The Luftwaffe were building increasingly wacky aircraft – some shaped like discs or with circular wings.
A US Air Force probe concluded these experimental flying machines may be to blame for UFO sightings.
UFO hunters go further – and insist they still lie hidden in an underground base at the South Pole.
This all may sound ridiculously far fetched – until you see the fantastic aircraft Nazi Germany really was making towards the end of the war.“They were the only craft that could even approach the performance of objects reported by UFO observers”Captain Edward Ruppelt
In a fit of terrifying creativity, Nazi scientists created the world's first cruise missile, the first long-range ballistic missile, the first artificial object to reach space, one of the first military helicopters, a space shuttle – and started developing nuclear weapons.
British aeronautical engineer Roy Fedden – who led the mission to examine German expertise and research at the end of WW2 – said: "I have seen enough of their designs and production plans to realise that if they had managed to prolong the war some months longer, we would have been confronted with a set of entirely new and deadly developments in air warfare."
But some of the lesser-known planes bear a striking resemblance to flying saucers.
Brothers Reimar and Walter Horten built the world's first jet-powered "flying wing" – an aircraft without tail or fuselage.
The Horten Ho 229 was designed to answer Luftwaffe boss Hermann Göring's call for a bomber designs capable of meeting a "3×1000 requirement" – to carry 1,000kg of bombs a distance of 1,000km at a speed of 1,000kmph.
The US military seized the last Horten prototype as part of Operation Paperclip – a secret mission to captured advanced German weapons research to keep it out of Soviet hands.
The design mysteriously reappeared as the revolutionary B-2 "Stealth Bomber".
Engineer Arthur Sack spent the war trying to perfect an aeroplane with circular wings.
The Sack AS-6 finally became airborne in 1944 – just before the end of the war.
Photographs of the just-plain-weird plane survive – but the prototype mysteriously disappeared when American troops overran the Brandis air base, where it was stored, in April 1945.
Eugen Sänger and Irene Bredt designed the Silbervogel spaceplane for the 1942 "Amerika Bomber" mission to attack the mainland US.
The sub-orbital bomber – a precursor to the Space Shuttle – would be shot into space with a rocket booster and then "bounce" off the atmosphere.
The Arado E.555 was another "flying wing" design put forward for the Amerika Bomber mission.
But perhaps the most revolutionary – and most mystifying – Nazi UFO was Viktor Schauberger's "Repulsine" engine.
The Austrian inventor developed a round turbine engine that could create a vortex and rise straight upwards.
The SS captured Schauberger and made him try to turn the engine into a vertical takeoff aircraft – which looked exactly like a flying saucer.
The prototype crashed – but the research was said to be continued by a shadowy V2 rocket engineer called Dr Heinrich Richard Miethe. source:.dailystar
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