Junkers Ju 52
|A CASA 352L painted to represent a Junkers Ju 52/3m at the National Museum of the United States Air Force|
|First flight||13 October 1930 (Ju 52/1m); 7 March 1932 (Ju 52/3m)|
The Junkers Ju 52 (nicknamed Tante Ju ("Aunt Ju") and Iron Annie) was a German trimotor transport aircraft manufactured from 1931 to 1952. It saw both civilian and military service during the 1930s and 1940s. In a civilian role, it flew with over twelve air carriers including Swissair and Deutsche Luft Hansa as an airliner and freight hauler. In a military role, it flew with the Luftwaffe as a troop and cargo transport and briefly as a medium bomber. The Ju 52 continued in postwar service with military and civilian air fleets well into the 1980s.
- 1 Design and development
- 2 Operational history
- 3 Variants
- 4 Operators
- 5 Incidents and accidents
- 6 Survivors
- 7 Specifications (Junkers Ju 52/1m ce)
- 8 Specifications (Junkers Ju 52/3m ce)
- 9 Specifications (Junkers Ju 52/3m g7e)
- 10 See also
- 11 References
- 12 External links
Design and development
The Ju 52 was similar to the company's previous Junkers W33, although larger. In 1930, Ernst Zindel and his team designed the Ju 52 at the Junkers works at Dessau. The aircraft's unusual corrugated duralumin metal skin, pioneered by Junkers during World War I, strengthened the whole structure.
The Ju 52 had a low cantilever wing, the midsection of which was built into the fuselage, forming its underside. It was formed around four pairs of circular cross-section duralumin spars with a corrugated surface that provided torsional stiffening. A narrow control surface, with its outer section functioning as the aileron, and the inner section functioning as a flap, ran along the whole trailing edge of each wing panel, well separated from it. The inner flap section lowered the stalling speed and the arrangement became known as the Doppelflügel, or "double wing".
The outer sections of this operated differentially as ailerons, projecting slightly beyond the wingtips with control horns. The strutted horizontal stabilizer carried horn-balanced elevators which again projected and showed a significant gap between them and the stabilizer, which was adjustable in-flight. All stabilizer surfaces were corrugated.
The fuselage was of rectangular section with a domed decking, all covered with corrugated light alloy. There was a port side passenger door just aft of the wings, with windows stretching forward to the pilots' cabin. The main undercarriage was fixed and divided; some aircraft had wheel fairings, others not. There was a fixed tailskid, or a later tailwheel. Some aircraft were fitted with floats or skis instead of the main wheels.
In its original configuration, designated the Ju 52/1m, the Ju 52 was a single-engined aircraft, powered by either a BMW or Junkers liquid-cooled engine. However, the single-engine model was underpowered, and after seven prototypes had been completed, all subsequent Ju 52s were built with three radial engines as the Ju 52/3m (drei motoren - "three engines"). Originally powered by three Pratt & Whitney Hornet radial engines, later production models mainly received 574 kW (770 hp) BMW 132 engines, a licence-built refinement of the Pratt & Whitney design. Export models were also built with 447 kW (600 hp) Pratt & Whitney Wasp R-1340 and 578 kW (775 hp) Bristol Pegasus VI engines. The two wing-mounted radial engines of the Ju 52/3m had half-chord cowlings and diverted noticeably, being mounted at an almost perpendicular angle to the tapered wing's receding leading edge. The central engine had a cowling like a Townend ring as the fuselage behind it was increasing in diameter, though some later aircraft had deeper cowlings. Production Ju 52/3m aircraft flown by Luft Hansa before World War II, as well as Luftwaffe-flown Ju 52s flown during the war, usually used an air start system to turn over their trio of radial engines, using a common compressed air supply that also operated the main wheels' brakes.
Prewar civil use
In 1932, James A. Richardson's Canadian Airways received (Werknummer 4006) CF-ARM, the sixth ever-built Ju 52/1m. The aircraft, first re-engined with an Armstrong Siddeley Leopard radial engine and then later with a Rolls-Royce Buzzard and nicknamed the "Flying Boxcar" in Canada, could lift approximately three tons and had a maximum weight of 7 tonnes (8 tons). It was used to supply mining and other operations in remote areas with equipment too big and heavy for other aircraft then in use. The Ju 52/1m was able to land on wheels, skis or floats.
