Before constructing their Horten 2-29 replica in late 2008, aerospace engineers from Northrop Grumman examined this craft. The only surviving example of Hitler's stealth fighter, this Ho 2-29 has rested, largely untouched, in a U.S government facility outside Washington, D.C., for more than 50 years.
Among other things, the team, using portable radar equipment, discovered that
"they put some kind of carbon-type material in between the layers of plywood on the plane's leading edges," said Tom Dobrenz, a Northrop Grumman expert in stealth, or "low observable," technology, who led the Horten replica project.
"Personally, I cannot understand that being for anything other than doing something to [defeat] radar."
Photograph by Mark Avino/National Air and Space Museum, Smithsonian Institution