Junkers Ju 390 V1
Description
Role	Transport
Crew	8
First Flight	October 20, 1943
Entered Service	1943
Manufacturer	Junkers
Dimensions
Length	34.20 m	112 ft 2 in
Wingspan	50.30 m	165 ft 1 in
Height	6.89 m	22 ft 7 in
Wing area	254 m²	2,733 ft²
Weights
Empty	39,500 kg	86,900 lb
Loaded	53,112 kg	116,846 lb
Maximum takeoff	75,500 kg	166,100 lb
Powerplant
Engines	6x BMW 801E
Power	8,818 kW	11,820 hp
Performance
Maximum speed	505 km/h	314 mph
Range	9,700 km	6,027 miles
Service ceiling	6,000 m	19,680 ft
Rate of climb
Wing loading	209 kg/m²	43 lb/ft²
Power/Mass	0.17 kW/kg	0.10 hp/lb
Avionics
Armament
Guns	2x 20 mm MG 151/20 cannons in dorsal turrets 1 x 20 mm MG 151/20 in tail 2x 13 mm MG 131 machine guns at waist 2x 13 mm MG 131 in gondola

The Junkers Ju 390 was a long-range derivative of the Junkers Ju 290 and was intended to be used as a heavy transport, maritime patrol aircraft, and bomber. It was the design selected for the abortive Amerika Bomber project, and is the largest aircraft ever to have been built in Germany.

Two prototypes were created by inserting an extra pair of inner wing segments into the wings of basic Ju 290 airframes and adding new sections to "stretch" the fuselages. The resulting giant first flew on October 20, 1943 and performed well, resulting in an order for 26 such aircraft, to be designated Ju 390A-1. None of these were actually built by the time that the project was cancelled (along with Ju 290 production) in mid 1944. The maritime patrol version and bomber were to be designated Ju 390B and Ju 390C respectively. It was suggested that the bomber could have carried the Messerschmitt Me 328 parasite fighter for self-defence. Some test flights are believed to have been performed by Ju-390 aircraft with the anti-shipping Fritz-X guided smart-bomb.

Disputed New York flight in 1944

There is a heavily disputed claim that in January 1944, a Ju-390 prototype made a trans-atlantic flight from Mont-de-Marsan (near Bordeaux) to some 20 km (12 miles) of the coast of the United States and back. Critics claim FAGr.5 (Fernaufsklarungsgruppe 5) never flew such a flight. Supporters say the only link between FAGr.5 and the New York flight is the common use of an airfield at Mont-de-Marsan and the veracity of the New York flight is neither proved nor disproved by a lack of unit records for such a flight. Indeed the flight may have had nothing whatsoever to do with FAGr.5 operations.

Whilst the Ju-390's 32-hour endurance would have certainly made such a crossing theoretically possible, there is a lack of evidence to support the claim. Aviation historian Horst Zoeller claims the flight was recorded in Junkers company records.

Critics have also pointed to the vagueness of the aircraft's alleged position and even the date of what would have been a milestone flight. The best known (and maybe earliest publication) of the claim in English was in William Green's Warplanes of the Third Reich in 1970, where he wrote that the Ju 390 flew to "a point some 12 miles from the US coast, north of New York". Critics say the vagueness of detail and lack of corroborating evidence are hallmarks of an urban legend.

Critics believe that the aircraft would have had to overfly parts of the Massachusetts coast in order to fix their location, and point out the likelihood of the aircraft being spotted by observers and/or radar, which it was not. If New York state were meant, this would have put the aircraft closer to Boston. Critics ask why this city wasn't referred to for fixing the position of the claim. Finally, it is questioned how the aircrew would have been able to fix their position so accurately anyway.

Supporters argue that a Ju-390 crew could have obtained a highly accurate fix from public broadcast radio stations. Also that a Ju-390 would not have needed to overfly Massachusetts at all. They say there was no reason why New York City could not have been approached purely from the sea.

Supporters also note that the mission was designed to deliver a single bomb to New York and that such a bomb could only have been the atomic weapon under development. Japan and Germany at the time were using the "Harteck Process" of gaseous uranium centrifuges. Germany in 1944 was shipping both uranium ores and centrifuges to Japan by U-boat.

Supporters of the New York flight say of course the mission was kept secret so as not to tip off the US Government to provide better air defences. It was an ultra top secret test flight for the delivery of an atomic bomb.

Corroboration is gleened from the so-called Sanger sub-orbital bomber designed to attack New York from space with only a single bomb. Only one type of bomb was worth all the time and expense involved. Supporters say a mission so secret would never have found its way into FAGr.5 logbooks.

Supporters note the top secret unit, II/KG200 also flew the Ju-390 as did Junkers company test pilots in Czechoslovakia.

Following the war, Hitler's armaments minister Albert Speer also recounted to author James P O'Donnell that a Ju-390 aircraft flown by Junkers test pilots flew a polar route to Japan in 1944.