Before the nationalisation of the German aircraft industry in 1935, the Ju 52/3m was produced principally as a 17-seat airliner. It was used mainly by Luft Hansa and could fly from Berlin to Rome in eight hours. The Luft Hansa fleet eventually numbered 80 and flew from Germany on routes in Europe, Asia and South America.
Military use 1932-45
The Colombian Air Force used three Ju-52/3mde bombers equipped as floatplanes during the Colombia-Peru War in 1932–33. After the war, the air force acquired three other Ju-52mge as transports; the type remained in service until after World War II.
Bolivia acquired four Ju-52s in the course of the Chaco War (1932-1935), mainly for medical evacuation and air supply. During the conflict, the Ju-52s alone transported more than 4,400 tons of cargo to the front.
In 1934, Junkers received orders to produce a bomber version of the Ju 52/3m to serve as interim equipment for the bomber units of the still-secret Luftwaffe until it could be replaced by the purpose designed Dornier Do 11. Two bomb bays were fitted, capable of holding up to 1,500 kg (3,300 lb) of bombs, while defensive armament consisted of two 7.92mm MG 15 machine guns, one in an open dorsal position, and one in a retractable "dustbin" ventral position, which could be manually winched down from the fuselage to protect the aircraft from attacks from below. The bomber could be easily converted to serve in the transport role. The Dornier Do 11 was a failure, however, and the Junkers ended up being acquired in much larger numbers than at first expected, with the type being the Luftwaffe's main bomber until more modern aircraft such as the Heinkel He 111, Junkers Ju 86 and Dornier Do 17 entered into service.
The Ju 52 first saw military service in the Spanish Civil War against the Spanish Republic. It was one of the first aircraft delivered to the fraction of the army in revolt in July 1936 as both a bomber and transport. In the former role, it participated in the bombing of Guernica. No more of the bomber variant were built after this war, though it was again used as a bomber during the bombing of Warsaw during the Invasion of Poland of September 1939. The Luftwaffe then relied on the Ju 52 for transport roles during World War II, including paratroop drops.
Heavy losses in combat
The first major operation for the aircraft was in Operation Weserübung, the attack on Denmark and Norway on 9 April 1940. Fifty-two Ju 52s from 1. and 8. Staffel in Kampfgeschwader 1 transported a company of Fallschirmjäger and a battalion of infantry to the northern part of Jutland, and captured the airfield at Aalborg, vital to support the operation in southern Norway. Several hundred Ju 52s were used to transport troops to Norway in the first days of this campaign. Later, Ju 52's participated in the attack on the Netherlands on 10 May 1940, where they were deployed in the first large-scale air attack with paratroops in history during the Battle for The Hague. No fewer than 280 Ju 52s were lost in that venture and in other places in the country, due to varying circumstances, among which were accurate and effective Dutch anti-aircraft defences and German mistakes in using soggy airfields not able to support the heavy craft. Thus, almost an entire year's production was lost in the Netherlands.
The Ju 52 were also used in the Battle of Crete in May 1941. Lightly armed, and with a top speed of only 265 km/h (165 mph) – half that of a contemporary Hurricane – the Ju 52 was very vulnerable to fighter attack and an escort was always necessary when flying in a combat zone. Many Ju 52's were shot down by anti-aircraft guns and fighters while transporting supplies, most notably during the desperate attempt to resupply the trapped German Sixth Army during the final stages of the Battle of Stalingrad in the winter of 1942-1943.
During the North African Campaign, the Ju 52 was the mainstay reinforcement and resupply transport for the Germans, starting with 20 to 50 flights a day to Tunisia from Sicily in November 1942, building to 150 landings a day in early April as the Axis situation became more desperate. The Allied air forces developed a counter-air operation over a two month period and implemented Operation Flax on 5 April 1943, destroying 11 Ju 52s in the air near Cape Bon and many more during bombing attacks on its Sicilian airfields, leaving only 29 flyable. That began two catastrophic weeks in which more than 140 were lost in air interceptions, culminated on 18 April with the infamous "Palm Sunday Massacre" in which 24 Ju 52's were shot down and another 35 staggered back to Sicily and crash-landed.
The seaplane version, equipped with two large floats, served during the Norwegian Campaign in 1940, and later in the Mediterranean theatre. Some Ju 52's, both floatplanes and landplanes, were also used as minesweepers, known as Minensuch aircraft in German, fitted with a 14 m diameter current-carrying ring under the airframe to create a magnetic field which triggered the mines.
