25 September 1940, 58 He 111s of Kampfgeschwader 55 (KG 55) bombed the Bristol Aeroplane Company works at Filton, killing nearly 200 people and halting aircraft production. The following day, the same unit severely damaged the Supermarine works at Woolston, although Spitfire production was quickly restored due to successful dispersal measures.
In the latter part of the Battle, some He 111s were equipped with advanced radio navigation systems such as Knickebein and X-Gerät, enabling precision night bombing even in poor visibility. Although gradually outclassed, the He 111 remained in frontline service until 1944, adapting to a variety of roles including torpedo bomber, glider tug, and transport aircraft. Its endurance and versatility made it a workhorse of the Luftwaffe’s bomber force throughout the war.