Junkers Ju 390
|Junkers Ju 390 V1|
|Role||Long range transport/maritime reconnaissance/bomber|
|First flight||20 October 1943|
|Number built||2 (V2 never flew)|
|Developed from||Junkers Ju 290|
The Junkers Ju 390 was a German long-range derivative of the Junkers Ju 290 aircraft, intended to be used as a heavy transport aircraft, maritime patrol aircraft and long-range bomber. It was one of the aircraft designs submitted for the abortive Amerika Bomber project, along with the Messerschmitt Me 264, the Focke-Wulf Ta 400 and the Heinkel He 277.
Design and development
The first prototype, V1 (bearing Stammkennzeichen code of GH+UK), was modified from the Ju 90 V6 airframe (Werknummer J4918, civil registration D-AOKD from July 1940 to April 1941, then to the Luftwaffe as KH+XC from April 1941 to April 1942, then returned to Junkers and used for Ju 390 V1 construction). It made its maiden flight on 20 October 1943 and performed well, resulting in an order for 26 aircraft, to be named Ju 390 A-1. None of these had been built by the time that the project was cancelled (along with Ju 290 production) in mid-1944. The second prototype, the V2 (RC+DA), was longer than the V1 because it was constructed from a Ju 290 airframe (using the fuselage of Ju 290 A-1 Werknummer J900155). The maritime reconnaissance and long-range bomber versions were to be called the Ju 390 B and Ju 390 C, respectively.
The Ju 390 V1 was constructed and largely assembled at Junkers' plant at Dessau in Germany and the first test flight took place on 20 October 1943. This was done by adding an additional wing section and powerplants and adding a fuselage section immediately aft of the wings to increase the length to 31 m (102 ft). Its performance was satisfactory enough that the Air Ministry ordered 26 in addition to the two prototypes. On 29 June 1944, the Luftwaffe Quartermaster General noted that the RLM paid Junkers to complete seven Ju-390 aircraft. The contracts for 26 Ju 390s were cancelled on 20 June 1944 and all work ceased in September 1944. On 26 November 1943, the Ju 390 V1—with many other new aircraft and prototypes—was shown to Adolf Hitler at Insterburg, East Prussia. According to the logbook of former Junkers test pilot Hans-Joachim Pancherz, the Ju 390 V1 was brought to Prague immediately after it had been displayed at Insterburg and took part in a number of test flights, which continued until March 1944, including tests of inflight refueling. The Ju 390 V1 was returned to Dessau in November 1944, where it was stripped of parts and finally destroyed in late April 1945 as the US Army approached.
Different sources present different accounts of the history of the Ju 390 V2. Kössler and Ott (1993) stated that the Ju 390 V2 was completed during June 1944, with flight tests beginning in late September 1944. The second prototype (Ju 390 V2) was configured for a maritime reconnaissance role, and its fuselage had been extended by 2.5 m (8.2 ft) for a total of length of 33.5 m (110 ft) and it was said to be equipped with FuG 200 Hohentwiel ASV (Air to Surface Vessel) radar and defensive armament consisting of five 20 mm MG 151/20 cannon. Green (1970) wrote that the armament was four 20 mm MG 151/20s and three 13 mm (.51 in) MG 131 machine guns. At a hearing before British authorities on 26 September 1945, Professor Heinrich Hertel, chief designer and technical director of Junkers Aircraft & Motor Works, asserted the Ju-390 V2 had never been completed. German author Friedrich Georg claimed in his book that test pilot Oberleutnant Joachim Eisermann recorded in his logbook that he flew the V2 prototype (RC+DA) on 9 February 1945 at Rechlin air base. The log is said to have recorded a handling flight lasting 50 minutes and composed of circuits around Rechlin, while a second 20-minute flight was used to ferry the prototype to Lärz. Kay (2004) stated that the second Ju 390 prototype was discarded without being flown because of a July 1944 RLM decree sanctioning an end to all large combat plane programs in Nazi Germany in favor of the Emergency Fighter Program. Pancherz himself stated in 1980 that the only the first Ju 390 flew and cast doubt all claims of the Ju 390 making a test flight to New York.
South Africa flight
A Ju 390 is claimed by some to have made a test flight from Germany to Cape Town in early 1944. The sole source for the story is a speculative article which appeared in the Daily Telegraph in 1969 titled "Lone Bomber Raid on New York Planned by Hitler", in which Hans Pancherz reportedly claimed to have made the flight. Author James P. Duffy has carried out extensive research into this claim, which has proved fruitless. Authors Kössler and Ott make no mention of this claim either, despite having interviewed Pancherz.
New York flight
The first public mention of an alleged flight of a Ju 390 to North America appeared in a letter published in the November 1955 issue of the British magazine RAF Flying Review, of which aviation writer William Green was an editor. The magazine's editors were skeptical of the claim, which asserted that two Ju 390s had made the flight and that it included a one-hour stay over New York City. In March 1956, the Review published a letter from an RAF officer which claimed to clarify the account. According to Green's reporting, in June 1944, Allied Intelligence had learned from prisoner interrogations that a Ju 390 had been delivered in January 1944 to Fernaufklärungsgruppe 5, based at Mont-de-Marsan near Bordeaux and that it had completed a 32-hour reconnaissance flight to within 19 km (12 mi) of the U.S. coast, north of New York City. This was rejected just after the war by British authorities. Aviation historian Dr. Kenneth P. Werrell states that the story of the flight originated in General Report on Aircraft Engines and Aircraft Equipment, two British intelligence reports from August 1944, which were based in part on the interrogation of prisoners. The reports claimed that the Ju 390 had taken photographs of the coast of Long Island but no photos or other evidence for the existence of such photos has ever been found.