Hitler's personal transport
Hitler used a Deutsche Luft Hansa Ju 52 for campaigning in the 1932 German election, preferring flying to transport by train. After he became German Chancellor in 1933, Hans Baur became his personal pilot, and Hitler was provided with a personal Ju 52. Named Immelmann II after the World War I ace Max Immelmann, it carried the registration D-2600. As his power and importance grew, Hitler's personal air force grew to nearly 50 aircraft, based at Berlin Tempelhof Airport and made up of mainly Ju 52s, which also flew other members of his cabinet and war staff. In September 1939 at Baur's suggestion, his personal Ju 52 Immelman II was replaced by the four-engined Focke-Wulf Fw 200 Condor, although Immelman II remained his backup aircraft for the rest of World War II.
Chiang Kai-shek's personal transport
Eurasia was the main Chinese Airliner Company in the 1930s and Ju 52 was the main airliner plane. One of them was commandeered by the Chinese Nationalist Party Government and became Chiang Kai-shek's personal transport.
Various Junkers Ju 52s continued in military and civilian use following World War II. In 1956, the Portuguese Air Force, who was already using the Ju 52s as a transport plane, employed the type as a paratroop drop aircraft for its newly organized elite parachute forces, later known as the Batalhão de Caçadores Páraquedistas. The paratroopers used the Ju 52 in several combat operations in Angola and other Portuguese African colonies before gradually phasing it out of service in the 1960s.
The Swiss Air Force also operated the Ju 52 from 1939 to 1982 when three aircraft remained in operation, probably the last and longest service in any air force. Museums hoped to obtain the aircraft, but they were not for sale. They are still in flying condition and together with a CASA 352 can be booked for sightseeing tours with Ju-Air. During the 1950s the Ju 52 was also used by the French Air Force during the Indo-China War as a bomber. The usage of these Junkers was quite limited.
The Spanish Air Force operated the Ju 52, nicknamed Pava, until well into the 1970s. Escuadrón 721 flying the Spanish-built versions, was employed in training parachutists from Alcantarilla Air Base near Murcia.
Some military Ju 52s were converted to civilian use. For example, British European Airways operated eleven ex-Luftwaffe Ju 52/3mg8e machines, taken over by the RAF, between 1946 and retirement in 1947 on intra-U.K. routes before the Douglas DC-3 was introduced to the airline. French airlines such as Societe de Transports Aeriens (STA) and Air France flew Toucans in the late 1940s and early 1950s.
Most Ju 52s were destroyed after the war, but 585 were manufactured after 1945. In France, the machine had been manufactured during the war by the Junkers-controlled Avions Amiot company, and production continued afterwards as the Amiot AAC 1 Toucan. In Spain, Construcciones Aeronáuticas SA continued production as the CASA 352 and 352L. Four CASA 352s are airworthy and in regular use today.
Data from;Junkers Aircraft & Engines 1913-1945
- Ju 52
- Prototype of the single-engined transport aircraft, of twelve laid down only six were completed as single-engined aircraft. First flight: 3 September 1930, powered by a BMWVIIau engine.
- Ju 52/1mba
- The prototype Ju 52, (c/n 4001, regn D-1974), re-designated after being re-engined with a single Junkers L-88 engine.
- Ju 52/1mbe
- Aircraft powered by BMW VIIau
- Ju 52/1mca
- D-1974 fitted with drag flaps and re-fitted with a BMW VIIau.
- Ju 52/1mcai
- D-2356, (c/n 4005), crashed in May 1934.
- Ju 52/1mce
- D-USON (c/n 4003) used as a target tug. D-2317, (c/n 4004), converted to a torpedo bomber in Sweden as the K 45
- Ju 52/1mdo:D-1974 fitted with a Junkers Jumo 4 engine as a testbed, re-registered as D-UZYP from 1937.
- Ju 52/1mbi
- The second prototype,(c/n 4002, regn D-2133), fitted with an 600 kW (800 hp) Armstrong Siddeley Leopard engine.
- Ju 52/1mci
- The second prototype fitted with 11.05 m (36 ft 3 in) long stepped floats, flying from the River Elbe on 17 July 1931
- Ju 52/1mdi
- The second prototype after having the floats removed and undercarriage reinstated, registered as D-USUS from 1934.
- Ju 52/3m
- Three-engine prototype, powered by three 410 kW (550 hp) Pratt & Whitney R-1340 Wasp engines. First flight: 7 March 1932
- Ju 52/3mce
- Three-engine civil transport aircraft.
- Ju 52/3mge
- Interim bomber and transport aircraft for the Luftwaffe.
