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The Heinkel 111 was the primary Luftwaffe medium bomber during the early stages of World War II, and is perhaps the most famous symbol of the German side of the Battle of Britain. By the time of that conflict, in 1940, the He 111 was nearing obsolescence. Nonetheless, it was produced until 1944, and used increasingly in the transport and re-supply role.
In the early 1930s Ernst Heinkel decided to build the world's fastest passenger plane, a lofty goal met with more than a little skepticism by the German aircraft industry and its newly evolving political leadership. Heinkel entrusted the development to the Günter brothers, fairly new to the company and untested.
The aircraft was superior to the already fast Lockheed 9 Orion that their design was competing against. The first example of their soon-to-be-famous Heinkel He 70 Blitz ("Lightning") rolled off the line in 1932 and immediately started breaking records. In its normal four passenger version its speed almost reach 200 mph (320 km/h), even though it was powered by only a single 600 hp (447 kW) BMW V1 engine. The elliptical wing, which the Günther brothers had already used in the Bäumer Sausewind sports plane before they joined Heinkel, became a feature in many subsequent designs the brothers developed.
The design immediately garnered the interest of the Luftwaffe, which was looking for medium bombers for military service.
The future Heinkel 111 was a more powerful twin-engine version of the Blitz, producing an aircraft that had many of the Blitz's features - including its elliptical inverted gull wing, small rounded control surfaces, and BMW engines. With location of the engines the only notable change in appearance, the new He 111 design was often called the Doppel-Blitz ("Double Lightning").
The first prototype, He 111 V1 (W.Nr. 713, D-ADAP), first flew from Rostock-Marienehe on 24 February 1935. It was followed by the civilian-equipped V2 and V4 in May 1935. The V2 (W.Nr. 715, D-ALIX) used the bomb bay as a four-seat "smoking compartment" with another six seats behind it in the rear fuselage. V2 entered service with Luft Hansa in 1936, along with five newly built versions known as the He 111 C. The design was only masquerading as an airliner. The aircraft was intended to be a bomber as the Luftwaffe began rearmament. The initial reports from the test pilot, Gerhard Nitschke, were favourable. It flight performance and handling were impressive although it dropped its wing in the stall. As a result the passenger variants had their wings reduced from 23 to 25 metres. The military aircraft, the V1, V3 and V5 spanned just 22.6 metres.
The first prototypes were underpowered, as they were powered only by 578hp BMW VI 6.0 six-cylinder in-line engines. This was eventually increased to 999 hp with the fitting of the DB (Daimler-Benz)600 engines into the V5, which became the prototype of the 'B' series.
Only Ten He 111 A-0 models based on the V3 were built, but they proved to be underpowered and were eventually sold to China. The first He 111B maid its maiden flight in the autumn of 1936. After improvements the Reichsluftfahrtministerium (RLM - Air Ministry) ordered 300 He 111B-1s; the first were delivered in January 1937. The B-2 variant had its engines upgraded to the supercharged DB 600C, of 850 hp or in some cases the 600G, of 925 hp. The B-2 began to roll of the production lines at the Heinkel works in Oranienburg in 1937. In late of 1937 the D-1 series entered production. However the DB600Ga engine with 1,074 hp, planned for this variant, was instead allocated to the Bf 109 and Bf 110 production lines. Heinkel then opted to use Jumo engines, and the He 111 V6 was tested with Juno 210 G engines but was vastly underpowered. However the improved 999 hp Juno 211 A-1 powerplant prompted the cancellation of the D series altogether and concentration on the design of the E series.
The E-1s came off the production line in February 1938, and a number of these aircraft served in the Condor Legion during the Spanish Civil War in March 1938. In a way the positive performance influenced later variants. The Luftwaffe believed that because the E variant outran enemy fighters there was no need to upgrade defensive weaponry, which would prove a mistake from the Battle of Britain onward. The fuselage bomb bay used four bomb racks, in later versions eight modular standard bomb racks designed to carry one SC 250, 250 kg bomb or four SC50, 50 kg bombs each in nose up orientation (which resulted in the bombs' doing a flip as they were dropped out of the aircraft). These modular standard bomb racks were a common feature on the first generation of Luftwaffe bombers (including the Junkers Ju 52), but it turned out that they limited the ordnance selection to bombs of only two sizes. Since they had to be built strongly enough to carry heavy bombs without contributing to the structural integrity of the aircraft, these racks were abandoned in later designs. The E-3 series was produced with only a few modifications, such as external bomb racks. The bomb bay was reduced on the E-5 to make way for fuel tanks which increased its range.
The He 111 design quickly ran though a series of minor design versions to fix one sort of problem or another. One of the more obvious changes started with the He 111 F models, which moved from the elliptical wing to one with straight leading and trailing edges, which could be manufactured more efficiently. The F-1 Series was entirley exported to Turkey and the 40 F-4s entered Luftwaffe service. At this time development began on the He 111J. It was powered by the DB 600 and was intended as a torpedo bomber. As a result it lacked an internal bomb bay and carried two external torpedo racks. The RLM gave an order for the bomb bay to be retrofitted; this variant became known as the J-1. In all but powerplant it was identical to the F-4.
