Whilst launching a few V-2s from submersibles would have achieved very little in the end (the rockets couldn't be aimed very well), the Nazis did have a plan to drop a much greater tonnage of explosives on American targets with much more precision - a stealth bomber. Using this highly advanced technology, the attacks would have been more than merely psychological warfare. And a stealth bomber entering US airspace could have proven a lot harder to detect and stop than U-Boats sailing into US waters. The plane that could have posed severe difficulties for Allied aerial defences was Reimar Horten's Ho 229. This futuristic aircraft was the first flying wing to use jet engines and the only plane to come close to meeting Luftwaffen Reichsmarschall Hermann Göring's "3 x 1000" performance requirements. The extraordinary specifications demanded by Göring were for a plane that could carry 1,000 kg of bombs a distance of 1,000 km with a speed of 1,000 km per hour. The Ho 229 wasn't only fast, able to carry a big payload, and capable of covering long distances, it featured an amazing stealth feature designed to befuddle Britain's Chain Home radar early warning system. Horten mixed charcoal dust into the plane's wood glue to absorb the radar system's electromagnetic waves! Not only that, because the plane was a flying wing, it had less surface area to be picked up by the radar. Even if the radar system had detected the plane's approach, the unusual signature may not have been correctly identified. And that edge would have given the plane the chance to bomb the radar installations into oblivion, leaving Britain open to attack. When a replica of the Ho 229 was tested for its stealth capabilities in a 2008 documentary produced by the National Geographic Channel, the results showed that the plane was indeed less visible on the British-style of radar used at the time. About 20% less visible, to be exact. The British would have had about two and a half minutes to respond to the plane's high-speed attack - and that just wouldn't have been long enough. Thank God the Ho 229 wasn't ready soon enough to be thrown at the British. On a cheerier note, the stealthy bomber would have done less well against American-style radar, which worked differently.