It wasn't really stealth but a first effort. It reduced the radar print by about 20% if memory serves . The big thing was that it was moving 600 mph so by the time the Brits figured out what it was it would have been too late. They only had one and it crashed because of an engine flame out, not faulty flight characteristics. They were building a larger transcontinental bomber version to hit the US with. They wanted it because they were certain of having an operational A bomb in 1946. The Russians also had incredible aircraft designers but Stalin hated flying and always put aircraft on the back burner, sent them to Siberia in fact until he decided he needed them and brought them back. The Allies were very lucky to win WW2, if Hitler wasn't such a fruitcake he could have pulled it off. All the German tech was far ahead of anything we ever dreamed possible.