The Haunebu I first flew in 1939 and both prototypes made 52 test flights. In 1942, the enlarged Haunebu II of 26 meters diameter was ready for flight testing.

This disc had a crew of nine and could also achieve supersonic flight of 6,000 to 21,000 km/h with a flight endurance of 55 hours.

Both it and the further developed 32 meter diameter Haunebu II Do-Stra had heat shielding of two hulls of Victalen.

The craft were constructed and tested between 1943-44. The craft made 106 test flights.

By 1944, the perfected war model, the Haunebu II Do-Stra (Dornier STRAtospharen Flugzeug/Stratospheric Aircraft) was tested.

Two prototypes were built. These massive machines, several stories tall, were crewed by 20 men.

They were also capable of hypersonic speed beyond 21,000 km/h.

The SS had intended to produce the machines with tenders for both Junkers and Dornier but in late 1944/early 1945 Dornier was chosen.

The close of the war, however, prevented Dornier from building any production models.

Yet larger still was the 71 meter diameter Haunebu III. A lone prototype was constructed before the close of the war.

It was crewed by 32 and could achieve speeds of 7,000 to 40,000 km/h.

It had a triple Victalen hull. It is said to have had a flight endurance of 7 to 8 weeks.

The craft made 19 test flights. This craft was to be used for evacuation work for Thule and Vril in March 1945.
Further plans for a 120 meter diameter Haunebu IV were in the works but no such craft is known to have been
constructed before the end of the war.

https://www.bibliotecapleyades.net/ufo_aleman/esp_ufoaleman_3.htm

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