Hitler's secret weapon unveiled

Hitler's secret weapon that could have made Nazi bomber planes invisible to Allied forces has been unveiled for the first time.

The stealth fighter-bomber, named the Horten 229, closely resembles the US Air Force's current B2 bomber and was estimated to be about 20 years ahead of Germany's rivals in terms of stealth technology.

But the Nazis didn't have time to put the "flying wing" into mass production before their surrender in 1945.

American forces held onto the aircraft's prototypes and equipment — and the makers of the B2 Northrop Grumman Corp have now replicated the design for a documentary.

"This was the most advanced technology that the Germans had at the end of the war, and Northrop solved the question of how stealthy it was and its performance against Allied radar at the time," Fox News reported documentary maker Mike Jorgenson as saying.

"It's significantly better than anything flying operationally probably until the 1960s."

Researchers believe the Ho 229's stealth capabilities would have allowed it to appear invisible to British Royal Air Force radars if it were to fly a few dozen feet from ground level.