- Ju 52/3mg3e
- Improved military version, powered by three 541 kW (725 hp) BMW 132-A3 (improved version of the Pratt & Whitney R-1690 Hornet) radial engines, equipped with an improved radio and bomb-release mechanism.
- Ju 52/3mg4e
- Military version. The tailskid was replaced by a tailwheel.
- Ju 52/3mg5e
- Military version, powered by three 619 kW (830 hp) BMW 132T radials. It could be fitted with interchangeable floats, skis and wheel landing gear.
- Ju 52/3mg6e
- Equipped with a simplified radio.
- Ju 52/3mg7e
- Fitted with an autopilot and a large loading hatch.
- Ju 52/3mg8e
- Fitted with an extra cabin-roof hatch.
- Ju 52/3mg9e
- Late production version, fitted with strengthened landing gear and glider towing gear.
- Ju 52/3mg10e
- Similar to the Ju 52/3mg9e, but it could be fitted with floats or wheels.
- Ju 52/3mg11e
- No details are known.
- Ju 52/3mg12e
- Powered by three BMW 132L radials.
- Ju 52/3m12e
- Some Ju 52/3mg12s were sent to Luft Hansa.
- Ju 52/3mg13e
- No details are known.
- Ju 52/3mg14e
- this was the last German production version.
- A.A.C. 1 Toucan
- Post-war French version, 415 built.
- CASA 352
- Post-war Spanish version, 106 built.
- CASA 352L
- Spanish version with Spanish 578 kW (775 hp) ENMA Beta B-4 (license-built BMW 132) engines, 64 built.
- Designation assigned to a single example operated by the United States Army Air Forces.
- Designation used by the Spanish Air Force.
- Tp 5
- Designation used by the Swedish Air Force.
- K 45c
- A single Ju 52/1mce (c/n:4004) was deliverd to the Junkers factory at Limhamm in Sweden, where it was converted to a torpedo bomber as the K 45c.
- South Africa
- Soviet Union
- Spanish State
- United Kingdom
- United States
Incidents and accidents
As of 2008, eight Ju 52 remain in operation, four of which operate pleasure flights from Dübendorf airport in Switzerland. Lufthansa operates one Ju 52/3m (D-AQUI) for air shows and pleasure flights.
Aircraft On Display
- Junkers Ju 52/3m (Amiot AAC.1 Toucan) is on display at the Deutsches Technikmuseum in Munich. Ex FAF 363
- Junkers Ju 52/3m (CASA 352L, c/n 016) is on display at the Flugausstellung Leo Junior at Hermeskeil, Germany.
- Junkers Ju 52/3m (D-AZAW) is on display at the Deutsches Technikmuseum in Berlin
- Junkers Ju 52/3m is on display at the Technikmuseum "Hugo Junkers" in Dessau, which is situated in that place, where Junkers airplanes have been produced at the Junkers factory until 1945.
- Junkers Ju 52/3m g4e (WNr.6693) is on display at "Ju 52 Hangar" of Traditionsgemeinschaft Lufttransport Wunstorf e. V.(Air Transport Community of Tradition) near Wunstorf/Germany.
- Junkers Ju 52/3m (WNr.4043) is on display at the Museo Nacional de Aeronáutica (National Air Museum) in Morón.
- Junkers Ju 52/3m is on display at the Royal Museum of the Armed Forces and of Military History in Brussels.
- Junkers Ju 52/3m ge (WNr.5023 AMC-625) is display at the MAECO Museum of Colombian Air Force in El Dorado Airport, Bogotá, Colombia.
- An Amiot AAC.1 Toucan was acquired in 2011 by the Association des Mécanicians-Pilotes d'Aéronefs Anciens', Brétigny-sur-Orge, Essonne, France. Formerly with the Portuguese Air Force as 6311, it had been stored for over 40 years at the Portuguese Air Force Museum, Alverca do Ribatejo.
- Junkers Ju 52/3m (CASA 352L)(LN-DNL) is on display at the Norwegian National Museum of Aviation, Bodø, Norway.
- Junkers Ju 52/3m g4e (CA+JY) is on display at the Norwegian Armed Forces Aircraft Collection at Gardermoen near Oslo, Norway.
- Junkers Ju 52/3m g10e (Amiot AAC.1 Toucan) previously exhibited in Duxford is on display at the Polish Aviation Museum in Cracow.
- Junkers Ju 52/3m ge is on display at the Museu do Ar in Sintra, Portugal.