The He 111 P incorporated the updated Daimler-Benz DB 601 and featured a newly designed nose section, including an asymmetric Ikaria nose mounting for an MG 15 machine gun, that replaced the 'stepped' cockpit with a roomier and aerodynamically favourable glazed 'dome' over the front of the aircraft. These improvements allowed the aircraft to reach 475 km/h at 5000 m and a cruise speed of 370 km/h, although a full bombload reduced this figure to 300 km/h. The design was implemented in 1937 because pilot reports indicated problems with visibility. After World War II, however, British Royal Navy test pilot Eric "Winkle" Brown, who had flown a number of captured later model He 111s, described the view through the redesigned nose as comparable to "looking down a glass tunnel."
Many of the He 111 Ps served during the Polish Campaign. With the Junkers Ju 88 experiencing technical difficulties, the He 111 and the Dornier Do 17 formed the backbone of the Kampfwaffe. On 1 September 1939 Luftwaffe records indicate the Heinkel strength at 705 (along with 533 Dorniers).
In 1940 the RLM abandoned further production of the P series in favour of the H versions.
Owing to the uncertainty surrounding the delivery and availability of the DB 601 engines, Heinkel began tests with the 1,100 hp (820 kW) Junkers Jumo 211 powerplants. The somewhat larger size and greater weight of the Jumo 211 engines were unimportant considerations for a twin engine design, and the Jumo was used on almost all early-war bomber designs. When the Jumo was fitted to the P model it became the He 111 H.
The P-series was gradually replaced on the eve of war with the new the H-2, powered by Jumo 211 A-3 engines. A count on 2 September 1939 revealed that the Luftwaffe had a total of 787 He 111s in service, with 705 combat ready, including 400 H-1 and H-2s that had been produced in a mere four months. Production of the H-3, powered by the 1,200 hp Jumo 211 D-1, began in November 1939. After the Battle of Britain a smaller scale production of the H-4s began. This variant differed from the H-3 in that could either carry 2.000 kg of bombs internally or mount one or two external racks to carry one 1.800 kg or two 1.000 kg bombs. As these external racks blocked the internal bomb bay doors a combination of internal and external storage was not possible. The H-5 series followed in February 1941, with heavier defensive armament. Some H-3 and H-4s were equipped with barrage balloon cable cutting equipment in the shape of cutter installations forward of the engines and cockpit. They were designated H-8, but later named H8/R2. These aircraft were difficult to fly and the production stopped.The H-6 initiated some all around improvements in design. The Jumo 211 F-1 engine of 1,350 hp increased its speed while the defensive armament was upgraded with one MG FF in the nose position, one MG 15 in the ventral turret and in each of the fuselage side windows (optional). Some H-6 variants carried tail-mounted MG 17 defensive armament. With the H-11 the Luftwaffe had at its disposal a powerful medium bomber with heavier armour and defensive armament.
One of the most interesting variants was as a glider tug, the He 111 Z, standing for Zwilling or twin. It was built from two 111 H-6s joined together with a connecting wing and a fifth engine and used to tow the giant Messerschmitt Me 321 or two Gotha Go 242 gliders. Ten He 111 Zs were built, and all served until destroyed one way or another.
At 14,000 kg take-off weight (carrying 2,000 kg of bombs internally), the He 111H achieved a top speed of 405 km/h at 6 km, improving to 435 km/h without the bomb load and at 50% fuel load. Still, this was considerably slower than the newer Junkers Ju 88 which entered service in 1940, so the He 111 was gradually withdrawn from the bomber role. The He 111 became a jack-of-all-trades as the war progressed, carrying out missions not even imagined even when the war started.
Nevertheless, the He 111 had to be kept in production until 1944 because the RLM failed to provide a successor : the He 177 Greif was plagued by engine problems, and the Bomber B program was eventually abandoned. The vast majority of the 7,300 He 111s produced would be the H models, largely identical to the first H introduced in 1939.
The Spanish company CASA also produced a number of heavily modified He 111s under license for indigenous use. These models were designed CASA 2.111 and served until 1965.
Bulgaria, China, Czechoslovakia (post-war), Germany : Luftwaffe, Hungary, Romania, Slovakia, Spanish State, Turkey (He111F variant).
Germany : Luft Hansa.
Only three original German built He 111s and fourteen Spanish built 12 2.111s survivors are on display or stored in museums around the world. Of the three complete German built Heinkels, one E-3 series with the 'conventional' cockpit is on display at Museo del Aire, Madrid, Spain, having served in the Condor Legion. The Second, an immaculately preserved He 111P-1, is on display at the Norwegian Air Force Museum at Gardemoen. The third, a H-20, is on display at the RAF Museum Hendon, London.
One Spanish 2.111D served as a transport for Spanish VIPs, including General Francisco Franco, before being purchased in England by the Commemorative Air Force in 1977. It remained the last He 111 in flyable condition until July 10, 2003, when it was destroyed in a fatal crash landing. The aircraft was attempting a landing at the Cheyenne Municipal Airport, near Cheyenne, Wyoming, while en route from Midland, Texas to an air show in Missoula, Montana. Eyewitness reports indicate the aircraft lost power to one engine on final approach and ploughed through a chain link fence before colliding with a school bus washing building under construction. Killed were CAF pilot Neil R. Stamp and co-pilot Charles S. Bates.
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