It's the YB-49. It was a very early flying wing design with some very advanced concepts never put into production.
The Northrop YB-49 was the jet-propelled variant of the company's XB-35 bomber. Eight Allison J35 engines, each delivering 3,750 pounds of thrust, gave the flying wing a top speed of 510 mph, or more than 100 mph faster than its prop-driven predecessor. Flight testing revealed stability problems which could not be corrected with existing technology. The second aircraft crashed on June 5, 1948, killing its five-man crew. Edwards AFB was subsequently named for one of its crew members, Capt. Glen W. Edwards. The YB-49 was the "wrong plane at the wrong time," getting trapped in the transition between propeller-driven and jet-powered aircraft. The program was canceled by the Air Force in 1949.
The Northrop Corp. proposed a modification to the YB-49 Flying Wing bomber , called the YRB-49A. Although its small radar signature had been noticed during tests during the late 1940s, it was the YB-49’s high altitude and long-range flying abilities that gave it consideration as a spy plane. The plane promised a 400-mph cruise speed at 35,000 feet. (It was during a 1948 test flight of the YB-49 that whom Edwards Air Force Base is named, was killed with his four crew Capt. Glen Edwards, for members.)