- Junkers Ju 52/3m (Amiot AAC.1 Toucan) 7208 ex F-BBYB is on display at the Belgrade Aeronautical Museum
- Junkers Ju 52/3m (CASA 352) is on display at the Spanish Air Museum in Cuatro Vientos (Madrid, Spain).
- United Kingdom
- United States
- Junkers Ju 52/3m (CASA 352L) is on display at the Steven F. Udvar-Hazy Center of the National Air and Space Museum in Chantilly, Virginia.
- Junkers Ju 52/3m (CASA 352L) is at the National Museum of the United States Air Force in Dayton, Ohio. The aircraft was donated to the museum by the Spanish government in 1971. After being on display outside for 40 years the aircraft has been placed in indefinite storage to protect it from further deterioration.
- Junkers Ju 52/3m (CASA 352L) (N352JU) is on display at the Military Aviation Museum, Virginia Beach, Virginia.
Specifications (Junkers Ju 52/1m ce)
Data from Wolfgang Wagner
- Crew: two
- Capacity: 1,820 kg (4,000 lb) of freight
- Length: 18.50 m (60 ft 8 in)
- Wingspan: 29.50 m (96 ft 9 in)
- Height: 4.65 m (15 ft 3 in)
- Wing area: 116 m² ()
- Empty weight: 4,000 kg (8,830 lb)
- Max. takeoff weight: 7,000 kg (15,450 lb)
- Powerplant: 1 × BMW VIIaU V-12 piston engine, 507 kW (680 hp)690 PS
- Maximum speed: 195 km/h (121 mph) at sea level
- Cruise speed: 160 km/h (100 mph)
- Range: 1,000 km (620 mi)
- Service ceiling: 3,400 m (11,150 ft)
- Rate of climb: 2.30 m/s at sea level (450 ft/min) 8.6 min to 1,000 m (3,300 ft); 20.5 min to 2,000 m (6,600 ft)
- Wing loading: 60.34 kg/m² ()
- Power/mass: 13.8 kg/kW (10.14 kg/PS)
Specifications (Junkers Ju 52/3m ce)
Data from Wolfgang Wagner "Hugo Junkers Pionier der Luftfahrt - Seine Flugzeuge" Bernard & Graefe Verlag, Bonn 1996 ISBN 3-7637-6112-8 (in German) p. 358
- Crew: two
- Capacity: 17 passengers
- Length: 18.90 m ()
- Wingspan: 29.25 m ()
- Height: 6.10 m ()
- Wing area: 110.5 m² ()
- Empty weight: 5,970 kg (13,180 lb)
- Max. takeoff weight: 9,210 kg (20,330 lb)
- Powerplant: 3 × BMW Hornet A2, 386 kW (525 PS) each
- Maximum speed: 271 km/h (168 mph) at 900 m
- Cruise speed: 222 km/h (138 mph)
- Range: 950 km (590 mi)
- Service ceiling: 5,200 m (17,050 ft)
- Rate of climb: 3.90 m/s ()
- Wing loading: 83.35 kg/m² ()
- Power/mass: 7.95 kg/kW (5.85 kg/PS)
Specifications (Junkers Ju 52/3m g7e)
Data from Jane’s Fighting Aircraft of World War II
- Crew: three (two pilots, radio operator)
- Capacity: 18 troops or 12 litter patients
- Length: 18.90 m (62 ft 0 in)
- Wingspan: 29.25 m (95 ft 10 in)
- Height: 4.5 m (14 ft 10 in)
- Wing area: 110.5 m² (1,190 ft²)
- Empty weight: 6,510 kg (14,325 lb)
- Loaded weight: 9,200 kg (20,270 lb)
- Max. takeoff weight: 10,990 kg (24,200 lb)
- Powerplant: 3 × BMW 132T radial engines, 533 kW (715 hp) each
- Maximum speed: 265 km/h (165 mph) at sea level
- Cruise speed: 211 km/h (132 mph)
- Range: 870 km (540 mi)
- Service ceiling: 5,490 m (18,000 ft)
- Rate of climb: 17 minutes to 3,050 m (10,000 ft)
- Guns: * 1 × 13 mm (.51 in) MG 131 machine gun in a dorsal position
- 2 × 7.92 mm (.312 in) MG 15 machine guns
- Bombs: up to 500 kilograms (1,100 lb) of bombs (some variants)
- Related development
- Aircraft of comparable role, configuration and era
- Related lists
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- Originally measured as 690 PS
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|Wikimedia Commons has media related to Junkers Ju 52.|
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