The claimed flight was mentioned in many books following the RAF Flying Review account, including Green's respected Warplanes of the Second World War (1968) and Warplanes of the Third Reich (1970) but without ever citing reliable sources. Further authors then cited Green's books as their source for the claimed flight. Green told Kenneth P. Werrell many years later that he no longer placed much credence in the flight. Werrell later examined the data regarding the range of the Ju 390 and concluded that although a great circle round trip from France to St. Johns, Newfoundland was possible, adding another 3,830 km (2,380 mi) for a round trip from St. Johns to Long Island made the flight "most unlikely".
Karl Kössler and Günter Ott, in their book Die großen Dessauer: Junkers Ju 89, 90, 290, 390. Die Geschichte einer Flugzeugfamilie (The Big Dessauers... History of an Aircraft Family), also examined the claimed flight and debunked the flight north of New York. Assuming there was only one aircraft in existence, Kössler and Ott note it was nowhere near France at the time when the flight was supposed to have taken place. According to Pancherz' logbook, the Ju 390 V1 was brought to Prague on 26 November 1943. While there, it took part in test flights which continued until late March 1944. They also assert that the Ju 390 V1 prototype was unlikely to have been capable of taking off with the fuel load necessary for a flight of such duration due to strength concerns over its modified structure; it would have required a takeoff weight of 65 t (72 short tons), while the maximum takeoff weight during its trials had been 34 t (37 short tons). Another explanation for this is that prototypes are never flown at maximum gross weight for their maiden flight until testing can determine the aircraft's handling. According to Kössler and Ott, the Ju 390 V2 could not have made the US flight either, since they indicate that it was not completed before September/October 1944.
In his book The Bunker, author James P. O'Donnell mentions a flight to Japan. O'Donnell claimed that Albert Speer, in an early 1970s telephone interview, stated that there had been a secret Ju 390 flight to Japan "late in the war". The flight, by a Luftwaffe test pilot, had supposedly been non-stop via the polar route. O'Donnell is the sole source for the story; Speer never mentioned the story in any of his writings or other interviews. Kössler and Ott make no mention of the claim.
Ju 390 V1
- First prototype.
Ju 390 V2
- Second prototype.
Ju 390 A-1
- Planned heavy transport version.
Ju 390 B
- Planned maritime patrol version.
Ju 390 C
- Planned long-range heavy bomber version.
Some sources claim that a Ju 390 was assigned to Fernaufklärungsgruppe 5. Kössler and Ott state that it was not.
Specifications (Ju 390 A-1)
Data from The warplanes of the Third Reich
- Crew: 10
- Capacity: 10,000 kg (22,046 lb) typical freighter payload
- Length: 34.201 m (112 ft 2.5 in)
- Wingspan: 50.32 m (165 ft 1 in)
- Height: 6.88 m (22 ft 7 in)
- Wing area: 253.600 m2 (2,729.73 sq ft)
- Empty weight: 36,900 kg (81,350 lb)
- Max takeoff weight: 75,500 kg (166,450 lb)
- Fuel capacity: 34,096 l (9,007 US gal; 7,500 imp gal)
- Powerplant: 6 × BMW 801E 14-cylinder two-row air-cooled radial piston engines, 1,470 kW (1,970 hp) each for take-off
- 1,300 kW (1,740 hp) at 1,970 m (6,450 ft)
- 1,090 kW (1,460 hp) at 6,200 m (20,340 ft)
- Propellers: 3-bladed VDM constant-speed propellers
- Maximum speed: 505 km/h (314 mph, 273 kn) at 6,200 m (20,340 ft)
- Cruise speed: 357 km/h (222 mph, 193 kn) at 2,500 m (8,200 ft)
- Range: 8,000 km (4,970 mi, 4,320 nmi) Ju 390 V1 with 10,000 kg (22,046 lb) payload and 34,096 l (9,007 US gal; 7,500 imp gal) fuel at 330 km/h (210 mph; 180 kn) and 2,000 m (6,500 ft)
- Combat range: 9,704 km (6,030 mi, 5,240 nmi) (reconnaissance mission)
- Combat range (bomber mission): 9,254 km (5,750 mi; 4,997 nmi) with 1,930 kg (4,255 lb) bomb load
- Guns: (proposed)
- Hardpoints: 4 with a capacity of 3,968 lb (1,800 kg) each,
- Missiles: 4x Henschel Hs 293 or
Aircraft of comparable role, configuration and era
- Boeing B-29 Superfortress
- Focke-Wulf Ta 400
- Heinkel He 277
- Messerschmitt Me 264
- Nakajima G8N
- Nakajima G10N Fugaku
- Project Z in Japan
- List of bomber aircraft
- List of German aircraft projects, 1939–45
- List of military aircraft of Germany
- List of World War II military aircraft of Germany
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- Griehl and Dressel 1998, pp. 197–199.
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- Griehl 2006[page needed]
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